50 research outputs found
Π Π°ΡΡΠ΅Ρ Π³ΡΠ°Π½ΠΈΡ ΠΈΠ·ΠΎΠΌΠΎΡΡΠ½ΠΎΠΉ ΡΠΌΠ΅ΡΠΈΠΌΠΎΡΡΠΈ Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ Ln3[M]2M3O12 - Ln3[Sc]2M3O12 (Ln = La-Lu,Y; M = Ga, Al)
The method of solid solution calculation in the system Ln3[Π2]M3O12 - Ln3[ScyΠ2-y]M3O12 (Ln = La-Lu, Y; Π = Ga, Al) has been developed. The theoretical model has been confirmed by experimental data.Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½ ΡΠΏΠΎΡΠΎΠ± ΡΠ°ΡΡΠ΅ΡΠ° Π³ΡΠ°Π½ΠΈΡ ΡΠ²Π΅ΡΠ΄ΠΎΠ³ΠΎ ΡΠ°ΡΡΠ²ΠΎΡΠ° Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ Ln3[Π2]M3O12 β Ln3[ScyΠ2-y]M3O12 (Ln = La β Lu, Y; Π = Ga, Al), ΡΠ°Π±ΠΎΡΠΎΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΡ ΠΊΠΎΡΠΎΡΠΎΠ³ΠΎ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½Π° ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠΌΠΈ Π΄Π°Π½Π½ΡΠΌΠΈ
ΠΡΠΎΠ±Π»Π΅ΠΌΡ Π²ΡΡΠ°ΡΠΈΠ²Π°Π½ΠΈΡ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² Π»Π°Π½Π³Π°ΡΠΈΡΠ° ΠΈ ΠΏΡΡΠΈ ΠΈΡ ΡΠ΅ΡΠ΅Π½ΠΈΡ
The problems of Langasite single crystals growth by Czochralski and Bridgman methods were analyzed. It was found that the deferent kinds of defects in langasite crystals influence on physical properties and thus on langasite crystals application. Vernel method was first proposed for obtaining of qualitative single crystal charge from initial components. A monophase single crystal charge obtaining was confirmed by X-ray diffraction method. A single crystal with uniform composition was obtained by Czochralski method from this chargeΠΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ, Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡΠΈΠ΅ ΠΏΡΠΈ Π²ΡΡΠ°ΡΠΈΠ²Π°Π½ΠΈΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² Π»Π°Π½Π³Π°ΡΠΈΡΠ° ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Π§ΠΎΡ
ΡΠ°Π»ΡΡΠΊΠΎΠ³ΠΎ ΠΈ ΠΡΠΈΠ΄ΠΆΠΌΠ΅Π½Π°. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π½Π° ΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° Π»Π°Π½Π³Π°ΡΠΈΡΠ°, Π»Π΅ΠΆΠ°ΡΠΈΠ΅ Π² ΠΎΡΠ½ΠΎΠ²Π΅ Π΅Π³ΠΎ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ, ΠΎΠΊΠ°Π·ΡΠ²Π°ΡΡ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠ΅ Π²ΠΈΠ΄Ρ Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ². ΠΠΏΠ΅ΡΠ²ΡΠ΅ ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ ΠΈ ΡΠ΅Π°Π»ΠΈΠ·ΠΎΠ²Π°Π½ ΠΌΠ΅ΡΠΎΠ΄ ΠΠ΅ΡΠ½Π΅ΠΉΠ»Ρ, ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°ΡΡΠΈΠΉ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΠ΅ ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ, Π½Π΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠ΅ΠΉ Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ², ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡ
