Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La1−xThxNbO4+x2 and LaNb1−xWxO4+x2
Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La1−xThxNbO4+x2 and LaNb1−xWxO4+x2
复制标题
氧过量白钨矿基化合物 La1−xThxNbO4+x2 和 LaNb1−xWxO4+x2 的晶体化学、调制结构和电导率
DOI：
10.1016/0022-4596(81)90398-4
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发表时间：
1981
影响因子：
3.3
通讯作者：
D. Minor
中科院分区：
文献类型：
--
作者：
R. Cava;R. Roth;T. Negas;H. S. Parker;D. Minor
对于La1 − xThxNbO4 + x2，在0.075≤ x≤ 0.37，0.41 < x<0.61，0.65 ≤ x≤ 0.74的范围内，存在三个具有宽均匀性区域的相。所有这些都与白钨矿结构类型有关，至少第一个表现出不相称的结构调制。在LaNb 1− x W x O 4+ x 2（0.11≤ x≤ 0.22）中发现了类似的结构调制相位。在La 0.2 Th 0.8 NbO 4.4和LaNb 0.4 W 0.6 O 4.3处出现另外的相。对La 1− x Th x NbO 4+ x 2（0.075≤ x≤ 0.37）相的电导率、结构调制的方向和波长进行了表征。
Abstract For La 1− x Th x NbO 4+ x 2, three phases with broad homogeneity regions occur, for 0.075≤ x≤ 0.37, 0.41< x< 0.61, and 0.65≤ x≤ 0.74. All are related to the scheelite structure type, with at least the first exhibiting an incommensurate structural modulation. An analogous structurally modulated phase was found for LaNb 1− x W x O 4+ x 2 for 0.11≤ x≤ 0.22. Additional phases occur at La 0.2 Th 0.8 NbO 4.4 and LaNb 0.4 W 0.6 O 4.3. The electrical conductivity and the direction and wavelength of the structural modulation have been characterized for the La 1− x Th x NbO 4+ x 2 phase with 0.075≤ x≤ 0.37.