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Na2/7Gd4/7MoO4: aModulatedScheelite-TypeStructure andConductivityProperties Vladimir A. MorozovAlla ArakcheevaB. S. Red’kin2012 год

Na2/7Gd4/7MoO4: a Modulated Scheelite-Type Structure and Conductivity Properties
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Аннотация: Scheelite-type compounds with the general formula (A1,A2)(n)[(B1,B2)O(4)](m) (2/3 ≤ n/m ≤ 3/2) are the subject of large interest owing to their stability, relatively simple preparation, and optical properties. The creation of cation vacancies (□) in the scheelite-type framework and the ordering of A cations and vacancies can be a new factor in controlling the scheelite-type structure and properties. For a long time, cation-deficient Nd(3+):M(2/7)Gd(4/7)□(1/7)MoO(4) (M = Li, Na) compounds were considered as potential lasers with diode pumping. They have a defect scheelite-type 3D structure (space group I4(1)/a) with a random distribution of Li(+)(Na(+)), Gd(3+), and vacancies in the crystal. A Na(2/7)Gd(4/7)MoO(4) single crystal with scheelite-type structure has been grown by the Czochralski method. Transmission electron microscopy revealed that Na(2/7)Gd(4/7)MoO(4) has a (3 + 2)D incommensurately modulated structure. The (3 + 2)D incommensurately modulated scheelite-type cation-deficient structure of Na(2/7)Gd(4/7)MoO(4) [super space group I4 (α-β0,βα0)00] has been solved from single-crystal diffraction data. The solution of the (3 + 2)D incommensurately modulated structure revealed the partially disordered distribution of vacancies and Na and Gd cations. High-temperature conductivity measurements performed along the [100] and [001] orientation of the single crystal revealed that the conductivity of Na(2/7)Gd(4/7)MoO(4) at T = 973 K equals σ = 1.13 × 10(-5) Ω(-1) cm(-1).
Год издания: 2012
Авторы: Vladimir A. Morozov, Alla Arakcheeva, B. S. Red’kin, V. V. Sinitsyn, Salavat S. Khasanov, Е. А. Кудренко, Maria V. Raskina, Oleg I. Lebedev, Gustaaf Van Tendeloo
Издательство: American Chemical Society
Источник: Inorganic Chemistry
Ключевые слова: Luminescence Properties of Advanced Materials, Microwave Dielectric Ceramics Synthesis, Ferroelectric and Piezoelectric Materials
Другие ссылки: Inorganic Chemistry (HTML)
PubMed (HTML)