ΡΡ, ΠΈΠ· ΠΊΠΎΡΠΎΡΠΎΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π§ΠΎΡ
ΡΠ°Π»ΡΡΠΊΠΎΠ³ΠΎ Π²ΡΡΠ°ΡΠ΅Π½ ΠΎΠ΄Π½ΠΎΡΠΎΠ΄Π½ΡΠΉ ΠΏΠΎ ΡΠΎΡΡΠ°Π²Ρ ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π» Π»Π°Π½Π³Π°ΡΠΈΡΠ°, ΡΡΠΎ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½ΠΎ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈ
ΠΠ»ΠΈΡΠ½ΠΈΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΠΉ ΡΠΎΡΡΠ° ΠΈ ΠΏΠΎΡΠ»Π΅ΡΠΎΡΡΠΎΠ²ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ Π½Π° ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² Π»Π°Π½Π³Π°ΡΠΈΡΠ°
The effects of the following factors on the optical properties of langasite crystals was studied: the growth direction for crystals of stoichiometric composition (La3Ga5SiO14) obtained in a growth atmosphere Ar+O2; growth atmosphere (Ar and Ar+O2) for crystals of stoichiometric composition; initial composition of crystals for the crystals obtained during the same conditions of growing and post-growth treatment (annealing in vacuum and in air, UV- and Ξ³ - irradiation).Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ( ΠΈ ) ΠΈ Π°ΡΠΌΠΎΡΡΠ΅ΡΡ ΡΠΎΡΡΠ° (Ar ΠΈ Ar+O2), ΡΡΠ»ΠΎΠ²ΠΈΠΉ ΠΏΠΎΡΠ»Π΅ΡΠΎΡΡΠΎΠ²ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ (ΠΎΡΠΆΠΈΠ³ Π² Π²Π°ΠΊΡΡΠΌΠ΅ ΠΈ Π½Π° Π²ΠΎΠ·Π΄ΡΡ
Π΅, Π£Π€- ΠΈ Ξ³ - ΠΎΠ±Π»ΡΡΠ΅Π½ΠΈΠ΅) Π½Π° ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² Π»Π°Π½Π³Π°ΡΠΈΡΠ°
ΠΠΎΠ»ΠΈΡΠ»Π΅ΠΊΡΡΠΎΠ»ΠΈΡΠ½ΡΠ΅ ΠΌΠΈΠΊΡΠΎΠΊΠ°ΠΏΡΡΠ»Ρ, ΠΌΠΎΠ΄ΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ Π½Π°Π½ΠΎΡΠ°Π·ΠΌΠ΅ΡΠ½ΡΠΌ Π΄ΠΈΠΎΠΊΡΠΈΠ΄ΠΎΠΌ ΡΠΈΡΠ°Π½Π°, Π΄Π»Ρ Π°Π΄ΡΠ΅ΡΠ½ΠΎΠΉ Π΄ΠΎΡΡΠ°Π²ΠΊΠΈ Π»Π΅ΠΊΠ°ΡΡΡΠ²Π΅Π½Π½ΡΡ ΡΡΠ΅Π΄ΡΡΠ²
Polyelectrolyte microcapsules composed of CaCO3-core and shell polydiallyldimethylammonium polistirolsufonatpolystyrenesulfonate, were obtained by Layer-by-Layer-method. They were modified with nanoscale titanium dioxide with rutile structure and commercial Degussa P25 and Hombikat UV-100. Besides it has been shown that the sample Hombikat UV-100 is better included in the capsule shell because of a largerspecific surface area and the presence of hydrated component in composition of sample. Resistance to UVradiation was tested on the capsules modified with Degussa P25. It has been established that the modification takes place only in the case of "thick" shells with the number of bilayers being x=8. In the case of shells with x=4 there is a destruction of polyelectrolyte capsules during modification. It has been found that the