In the work by ceramic technology produced samples isotropic and anisotropic polycrystalline hexaferrite
BaFe12O19 and investigated their properties. It is shown that as the permanent magnets can be used
both types of samples, whereas for substrates microstrip microwave devices mm-range expedient to use only
anisotropic polycrystalline hexaferrite BaFe12O19

Chitanov, D.N.

Korolev, Yu.M.

Korovushkin, V.V.

Kostishyn, V.G.

SocioEconomic Challenges Journal (Sumy State University)

JOURNAL OF NANO- AND ELECTRONIC PHYSICS ЖУРНАЛ НАНО- ТА ЕЛЕКТРОННОЇ ФІЗИКИ 
Vol. 7 No 4, 04057(4pp) (2015) Том 7 № 4, 04057(4cc) (2015) 
 
 
2077-6772/2015/7(4)04057(4) 04057-1  2015 Sumy State University 
Obtaining and Properties of Hexaferrite BaFe12O19 for High-coercivity Permanent Magnets 
and Substrates Microstrip Microwave Devices of mm-Range 
 
V.G. Kostishyn1,*, V.V. Korovushkin1, D.N. Chitanov1, Yu.M. Korolev 
 
1 National University of Science and Technology "MISiS", 4, Leninsky Prosp., 119049 Moscow, Russia 
2 Institute of Petrochemical Synthesis of A.V. Topchieva Russian Academy of Sciences,  
29, Leninsky Prosp., 119991 Moscow, Russia 
 
(Received 24 September 2015; published online 24 December 2015) 
 
In the work by ceramic technology produced samples isotropic and anisotropic polycrystalline hexafer-
rite BaFe12O19 and investigated their properties. It is shown that as the permanent magnets can be used 
both types of samples, whereas for substrates microstrip microwave devices mm-range expedient to use on-
ly anisotropic polycrystalline hexaferrite BaFe12O19. 
 
Keywords: Barium hexaferrite, Microwave, Сrystal anisotropy, Сoercive force, Microstructure. 
 
 PACS numbers: 75.50.Gg, 75.75. + a 
 
 
                                                          
*
 drvgkostishyn@mail.ru 
1. INTRODUCTION 
 
Hexagonal ferrites BaFe12O19 have a crystal struc-
ture of magnetoplumbite type [1] and the high values of 
the magnetic anisotropy HK and coercive force HC [2]. 
Availability of of high values of HK and HC allows to 
use these materials as effective permanent magnets [3]. 
The advantage of permanent magnets based on 
BaFe12O19 are able to exercise at them multipolar mag-
netisation on one-piece compact unit and high values of 
operational characteristics in high frequency magnetic 
fields. 
In recent years, due to the high value of HK, the 
polycrystal BaFe12O19 regarded as a perspective mate-
rial for substrate microstrip microwave devices mm-
range [2]. 
The purpose of this work was to obtain and research 
samples of polycrystalline hexaferrite BaFe12O19 for use 
as permanent magnets and substrate microstrip ferrite 
decouplers devices mm-range wavelength. 
 
2. OBTAINING RESEARCH OBJECTS 
 
Method of production objects of the research was to 
obtain a compound of BaO 6Fe2O3 by the solid phase 
reaction between the iron oxide and barium oxide in 
the heat treatment process briquetted raw material 
mixture, in the subsequent grinding briquettes, press-
ing and sintering of parts. The first stage of the process 
- providing a mixture of oxides in the proper propor-
tions of the most performed in a simple way - mechani-
cal mixing iron oxide and barium carbonate salt. The 
powder mixture of iron oxide and barium carbonate 
briquetted and subjected to thermal treatment at 
T  1300 ºC with delay for several hours and subse-
quent quenching in water; during the heat treatment 
resulted in the formation compounds BaO∙6Fe2O3. Bri-
quettes subjected to ball milling in a vibrating mill to a 
finely dispersed state (the particle size of a few mi-
crons). The pressed parts of the powder were sintered 
at temperatures of 1150-1250 ºC. Pressing the powder 
in conventional compression molds results in isotropic 
magnets, pressing in the molds provided with the mag-
netizing device, – to obtain anisotropic, with advanta-
geous properties in the direction of the applied field. In 
this paper we were obtained as isotropic and aniso-
tropic samples. 
On the properties of barium oxide magnets signifi-
cantly affected the percentage of oxides and the pres-
ence of impurities, grain size, the condition of pressing 
and sintering regime; in the manufacture of anisotropic 
magnets is very large role and shape of the particles. 
The composition of the barium ferrite, determined by 
the formula BaO∙6Fe2O3, as follows (in wt. %): BaO – 
13,77, Fe2O3 – 86,23 [4]. 
 
