LOW-TEMPERATURE STRUCTURAL PHASE-TRANSITION IN SRMO6S8 STUDIED BY X-RAY-POWDER DIFFRACTION

被引：3
作者：
KOPPELHUBERBITSCHNAU, B
MAUTNER, FA
YVON, K
机构：
[1] GRAZ TECH UNIV,INST PHYS & THEORET CHEM,A-8010 GRAZ,AUSTRIA
[2] UNIV GENEVA,CRISTALLOG RAYONS-X LAB,CH-1211 GENEVA 4,SWITZERLAND
来源：
MONATSHEFTE FUR CHEMIE | 1990年 / 121卷 / 6-7期
关键词：
Chevrel phases; Crystal structure; Phase transition; Powder diffraction; Rietveld refinement; X-ray analysis;
D O I：
10.1007/BF00810858
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Lattice parameters as a function of temperature for, and atomic coordinates of the low-temperature phase of, SrMo6S8 are reported from X-ray powder diffraction. The structure transforms at T1=135(3) K from the rhombohedral high-temperature modification (R {Mathematical expression}, arh=6.5630 (3) Å, αrh=88.9982(2)°, Vrh=282.55(5)Å3 at 298 K) into the triclinic low-temperature modification (P {Mathematical expression}, atr=6.481(1)Å, btr=6.572(1)Å, ctr=6.611(1)Å, αtr=89.246(4)°, βtr=89.304(4)°, γtr=88.169(4)°, Vtr=281.4(2)Å3 at 20K). The triclinic distortion is larger than in the Ca analogue, and similar to the Ba and Eu analogues. © 1990 Springer-Verlag.
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页码：505 / 509
页数：5
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