degree of modification of capsules by nanosizedtitanium dioxide depends on the shell thickness (value x) as well as on the surface of nanoscale titanium dioxide samplesΠΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΏΠΎΡΠ»ΠΎΠΉΠ½ΠΎΠΉ Π°Π΄ΡΠΎΡΠ±ΡΠΈΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ ΠΏΠΎΠ»ΠΈΡΠ»Π΅ΠΊΡΡΠΎΠ»ΠΈΡΠ½ΡΠ΅ ΠΌΠΈΠΊΡΠΎΠΊΠ°ΠΏΡΡΠ»Ρ, ΡΠΎΡΡΠΎΡΡΠΈΠ΅ ΠΈΠ· CaCO3-ΡΠ΄ΡΠ° ΠΈ ΠΏΠΎΠ»ΠΈΠ΄ΠΈΠ°Π»Π»ΠΈΠ»Π΄ΠΈΠΌΠ΅ΡΠΈΠ»Π°ΠΌΠΌΠ½ΠΎΠ½ΠΈΠΉ-ΠΏΠΎΠ»ΠΈΡΡΠΈΡΠΎΠ»ΡΡΠ»ΡΡΠΎΠ½Π°ΡΠ½ΠΎΠΉ ΠΎΠ±ΠΎΠ»ΠΎΡΠΊΠΈ, ΠΌΠΎΠ΄ΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Π½Π°Π½ΠΎΡΠ°Π·ΠΌΠ΅ΡΠ½ΡΠΌ Π΄ΠΈΠΎΠΊΡΠΈΠ΄ΠΎΠΌ ΡΠΈΡΠ°Π½Π° ΡΠΎ ΡΡΡΡΠΊΡΡΡΠΎΠΉ ΡΡΡΠΈΠ»Π°, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΊΠΎΠΌΠΌΠ΅ΡΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΎΠ±ΡΠ°Π·ΡΠ°ΠΌΠΈ Degussa P 25 ΠΈ Hombikat UV-100. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΎΠ±ΡΠ°Π·Π΅Ρ Hombikat UV-100 Π²ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² ΠΎΠ±ΠΎΠ»ΠΎΡΠΊΡ ΠΊΠ°ΠΏΡΡΠ»Ρ Π½Π° ΠΏΠΎΡΡΠ΄ΠΎΠΊ Π»ΡΡΡΠ΅, ΠΏΡΠΈΡΠ΅ΠΌ ΠΌΠΈΠΊΡΠΎΠΊΠ°ΠΏΡΡΠ»Ρ Ρ Degussa P 25 ΡΠ°Π·ΡΡΡΠ°ΡΡΡΡ ΠΏΠΎΠ΄ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ΠΌ Π£Π€-ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ, ΡΡΠΎ Π΄Π΅Π»Π°Π΅Ρ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΠΌ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ Π΄Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ Π² Π°Π΄ΡΠ΅ΡΠ½ΠΎΠΉ Π΄ΠΎΡΡΠ°Π²ΠΊΠ΅ Π»Π΅ΠΊΠ°ΡΡΡΠ²
Π‘ΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΠΏΠ°Π»Π»Π°Π΄ΠΈΡ ΠΈ ΠΌΠ΅Π΄ΠΈ Π² ΡΠ²Π΅ΠΆΠ΅ΠΏΡΠΈΠ³ΠΎΡΠΎΠ²Π»Π΅Π½Π½ΠΎΠΌ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠ΅ PdCl2βCuCl2/Ξ³βAl2O3 Π½ΠΈΠ·ΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ ΠΌΠΎΠ½ΠΎΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π°
The EXAFS/XANES, XRD, SEM methods were used for examination of freshly prepared low temperature carbon monoxide oxidation in air catalyst PdCl2-CuCl2/Ξ³-Al2O3 active components states. The Cu2Cl(OH)3 phase with particle size 100-300 nm and tetrachloropalladat particles were identified on Ξ³-Al2O3 surface. According to EXAFS data one of the palladium chloride bonds is longer then another ones. There is no direct interaction between palladium and copper, i.e. there is no common active center including palladium and copper on the Ξ³-Al2O3 surface responsible on the low temperature carbon monoxide oxidation in air.ΠΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΎΠΉ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΏΠΎΠ³Π»ΠΎΡΠ΅Π½ΠΈΡ (EXAFS/XANES), ΠΏΠΎΡΠΎΡΠΊΠΎΠ²ΠΎΠΉ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΎΠΉ Π΄ΠΈΡΡΠ°ΠΊΡΠΎΠΌΠ΅ΡΡΠΈΠΈΠΈ, ΡΠ°ΡΡΡΠΎΠ²ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ (Π ΠΠ) ΠΈΠ·ΡΡΠ΅Π½ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ Π°ΠΊΡΠΈΠ²Π½ΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠΎΠ² ΡΠ²Π΅ΠΆΠ΅ΠΏΡΠΈΠ³ΠΎΡΠΎΠ²Π»Π΅Π½Π½ΠΎΠ³ΠΎ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠ° PdCl2βCuCl2/Ξ³βAl2O3 Π½ΠΈΠ·ΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ ΠΌΠΎΠ½ΠΎΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π° Π² Π²ΠΎΠ·Π΄ΡΡ
Π΅. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ Ξ³βAl2O3 Π½Π°Ρ
ΠΎΠ΄ΠΈΡΡΡ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠ°Ρ ΡΠ°Π·Π° Cu2Cl(OH)3 Ρ ΡΠ°Π·ΠΌΠ΅ΡΠ°ΠΌΠΈ ΡΠ°ΡΡΠΈΡ 100-300 Π½ΠΌ ΠΈ ΠΏΠ°Π»Π»Π°Π΄ΠΈΠΉ Π² Π°ΠΌΠΎΡΡΠ½ΠΎΠΌ ΡΠΎΡΡΠΎΡΠ½ΠΈΠΈ. ΠΠΎ Π΄Π°Π½Π½ΡΠΌ EXAFS, Π»ΠΎΠΊΠ°Π»ΡΠ½ΠΎΠ΅ ΠΎΠΊΡΡΠΆΠ΅Π½ΠΈΠ΅ ΠΏΠ°Π»Π»Π°Π΄ΠΈΡ - ΡΠ΅ΡΡΡΠ΅ Π°ΡΠΎΠΌΠ° Ρ
Π»ΠΎΡΠ°, ΠΎΠ±ΡΠ°Π·ΡΡΡΠΈΠ΅ ΠΏΠ»ΠΎΡΠΊΠΈΠΉ ΠΊΠ²Π°Π΄ΡΠ°Ρ Ρ ΠΎΠ΄Π½ΠΎΠΉ Π±ΠΎΠ»Π΅Π΅ Π΄Π»ΠΈΠ½Π½ΠΎΠΉ ΡΠ²ΡΠ·ΡΡ Pd-Cl. ΠΡΡΠΌΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΠ°ΠΊΡΠ° ΠΌΠ΅ΠΆΠ΄Ρ ΠΏΠ°Π»Π»Π°Π΄ΠΈΠ΅ΠΌ ΠΈ ΠΌΠ΅Π΄ΡΡ Π½Π΅ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΎ, ΡΠΎ Π΅ΡΡΡ, Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΊΠ°ΡΠ°Π»ΠΈΠ·Π°ΡΠΎΡΠ° ΠΎΡΡΡΡΡΡΠ²ΡΠ΅Ρ Π΅Π΄ΠΈΠ½ΡΠΉ Π°ΠΊΡΠΈΠ²Π½ΡΠΉ ΡΠ΅Π½ΡΡ, ΠΎΡΠ²Π΅ΡΡΡΠ²Π΅Π½Π½ΡΠΉ Π·Π° ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΡΠ΅Π°ΠΊΡΠΈΠΈ ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ ΠΌΠΎΠ½ΠΎΠΎΠΊΡΠΈΠ΄Π° ΡΠ³Π»Π΅ΡΠΎΠ΄Π° ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄ΠΎΠΌ
Calculation of the isomorfic mixture limit in the system Ln<sub>3</sub>[M]<sub>2</sub>M<sub>3</sub>O<sub>12</sub> - Ln<sub>3</sub>[Sc]<sub>2</sub>M<sub>3</sub>O<sub>12</sub> (Ln = La-Lu,Y; M = Ga, Al)
The method of solid solution calculation in the system Ln3[Π2]M3O12 - Ln3[ScyΠ2-y]M3O12 (Ln = La-Lu, Y; Π = Ga, Al) has been developed. The theoretical model has been confirmed by experimental data
The problems of Langasite single crystals growth and their solution
The problems of Langasite single crystals growth by Czochralski and Bridgman methods were analyzed. It was found that the deferent kinds of defects in langasite crystals influence on physical properties and thus on langasite crystals application. Vernel method was first proposed for obtaining of qualitative single crystal charge from initial components. A monophase single crystal charge obtaining was confirmed by X-ray diffraction method. A single crystal with uniform composition was obtained by Czochralski method from this charg