XRD study of ZrW2O8 versus temperature and pressure

被引：21

作者：

Gallardo-Amores, JM

Amador, U

Morán, E

Alario-Franco, MA

机构：

[1] Univ San Pablo CEU, FCC Expt & Tecn, Dept Quim Inorgan & Mat, Madrid 28668, Spain

[2] Univ Complutense Madrid, Fac Ciencias Quim, Lab Altas Presiones, E-28040 Madrid, Spain

来源：

INTERNATIONAL JOURNAL OF INORGANIC MATERIALS | 2000年 / 2卷 / 01期

关键词：

ceramics; high pressure; X-ray diffraction; thermal expansion;

D O I：

10.1016/S1466-6049(00)00004-0

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

ZrW2O8 samples have been prepared from ZrO2 and WO3 precursors by a ceramic method. Different portions of this material were subjected to non cumulative pressure treatments within the 2-65 Kbar range; the metastable high-pressure phase, gamma-ZrW2O8, has been isolated by quenching from 6 Kbar. Further pressure increases up to 10 Kbar produced the volume reduction of the gamma-phase; a minimum volume was found even after having released the pressure. Otherwise, heating above 600 degrees C, followed by quenching at 77 K leads to the high-temperature phase, beta-ZrW2O8, which is stable at room temperature. Finally, when gamma-ZrW2O8 was subjected to pressure and temperature, gamma-ZrW2O8 could also be quenched with a still larger volume reduction at 6 Kbar and 600 degrees C. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：123 / 129

页数：7

共 18 条

[11] Pressure-induced amorphization and negative thermal expansion in ZrW2O8 [J].