Synthesis and characterization of KTh2SeE6, KTh2Te6 and CsTh2Se6

被引：30

作者：

Wu, EJ ^{[1
]}

Pell, MA ^{[1
]}

Ibers, JA ^{[1
]}

机构：

[1] NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1997年 / 255卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

synthesis; solid-state compounds;

D O I：

10.1016/S0925-8388(96)02838-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The compounds KTh2Se6, KTh2Te6 and CsTh2Se6 have been synthesized in the temperature range 873 to 923 K. These compounds are isostructural with the previously synthesized compound CsTh2Te6. They crystallize in the space group D-2h(17)-Cmcm of the orthorhombic system with two formula units in cells: a=4.14(2) Angstrom, b=21.88(4) Angstrom, c=5.64(1) Angstrom, V=511(4) Angstrom(3) (T=298 K) for KTh2Se6; a=4.356(1) Angstrom, b=23.702(7) Angstrom, c=6.141(2) Angstrom, V=634.1(3) Angstrom(3) for KTh2Te6 (T=113 K); and a=4.14(5) Angstrom, b=23.88(4) Angstrom, c=5.67(5) Angstrom, V=561(13) Angstrom(3) (T=298 K) for CsTh2Se6. The structure of KTh2Te6 has been determined from single-crystal X-ray data. The structure is composed of (2)(infinity)[Th2Te6-] layers that stack perpendicular to [010]. The layers are separated by K+ cations that are coordinated to eight Te atoms at the corners of a rectangular parallelepiped. The K site is one-half occupied. Te atoms form infinite chains within the layers along [001] with Te-Te distances between 3.057(3) Angstrom and 3.085(3) Angstrom. KTh2Se6, KTh2Te6 and CsTh2Se6 are highly resistive along [100].

引用

页码：106 / 109

页数：4

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