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Morozov V, Arakcheeva A, Redkin B, et al. Na(2/7)Gd(4/7)MoO4: a modulated scheelite-type structure and conductivity properties. Inorg Chem. 2012;51(9):5313-24doi: 10.1021/ic300221m.
Morozov, V., Arakcheeva, A., Redkin, B., Sinitsyn, V., Khasanov, S., Kudrenko, E., Raskina, M., Lebedev, O., & Van Tendeloo, G. (2012). Na(2/7)Gd(4/7)MoO4: a modulated scheelite-type structure and conductivity properties. Inorganic chemistry, 51(9), 5313-24. https://doi.org/10.1021/ic300221m
Morozov, V, et al. "Na(2/7)Gd(4/7)MoO4: a modulated scheelite-type structure and conductivity properties." Inorganic chemistry vol. 51,9 (2012): 5313-24. doi: https://doi.org/10.1021/ic300221m
Morozov V, Arakcheeva A, Redkin B, Sinitsyn V, Khasanov S, Kudrenko E, Raskina M, Lebedev O, Van Tendeloo G. Na(2/7)Gd(4/7)MoO4: a modulated scheelite-type structure and conductivity properties. Inorg Chem. 2012 May 07;51(9):5313-24. doi: 10.1021/ic300221m. Epub 2012 Apr 19. PMID: 22515515.
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Inorg Chem. 2012 May 07;51(9):5313-24. doi: 10.1021/ic300221m. Epub 2012 Apr 19.

Na(2/7)Gd(4/7)MoO4: a modulated scheelite-type structure and conductivity properties.

Inorganic chemistry

V Morozov, A Arakcheeva, B Redkin, V Sinitsyn, S Khasanov, E Kudrenko, M Raskina, O Lebedev, G Van Tendeloo

Affiliations

  1. Chemistry Department, Moscow State University, 119991 Moscow, Russia. [email protected]

PMID: 22515515 DOI: 10.1021/ic300221m

Abstract

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).

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