3. METHODS OF EXPERIMENTAL RESEARCH 
 
In order to study characteristics of the crystal and 
magnetic structure using X-ray diffraction, Mossbauer 
spectroscopy, magnetometry and simultaneous thermal 
analysis. 
Magnetic parameters were measured by standard 
methods on vibration magnetometer VSM 250. 
X-ray diffraction studies were performed on the ob-
ject X-ray diffractometer DRON-3M (Russia) and D8 
Advance Bruker AXS (Germany). 
During the X-ray diffraction was used CuKα-
radiation, as well as a tube with an iron anode (work-
ing current – 25 mA, power – 25 kW). Wavelength 
0.193728 nm. When shooting samples used the filter 
Mn. Focusing was performed by the method of Bragg-
Brentano with two slits Soller. Measurements were 
made at room temperature. 
Identification intense peaks in the diffraction pat-
tern was performed using software package PDWin 4.0. 
X-ray diffraction analysis of samples was limited to the 
determination of the series-spacings, and compared 
them with the reference data base of powder diffraction 
data, which is based on the card index PDF2. 
Mossbauer spectrometer studies performed Ms-1104 
Em with automatic processing the spectra of the pro-
gram Univem Ms in the temperature range 87-300 K. 
 
 V.G. KOSTISHYN, V.V. KOROVUSHKIN, ET AL. J. NANO- ELECTRON. PHYS. 7, 04057 (2015) 
 
 
04057-2 
4. THE RESULTS OF EXPERIMENTAL  
RESEARCH 
 
X-ray studies have confirmed that as a result of the 
used technology obtained polycrystalline isotropic and 
anisotropic hexagonal ferrites BaFe12O19. Characteris-
tic X-ray diffraction patterns are presented in Fig. 1 
and 2. 
 
 
 
Fig. 1 – The characteristic X-ray diffraction of the sample of 
polycrystalline isotropic hexaferrite BaFe12O19 
 
 
 
Fig. 2 – The characteristic X-ray diffraction of polycrystalline 
sample anisotropic hexaferrite BaFe12O19 
 
Table 1 shows the values of the basic parameters for 
the isotropic magnetic ferrites of barium IZ-1 and IZ-2 
with an energy of up to 1,25∙106 G∙Oe and anisotropic 
ANIZ-1 and ANIZ-2 with energies up to 3,6∙106 G∙Oe. 
Fig. 3 shows the magnetization curve and hysteresis 
loop to one of the samples ANIZ-2. 
Fig. 4 shows the typical fraktogrammy obtained in 
the isotropic and anisotropic barium hexaferrite. 
Mossbauer spectroscopy was investigated samples 
isotropic and anisotropic hexaferrites BaFe12O19 as 
starting powders, milled from massive plates and rings, 
and in the form of foil at 300 and 87 K. As an example, 
Fig. 5 shows the Mossbauer spectra of isotropic and 
anisotropic barium hexaferrite measured at 300 and 87 K. 
With the program spectra processing «Univem Ms» 
spectra were arranged on 5 sextets. The criterion for 
optimal decomposition served min2, characterizing the 
convergence of the experimental spectrum and the 
results of approximation. Processing of the spectra  
 
 
 
Fig. 3 – The magnetization curve and hysteresis loop for an 
anisotropic sample ANIZ-2 
 
 
 
