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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Er_2Fe_(4/3)W_(2/3)O_7,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。
F. Basile and M.A. Subramanian et al. Synthesized the deformed pyrochlore compound Er 2 Fe 4/3 W 2/3 O 7 at atmospheric pressure and high temperature. The structure of hexagonal crystal was determined by X-ray powder diffraction. However, there is no report about the structure of this compound under high temperature and high pressure. We studied the polymorphic transition of this compound under high pressure and temperature.