稀土焦绿石化合物R2Fe4/3W2/3O7的高温高压稳定性研究和X射线相分析

A Study on the High Temperature-High Pressure Stability and the X-Ray Phase Analysis for Compounds R2Fe4/3W2/3O7 with Pyrochlore Structure

1.
Department of Physics, Jilin University, Changchun 130023, China;
2.
Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130021, China

摘要: 本文利用X射线粉末衍射和位敏探测技术，研究了R2Fe4/3W2/3O7（R=Er、Yb、Dy）化合物经高温高压处理后的变化情况。在3.7 GPa，1 200 ℃条件下，六方相R2Fe4/3W2/3O7化合物按两种方式分解，而直接由R2O3，Fe2O3和WO3原料出发，经上述同样的高温高压条件合成所得的产物与六方相高温高压分解产物相同，均为R2WO6、RFeO3、WO3和Fe2O3的多相聚合物。同时给出了R2Fe4/3W2/3O7六方相高温高压下的稳定区范围。
- R2Fe4/3W2/3O7 /
- 高温高压 /
- 相分解 /
- X射线衍射 /
- 位敏探测技术
Abstract: The compounds R2Fe4/3W2/3O7 (R=Er, Yb, Dy) treated with high temperature-high pressure have been studied by X-ray diffraction and PSPC. It is found that under the condition of 3.7 GPa and 1 200 ℃, the compounds with hexagonal pyrochlore structure synthesized under atmospheric pressure and high temperature and decompose into a polyphase compound system (R2WO6, RFeO3, WO3 and Fe2O3). It is also found that under the condition of same high temperature but high pressure, the mixture of R2O3, Fe2O3 and WO3 composed to same polyphase compound system too. The stable zone of compound R2Fe4/3W2/3O7 under high pressure is described in this paper.
- R2Fe4/3W2/3O7 /
- high temperature-high pressure /
- decomposition /
- X-ray analysis /
- PSPC