49 research outputs found
Crystal Growth and Structure Determination of Pigment Orange 82
The crystal structure of the important industrial orangepigment PO82, major part of the BASF Colors amp; Effects productSicopal Orange K L 2430, was solved from combined X ray singlecrystal, X ray and neutron powder diffraction,119Sn MΓΆssbauer spec troscopy, transmission electron microscopy, electron diffraction, andchemical analyses. The structure contains Keggin type clusters com posed of four [M3O13] trimers consisting each of three MO6 octahedra that share edges and one common oxygen atom connecting the trimersto the central ZnO4tetrahedron. The octahedrally coordinated metalatom position is mixed occupied by Ti4 ,Sn4 , and Zn2 . AdjacentKeggin clusters share vertices and are further interconnected to fourZnO4tetrahedra. This framework of interconnectedMO6octahedra andZnO4tetrahedra contains channels along [110], in which the Sn2 cat ions are locate
ΠΡΠ΅Π½ΠΊΠ° ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΡΠ΅ΡΠΌΠΎΠΌΠ°Π³Π½ΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ ΡΠ²Π·
ΠΠ±ΡΠ΅ΠΊΡΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΠ΅ΡΡΡ Π»ΠΈΡΠΈΠΉ-Π·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅ΡΡΠΈΡΡ
Π¦Π΅Π»Ρ ΡΠ°Π±ΠΎΡΡ: ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΡΠ΅ΡΠΌΠΎΠΌΠ°Π³Π½ΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΎΡΠ΅Π½ΠΊΠΈ ΡΠ°Π·ΠΎΠ²ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ².
ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΌΠΈΠ½ΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΡΠ°Π·Ρ Π² ΡΠ΅ΡΡΠΈΡΠ΅, ΠΏΡΠΈ ΠΊΠΎΡΠΎΡΠΎΠΌ ΠΌΠΎΠΆΠ½ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΡ ΠΎΠ±ΡΠ°Π·Π΅Ρ ΡΠ΅ΡΠΌΠΎΠΌΠ°Π³Π½ΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ.
ΠΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈ Π°ΠΏΠΏΠ°ΡΠ°ΡΡΡΠ°: ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠ΅ ΡΠ΅ΡΠΌΠΎΠ³ΡΠ°Π²ΠΈΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΡΠΈΠ²ΡΡ
(Π’Π/ΠΠ’Π) ΡΠ΅ΡΡΠΈΡΠΎΠ²ΡΡ
ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΎΡΡ Π½Π° ΡΠ΅ΡΠΌΠΈΡΠ΅ΡΠΊΠΎΠΌ Π°Π½Π°Π»ΠΈΠ·Π°ΡΠΎΡΠ΅ STA 449C Jupiter (Netzsch, ΠΠ΅ΡΠΌΠ°Π½ΠΈΡ) Ρ ΠΏΡΠΈΠ»ΠΎΠΆΠ΅Π½Π½ΡΠΌ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΠΌ ΠΏΠΎΠ»Π΅ΠΌ. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΡΠ°Π·ΠΎΠ²ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π΄ΠΈΡΡΠ°ΠΊΡΠΎΠΌΠ΅ΡΡΠ° ARL XβTRA.The object of research is the lithium-substituted ferrites
Objective: To determine the sensitivity of the termomagnitometry method assessment phase structure of magnetic materials.
Determination of the minimum content of the magnetic ferrite phase, in which the sample can be examined by termomagnitometry method.
The methodology of the research and instruments: measurement of thermogravimetric curve (TG / DTG) ferrite samples was carried out on the thermal analyzer STA 449C Jupiter (Netzsch, Germany) with an applied magnetic field. Determination of the phase composition using a diffractometer ARL X'TRA
Synthesis, Crystal Structures, and Hydrogen-Storage Properties of Eu(AlH<sub>4</sub>)(<sub>2</sub>) and Sr(AlH<sub>4</sub>)(<sub>2</sub>) and of Their Decomposition Intermediates, EuAlH<sub>5</sub> and SrAlH<sub>5</sub>
Complex Eu(AlH4)(2) and SrAlH4(2) hydrides have been prepared by a mechanochemical metathesis reaction from NaAlH4 and europium or strontium chlorides. The crystal structures were solved from powder X-ray diffraction data in combination with solid-state 27Al NMR spectroscopy. The thermolysis pathway was analyzed in detail, allowing identification of new intermediate EuAlH5/SrAlH5 compounds. Rehydrogenation experiments indicate that the second decomposition step is reversible
Crystal Structure Refinement and Electronic Properties of Si(cI16)
International audienceSi(cI16) is prepared in polycrystalline form at 12(1.5) GPa at temperatures between 800(80) K and 1200(120) K. The crystal structure is refined by a full-profile method using x-ray powder diffraction data. Si(cI16) is diamagnetic (Chi0 = β5.6(1.8) x 10β6 emu molβ1) and shows a weakly temperature-dependent electrical resistivity (Rho(300 K) = 0.3 x 10β3 Ohm m). Computations of structural and electronic properties of Si(cI16) within the local density approximation evidence the metastable character of the allotrope with respect to diamond-type silicon. The calculations yield a positional parameter which is in perfect agreement with the refined value. In agreement with the experimentally observed conductivity properties, the computed density of states evidence that the Fermi level of Si(cI16) is located in a pseudo-gap