Fig. 4 – Typical fraktogrammy obtained in the isotropic (a) 
and anisotropic (b) barium hexaferrite 
 
allowed us to estimate the parameters characterizing 
the chemical bond ions Fe3 +-O, local distortions of the 
crystal lattice, the magnetic state of nonequivalent ions 
Fe3 +, the population of the items iron ions over the 
sublattices a, b, c, d and e. Table 2 shows the 
parameters studied hexagonal ferrites BaFe12O19. 
Theoretical occupancy sublattice Fe3 + ions are 
shown in Table 3. The table above shows that iron ions 
Fe3 + in BaFe12O19 localized in five non-equivalent 
positions (sublattice a, b, c, d, e), the population of 
which differs from the theoretical. The difference the 
relative intensity of the component sextet for different 
sublattices of the expected population may be 
associated with different probability of the Mossbauer 
effect for sublattices (a) by the presence of vacancies 
Fe3 + ions in these sublattices [5]. 
The comparison relative intensities of the 
components of the Mossbauer spectra of single crystals 
suggests that within the error of cation vacancies are 
statistically distributed in all positions except 2b (e 
sublattice). Lower values for the probability of the 
Mossbauer effect sublattice (e) due to the specifics of 
the vibrations of iron ions sublattice. According to X-
ray diffraction fivefold-coordinated ions are located not 
only at the center of symmetry of the tetrahedral 
pyramid and its base plane – quadrangle. These 
provisions are separated by distance and 0,156 Å, 
respectively, a potential barrier. At room temperature, 
ion Fe3 + oscillates between these positions, which 
provides a reduced probability of the Mossbauer effect, 
and an abnormally large value of the quadrupole 
splitting (2,17-2,32) mm/s [6]. 
Table 1 - Basic magnetic parameters isotropic barium oxide magnets 
 
The sample type Br, G bHc, Oe (BH)max∙10 – 6, Oe K1∙10 – 6, e/cm3 , Ω∙cm Density, g/cm3 
IZ-1 
IZ-2 
1800-2100 
1900-2100 
1600-1400 
1800-1600 
0,8-0,9 
0,9-1,25 
1,2 
1,5 
1,2∙107 
1∙107 
4,4-4,6 
4,6-4,7 
ANIZ-1 
ANIZ-2 
3200-3500 
3600-4000 
2700-2300 
2200-1600 
2,0-2,8 
3,0-3,6 
3,5 
3,7 
7∙106 
8∙106 
4,5-4,8 
4,8-4,9 
 OBTAINING AND PROPERTIES OF HEXAFERRITE BAFE12O19… J. NANO- ELECTRON. PHYS. 7, 04057 (2015) 
 
 
04057-3 
 
   
 
Fig. 5 – Mossbauer spectra of hexagonal ferrites BaFe12O19: a – isotropic (300 K); b – anisotropic (300 K); c – isotropic (87 C);  
d – anisotropic (87 K) 
 
Table 2 – Mossbauer research parameters of isotropic and anisotropic hexagonal ferrites BaFe12O19 at 300 and 87 K 
 
 
Sample, tempera-
ture K, kind of 
material, Тс 
Sublattice compo-
nent spectrum 
The 
isomer 
shift, , 
mm/s 
Quadrupole 
splitting , 
mm/s 
The mag-
netic fields 
at the nu-
clei, Fe57 H, 
kOe 
Squares 
componen 
t, S, %. 
∑Sbcd/Sa, 
fa/fbcd 
Se/∑Sbcd, 
fe/fbcd 
Isotropic, 
300 K, No 1 
powder 
Тс  601 K 
а-С1(Fe3+)VI 0,35 0,42 414 49,9 0.92 0.57 
b-C4(Fe3+)VI 0,33 0,00 507 8,8 
c-C3(Fe3+)IV 0,26 0,22 491 18,6 
d-C2(Fe3+)VI 0,39 0,20 516 17,6 
e-C5(Fe3+)V 0,29 2,21 400 5,1 
Anisotropic, 300 K, 
powder 
Тс  720 K 
а-С1(Fe3+)VI 0,35 0,41 414 47,7 0.85 0.61 
b-C4(Fe3+)VI 0,32 0,02 506 7,8 
c-C3(Fe3+)IV 0,26 0,21 488 19,4 
d-C2(Fe3+)VI 0,39 0,18 514 19,4 
e-C5(Fe3+)V 0,28 2,17 403 5,7 
Isotropic, 
90 K, 
powder 
 
