Na2/7Gd4/7MoO4: a Modulated Scheelite-Type Structure and Conductivity Properties

被引：59
作者：
Morozov, V. [1 ]
Arakcheeva, A. [2 ,3 ]
Redkin, B. [4 ]
Sinitsyn, V. [4 ]
Khasanov, S. [4 ]
Kudrenko, E. [4 ]
Raskina, M. [1 ]
Lebedev, O. [5 ]
Van Tendeloo, G. [6 ]
机构：
[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia
[2] Ecole Polytech Fed Lausanne, Crystallog Lab, BSP, CH-1015 Lausanne, Switzerland
[3] Phase Solut Ltd, CH-1012 Lausanne, Switzerland
[4] Inst Solid State Phys, Chernogolovka 142452, Russia
[5] UMR 6508 CNRS ENSICAEN, Lab CRISMAT, F-14050 Caen, France
[6] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium
来源：
INORGANIC CHEMISTRY | 2012年 / 51卷 / 09期
基金：
俄罗斯基础研究基金会;
关键词：
SINGLE-CRYSTALS; SOLID ELECTROLYTES; IONIC-CONDUCTIVITY; RED PHOSPHORS; HIGH-PRESSURE; LUMINESCENCE; GROWTH; LASER; PHOTOLUMINESCENCE; NA;
D O I：
10.1021/ic300221m
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
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 (square) 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 Nd3+:M2/7Gd4/7 square 1/7MoO4 (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+), Gd3+, and vacancies in the crystal. A Na2/7Gd4/7MoO4 single crystal with scheelite-type structure has been grown by the Czochralski method. Transmission electron microscopy revealed that Na2/7Gd4/7MoO4 has a (3 + 2)D incommensurately modulated structure. The (3 + 2)D incommensurately modulated scheelite-type cation-deficient structure of Na2/7Gd4/7MoO4 [super space group (I4) over bar (alpha-beta 0,beta alpha 0)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 Na2/7Gd4/7MoO4 at T = 973 K equals sigma = 1.13 X 10(-5) Omega(-1) cm(-1).
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页码：5313 / 5324
页数：12
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