Effects of pressure on the local atomic structure of CaWO4 and YLiF4:: mechanism of the scheelite-to-wolframite and scheelite-to-fergusonite transitions

被引：85

作者：

Errandonea, D

Manjón, FJ

Somayazulu, M

Häusermann, D

机构：

[1] Univ Politecn Valencia, Dept Fis Aplicada, Alcoy 03801, Alicante, Spain

[2] Univ Valencia, Edificio Invest, Dept Fis Aplicada, ICMUV, E-46100 Burjassot, Valencia, Spain

[3] Argonne Natl Lab, Carnegie Inst Washington, HPCAT, Adv Photon Source, Argonne, IL 60439 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 4-5期

关键词：

oxides; fluorides; high pressure; X-ray diffraction; phase transitions;

D O I：

10.1016/j.jssc.2003.10.017

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The pressure response of the scheelite phase of CaWO4 (YLiF4) and the occurrence of the pressure-induced scheelite-to-wolframite (M-fergusonite) transition are reviewed and discussed. It is shown that the change of the axial parameters under compression is related to the different pressure dependences of the W-O (Li-F) and Ca-O (Y-F) interatomic bonds. Phase transition mechanisms for both compounds are proposed. Furthermore, a systematic study of the phase transition in 16 different scheelite ABX(4) compounds indicates that the transition pressure increases as the packing ratio of the anionic BX4 units around the A cations increases. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：1087 / 1097

页数：11

共 64 条

[1] POLARIZED RAMAN-SPECTRA OF KIO4 AND RBIO4 AND HIGH-PRESSURE RAMAN STUDIES ON KIO4 [J].