а-С1(Fe3+)VI 0,47 0,43 508 50,0 0.94 0.65 
b-C4(Fe3+)VI 0,44 0,08 539 9,6 
c-C3(Fe3+)IV 0,33 0,15 519 17,8 
d-C2(Fe3+)VI 0,49 0,21 546 16,8 
e-C5(Fe3+)V 0,37 2,32 427 5,8 
Anisotropic, 90 K, 
powder 
 
а-С1(Fe3+)VI 0,47 0,42 507 50,2 0.94 0.61 
b-C4(Fe3+)VI 0,40 0,11 533 8,2 
c-C3(Fe3+)IV 0,34 0,12 516 17,2 
d-C2(Fe3+)VI 0,48 0,21 544 19,0 
e-C5(Fe3+)V 0,35 2,28 431 5,4 
Isotropic, 
300 K, No 2 
powder 
 
а-С1(Fe3+)VI 0,35 0,42 414 49,5   
b-C4(Fe3+)VI 0,33 0,0 507 9,1 
c-C3(Fe3+)IV 0,26 0,22 491 18,7 
d-C2(Fe3+)VI 0,39 0,20 516 17,6 
e-C5(Fe3+)V 0,29 2,21 400 5,1 
Isotropic, 
powder, 
Тс  722 K 
а-С1(Fe3+)VI 0,35 0,41 409 49,4   
b-C4(Fe3+)VI 0,31 0,01 502 9,8 
c-C3(Fe3+)IV 0,26 0,21 487 17,7 
d-C2(Fe3+)VI 0,39 0,17 412 17,8 
e-C5(Fe3+)V 0,28 2,19 399 5,3 
 
 
 
 
 
 
 V.G. KOSTISHYN, V.V. KOROVUSHKIN, ET AL. J. NANO- ELECTRON. PHYS. 7, 04057 (2015) 
 
 
04057-4 
Table 3 – The occupancy position iron ions in the structure of Me2+Fe12O19 
 
Sublattice The number 
of ions in the 
el. cell 
Theoretical squares 
sextets by Fe3+ ions 
Encirclement The coordination 
number 
The direction of 
spin 
2a(b) 2 8,3 octa (S) 6 up 
4f1(c) 4 16,7 tetra (S) 4 down 
12k(a) 12 50 octa (RS) 6 up 
4f2(d) 4 16,7 octa (R) 6 down 
2b(e) 2 8,3 bipyramid (R) 5 up 
 
5. CONCLUSION 
 
The work by ceramic technology obtained samples 
isotropic and anisotropic hexagonal ferrite BaFe12O19 
and studied their properties.  
It is established that the samples in powder 
characteristics Mossbauer isotropic and anisotropic 
ferrite differ slightly. 
Analysis of magnetic sampling parameters allows to 
conclude that as the permanent magnets can be used as 
isotropic and anisotropic ferrite BaFe12O19. For 
substrates microstrip microwave devices mm-range use 
of an isotropic ferrite BaFe12O19 - is impractical due to 
the small value of the magnetic anisotropy. 
 
Work is executed in NUST "MISIS" with the financial 
support of the Ministry of Education of the Russian 
Federation within the grant agreement № 14.575.21.0030 
on 27 June 2014 (RFMEFI57514X0030). 
 
