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 Mössbauer 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

Оценка чувствительности термомагнитометрического метода определения магнитных фвз

Объектом исследования является литий-замещенные ферриты Цель работы: определение чувствительности термомагнитометрического метода оценки фазового состава магнитных материалов. Определение минимального содержания магнитной фазы в феррите, при котором можно исследовать образец термомагнитометрическим методом. Методология проведения исследования и аппаратура: измерение термогравиметрических кривых (ТГ/ДТГ) ферритовых образцов проводилось на термическом анализаторе STA 449C Jupiter (Netzsch, Германия) с приложенным магнитным полем. Определение фазового состава с использованием дифрактометра ARL X’TRA.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(AlH₄)(₂) and Sr(AlH₄)(₂) and of Their Decomposition Intermediates, EuAlH₅ and SrAlH₅

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 = –5.6(1.8) x 10–6 emu mol–1) and shows a weakly temperature-dependent electrical resistivity (Rho(300 K) = 0.3 x 10–3 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