Single-Crystal Structure of HP-Sc2TeO6 Prepared by High-Pressure/High-Temperature Synthesis

被引：2

作者：

Ziegler, Raimund ^{[1
]}

Tribus, Martina ^{[2
]}

Hejny, Clivia ^{[2
]}

Heymann, Gunter ^{[1
]}

机构：

[1] Leopold Franzens Univ Innsbruck, Dept Gen Inorgan & Theoret Chem, Innrain 80-82, A-6020 Innsbruck, Austria

[2] Leopold Franzens Univ Innsbruck, Inst Mineral & Petrog, Innrain 52, A-6020 Innsbruck, Austria

来源：

CRYSTALS | 2021年 / 11卷 / 12期

关键词：

high-pressure; crystal structure; scandium tellurate; tellurate(VI); BOND-VALENCE PARAMETERS; OXOTELLURATES(IV); REFINEMENT; TERNARY; SERIES;

D O I：

10.3390/cryst11121554

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The first high-pressure scandium tellurate HP-Sc2TeO6 was synthesized from an NP-Sc2TeO6 normal-pressure precursor at 12 GPa and 1173 K using a multianvil apparatus (1000 t press, Walker-type module). The compound crystallizes in the monoclinic space group P2/c (no. 13) with a = 729.43(3), b = 512.52(2), c = 1095.02(4) pm and beta = 103.88(1)degrees. The structure was refined from X-ray single-crystal diffractometer data: R-1 = 0.0261, wR(2) = 0.0344, 568 F-2 values and 84 variables. HP-Sc2TeO6 is isostructural to Yb2WO6 and is built up from TeO6 octahedra, typical for tellurate(VI) compounds. During synthesis, a reconstructive transition from P321 (normal-pressure modification) to P2/c (high-pressure modification) takes place and the scandium-oxygen distances as well as the coordination number of scandium increase. However, the coordination sphere around the Te6+ cations gets only slightly distorted. High-temperature powder XRD investigations revealed a back-transformation of HP-Sc2TeO6 to the ambient-pressure modification above 973 K.

引用

页数：10

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