 
REFERENCES 
 
1. V.N. Antsiferov, L.M. Letyuk, V.G. Andreev, A.N. Dubrov, 
A.V. Gonchar, V.G. Kostishyn, A.I. Satin, The problems-we 
Powder Materials. H IV / Materials polycrystalline ferrites 
(Ekaterinburg: UB RAS: 2004). 
2. L.M. Letyuk, V.G. Kostishin, A.V. Gonchar, Technology 
magnetoelectronic ferrite materials (M.: MISA: 2005). 
3. Permanent magnets: A Handbook (Ed. Y.M. Pyatina)  
(M.: Energia, 1980). 
4. B.E. Levin, Y.D. Tretyakov, L.M. Letyuk, Physical and 
chemical bases of reception, properties and applications of 
ferrites (M.: Metallurgy: 1979). 
5. V.I. Archarov, V.P. Pashchenko, Math. USSR Academy 
Sci., Ser. Inorg. Mater. 11 No 9, 2022 (1977). 
6. Yu.A. Mamaluy, L.P. Ol’khovik, L.F. Checherskaya, Ukr. 
J. Phys. 27 No 9, 1396 (1982). 
 


Obtaining and Properties of Hexaferrite BaFe12O19 for High-coercivity Permanent Magnets and Substrates Microstrip Microwave Devices of mm-Range

