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稀土焦绿石化合物Er-2Fe4/3W2/3O7的高温高压多形转变
The Polymorphic Transformation for the Compound Er2Fe4/3 W2/3 O7 of Rare Earth-Pyrochlore Structure Under High Pressure and High Temperature
【摘要】 <正> F.Basile和M.A.Subramanian等人在常压高温下合成出变形的焦绿石化合物Er2Fe4/3W2/3O7,并用X射线粉末衍射法定出其结构属六方晶系。但对这种化合物的高温高压结构研究未见文献报导。我们在高压高温下进行了这种化合物的多形转变的研究。
【Abstract】 The polymorphic transformation of the compound Er2Fe4/3 W2/3O7 with hexagonal pyrochlore structure has been studied by high pressure and high temperature.It is found that the compound Er2Fc4/3 W2/3 O7 has a phase transition from hexagonal to triclinic structure at 4.0GPa and 1200℃.Under this synthetic condition,the products of both synthesized directly from the mixture (Ⅰ) and from those hexagonal Er2Fe4/3 W2/3 O7 (Ⅰ) have the same structures ( triclinic).
【基金】 中国科学院科学基金
- 【文献出处】 高等学校化学学报 ,Chemical Research In Chinese Universities , 编辑部邮箱 ,1986年08期
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