Electronic Sumy State University Institutional Repository

JOURNAL OF NANO- AND ELECTRONIC PHYSICS ЖУРНАЛ НАНО- ТА ЕЛЕКТРОННОЇ ФІЗИКИ Vol. 7 No 4, 04057(4pp) (2015) Том 7 № 4, 04057(4cc) (2015)   2077-6772/2015/7(4)04057(4) 04057-1  2015 Sumy State University Obtaining and Properties of Hexaferrite BaFe12O19 for High-coercivity Permanent Magnets and Substrates Microstrip Microwave Devices of mm-Range  V.G. Kostishyn1,*, V.V. Korovushkin1, D.N. Chitanov1, Yu.M. Korolev  1 National University of Science and Technology "MISiS", 4, Leninsky Prosp., 119049 Moscow, Russia 2 Institute of Petrochemical Synthesis of A.V. Topchieva Russian Academy of Sciences,  29, Leninsky Prosp., 119991 Moscow, Russia  (Received 24 September 2015; published online 24 December 2015)  In the work by ceramic technology produced samples isotropic and anisotropic polycrystalline hexafer-rite BaFe12O19 and investigated their properties. It is shown that as the permanent magnets can be used both types of samples, whereas for substrates microstrip microwave devices mm-range expedient to use on-ly anisotropic polycrystalline hexaferrite BaFe12O19.  Keywords: Barium hexaferrite, Microwave, Сrystal anisotropy, Сoercive force, Microstructure.   PACS numbers: 75.50.Gg, 75.75. + a                                                             * drvgkostishyn@mail.ru 1. INTRODUCTION  Hexagonal ferrites BaFe12O19 have a crystal struc-ture of magnetoplumbite type [1] and the high values of the magnetic anisotropy HK and coercive force HC [2]. Availability of of high values of HK and HC allows to use these materials as effective permanent magnets [3]. The advantage of permanent magnets based on BaFe12O19 are able to exercise at them multipolar mag-netisation on one-piece compact unit and high values of operational characteristics in high frequency magnetic fields. In recent years, due to the high value of HK, the polycrystal BaFe12O19 regarded as a perspective mate-rial for substrate microstrip microwave devices mm-range [2]. The purpose of this work was to obtain and research samples of polycrystalline hexaferrite BaFe12O19 for use as permanent magnets and substrate microstrip ferrite decouplers devices mm-range wavelength.  2. OBTAINING RESEARCH OBJECTS  Method of production objects of the research was to obtain a compound of BaO 6Fe2O3 by the solid phase reaction between the iron oxide and barium oxide in the heat treatment process briquetted raw material mixture, in the subsequent grinding briquettes, press-ing and sintering of parts. The first stage of the process - providing a mixture of oxides in the proper propor-tions of the most performed in a simple way - mechani-cal mixing iron oxide and barium carbonate salt. The powder mixture of iron oxide and barium carbonate briquetted and subjected to thermal treatment at T  1300 ºC with delay for several hours and subse-quent quenching in water; during the heat treatment resulted in the formation compounds BaO∙6Fe2O3. Bri-quettes subjected to ball milling in a vibrating mill to a finely dispersed state (the particle size of a few mi-crons). The pressed parts of the powder were sintered at temperatures of 1150-1250 ºC. Pressing the powder in conventional compression molds results in isotropic magnets, pressing in the molds provided with the mag-netizing device, – to obtain anisotropic, with advanta-geous properties in the direction of the applied field. In this paper we were obtained as isotropic and aniso-tropic samples. On the properties of barium oxide magnets signifi-cantly affected the percentage of oxides and the pres-ence of impurities, grain size, the condition of pressing and sintering regime; in the manufacture of anisotropic magnets is very large role and shape of the particles. The composition of the barium ferrite, determined by the formula BaO∙6Fe2O3, as follows (in wt. %): BaO – 13,77, Fe2O3 – 86,23 [4].  3. METHODS OF EXPERIMENTAL RESEARCH  In order to study characteristics of the crystal and magnetic structure using X-ray diffraction, Mossbauer spectroscopy, magnetometry and simultaneous thermal analysis. Magnetic parameters were measured by standard methods on vibration magnetometer VSM 250. X-ray diffraction studies were performed on the ob-ject X-ray diffractometer DRON-3M (Russia) and D8 Advance Bruker AXS (Germany). During the X-ray diffraction was used CuKα-radiation, as well as a tube with an iron anode (work-ing current – 25 mA, power – 25 kW). Wavelength 0.193728 nm. When shooting samples used the filter Mn. Focusing was performed by the method of Bragg-Brentano with two slits Soller. Measurements were made at room temperature. Identification intense peaks in the diffraction pat-tern was performed using software package PDWin 4.0. X-ray diffraction analysis of samples was limited to the determination of the series-spacings, and compared them with the reference data base of powder diffraction data, which is based on the card index PDF2. Mossbauer spectrometer studies performed Ms-1104 Em with automatic processing the spectra of the pro-gram Univem Ms in the temperature range 87-300 K.   V.G. KOSTISHYN, V.V. KOROVUSHKIN, ET AL. J. NANO- ELECTRON. PHYS. 7, 04057 (2015)   04057-2 4. THE RESULTS OF EXPERIMENTAL  RESEARCH  X-ray studies have confirmed that as a result of the used technology obtained polycrystalline isotropic and anisotropic hexagonal ferrites BaFe12O19. Characteris-tic X-ray diffraction patterns are presented in Fig. 1 and 2.    Fig. 1 – The characteristic X-ray diffraction of the sample of polycrystalline isotropic hexaferrite BaFe12O19    Fig. 2 – The characteristic X-ray diffraction of polycrystalline sample anisotropic hexaferrite BaFe12O19  Table 1 shows the values of the basic parameters for the isotropic magnetic ferrites of barium IZ-1 and IZ-2 with an energy of up to 1,25∙106 G∙Oe and anisotropic ANIZ-1 and ANIZ-2 with energies up to 3,6∙106 G∙Oe. Fig. 3 shows the magnetization curve and hysteresis loop to one of the samples ANIZ-2. Fig. 4 shows the typical fraktogrammy obtained in the isotropic and anisotropic barium hexaferrite. Mossbauer spectroscopy was investigated samples isotropic and anisotropic hexaferrites BaFe12O19 as starting powders, milled from massive plates and rings, and in the form of foil at 300 and 87 K. As an example, Fig. 5 shows the Mossbauer spectra of isotropic and anisotropic barium hexaferrite measured at 300 and 87 K. With the program spectra processing «Univem Ms» spectra were arranged on 5 sextets. The criterion for optimal decomposition served min2, characterizing the convergence of the experimental spectrum and the results of approximation. Processing of the spectra     Fig. 3 – The magnetization curve and hysteresis loop for an anisotropic sample ANIZ-2    Fig. 4 – Typical fraktogrammy obtained in the isotropic (a) and anisotropic (b) barium hexaferrite  allowed us to estimate the parameters characterizing the chemical bond ions Fe3 +-O, local distortions of the crystal lattice, the magnetic state of nonequivalent ions Fe3 +, the population of the items iron ions over the sublattices a, b, c, d and e. Table 2 shows the parameters studied hexagonal ferrites BaFe12O19. Theoretical occupancy sublattice Fe3 + ions are shown in Table 3. The table above shows that iron ions Fe3 + in BaFe12O19 localized in five non-equivalent positions (sublattice a, b, c, d, e), the population of which differs from the theoretical. The difference the relative intensity of the component sextet for different sublattices of the expected population may be associated with different probability of the Mossbauer effect for sublattices (a) by the presence of vacancies Fe3 + ions in these sublattices [5]. The comparison relative intensities of the components of the Mossbauer spectra of single crystals suggests that within the error of cation vacancies are statistically distributed in all positions except 2b (e sublattice). Lower values for the probability of the Mossbauer effect sublattice (e) due to the specifics of the vibrations of iron ions sublattice. According to X-ray diffraction fivefold-coordinated ions are located not only at the center of symmetry of the tetrahedral pyramid and its base plane – quadrangle. These provisions are separated by distance and 0,156 Å, respectively, a potential barrier. At room temperature, ion Fe3 + oscillates between these positions, which provides a reduced probability of the Mossbauer effect, and an abnormally large value of the quadrupole splitting (2,17-2,32) mm/s [6]. Table 1 - Basic magnetic parameters isotropic barium oxide magnets  The sample type Br, G bHc, Oe (BH)max∙10 – 6, Oe K1∙10 – 6, e/cm3 , Ω∙cm Density, g/cm3 IZ-1 IZ-2 1800-2100 1900-2100 1600-1400 1800-1600 0,8-0,9 0,9-1,25 1,2 1,5 1,2∙107 1∙107 4,4-4,6 4,6-4,7 ANIZ-1 ANIZ-2 3200-3500 3600-4000 2700-2300 2200-1600 2,0-2,8 3,0-3,6 3,5 3,7 7∙106 8∙106 4,5-4,8 4,8-4,9  OBTAINING AND PROPERTIES OF HEXAFERRITE BAFE12O19… J. NANO- ELECTRON. PHYS. 7, 04057 (2015)   04057-3      Fig. 5 – Mossbauer spectra of hexagonal ferrites BaFe12O19: a – isotropic (300 K); b – anisotropic (300 K); c – isotropic (87 C);  d – anisotropic (87 K)  Table 2 – Mossbauer research parameters of isotropic and anisotropic hexagonal ferrites BaFe12O19 at 300 and 87 K   Sample, tempera-ture K, kind of material, Тс Sublattice compo-nent spectrum The isomer shift, , mm/s Quadrupole splitting , mm/s The mag-netic fields at the nu-clei, Fe57 H, kOe Squares componen t, S, %. ∑Sbcd/Sa, fa/fbcd Se/∑Sbcd, fe/fbcd Isotropic, 300 K, No 1 powder Тс  601 K а-С1(Fe3+)VI 0,35 0,42 414 49,9 0.92 0.57 b-C4(Fe3+)VI 0,33 0,00 507 8,8 c-C3(Fe3+)IV 0,26 0,22 491 18,6 d-C2(Fe3+)VI 0,39 0,20 516 17,6 e-C5(Fe3+)V 0,29 2,21 400 5,1 Anisotropic, 300 K, powder Тс  720 K а-С1(Fe3+)VI 0,35 0,41 414 47,7 0.85 0.61 b-C4(Fe3+)VI 0,32 0,02 506 7,8 c-C3(Fe3+)IV 0,26 0,21 488 19,4 d-C2(Fe3+)VI 0,39 0,18 514 19,4 e-C5(Fe3+)V 0,28 2,17 403 5,7 Isotropic, 90 K, powder  а-С1(Fe3+)VI 0,47 0,43 508 50,0 0.94 0.65 b-C4(Fe3+)VI 0,44 0,08 539 9,6 c-C3(Fe3+)IV 0,33 0,15 519 17,8 d-C2(Fe3+)VI 0,49 0,21 546 16,8 e-C5(Fe3+)V 0,37 2,32 427 5,8 Anisotropic, 90 K, powder  а-С1(Fe3+)VI 0,47 0,42 507 50,2 0.94 0.61 b-C4(Fe3+)VI 0,40 0,11 533 8,2 c-C3(Fe3+)IV 0,34 0,12 516 17,2 d-C2(Fe3+)VI 0,48 0,21 544 19,0 e-C5(Fe3+)V 0,35 2,28 431 5,4 Isotropic, 300 K, No 2 powder  а-С1(Fe3+)VI 0,35 0,42 414 49,5   b-C4(Fe3+)VI 0,33 0,0 507 9,1 c-C3(Fe3+)IV 0,26 0,22 491 18,7 d-C2(Fe3+)VI 0,39 0,20 516 17,6 e-C5(Fe3+)V 0,29 2,21 400 5,1 Isotropic, powder, Тс  722 K а-С1(Fe3+)VI 0,35 0,41 409 49,4   b-C4(Fe3+)VI 0,31 0,01 502 9,8 c-C3(Fe3+)IV 0,26 0,21 487 17,7 d-C2(Fe3+)VI 0,39 0,17 412 17,8 e-C5(Fe3+)V 0,28 2,19 399 5,3        V.G. KOSTISHYN, V.V. KOROVUSHKIN, ET AL. J. NANO- ELECTRON. PHYS. 7, 04057 (2015)   04057-4 Table 3 – The occupancy position iron ions in the structure of Me2+Fe12O19  Sublattice The number of ions in the el. cell Theoretical squares sextets by Fe3+ ions Encirclement The coordination number The direction of spin 2a(b) 2 8,3 octa (S) 6 up 4f1(c) 4 16,7 tetra (S) 4 down 12k(a) 12 50 octa (RS) 6 up 4f2(d) 4 16,7 octa (R) 6 down 2b(e) 2 8,3 bipyramid (R) 5 up  5. CONCLUSION  The work by ceramic technology obtained samples isotropic and anisotropic hexagonal ferrite BaFe12O19 and studied their properties.  It is established that the samples in powder characteristics Mossbauer isotropic and anisotropic ferrite differ slightly. Analysis of magnetic sampling parameters allows to conclude that as the permanent magnets can be used as isotropic and anisotropic ferrite BaFe12O19. For substrates microstrip microwave devices mm-range use of an isotropic ferrite BaFe12O19 - is impractical due to the small value of the magnetic anisotropy.  Work is executed in NUST "MISIS" with the financial support of the Ministry of Education of the Russian Federation within the grant agreement № 14.575.21.0030 on 27 June 2014 (RFMEFI57514X0030).   REFERENCES  1. V.N. Antsiferov, L.M. Letyuk, V.G. Andreev, A.N. Dubrov, A.V. Gonchar, V.G. Kostishyn, A.I. Satin, The problems-we Powder Materials. H IV / Materials polycrystalline ferrites (Ekaterinburg: UB RAS: 2004). 2. L.M. Letyuk, V.G. Kostishin, A.V. Gonchar, Technology magnetoelectronic ferrite materials (M.: MISA: 2005). 3. Permanent magnets: A Handbook (Ed. Y.M. Pyatina)  (M.: Energia, 1980). 4. B.E. Levin, Y.D. Tretyakov, L.M. Letyuk, Physical and chemical bases of reception, properties and applications of ferrites (M.: Metallurgy: 1979). 5. V.I. Archarov, V.P. Pashchenko, Math. USSR Academy Sci., Ser. Inorg. Mater. 11 No 9, 2022 (1977). 6. Yu.A. Mamaluy, L.P. Ol’khovik, L.F. Checherskaya, Ukr. J. Phys. 27 No 9, 1396 (1982).  

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Obtaining and Properties of Hexaferrite BaFe12O19 for High-coercivity Permanent Magnets and Substrates Microstrip Microwave Devices of mm-Range

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