Tian Yanwen(田彦文),
Ma Ping(马 平),
Zhang Xin(张 新),
Zhai Yuchun(翟玉春)
School of Materials and Metallurgy,
Northeastern University, Shenyang 110006, P. R. China
Abstract: The phase and the structure of polycrystal material, which was prepared by calcining the co-precipitated fluoride powder of Sr and La with a ratio o f 0.69∶0.31 mixed with SrS powder, were investigated by X-ray diffraction and electron probe scanning. In the materials, three phases were found, they are Sr0.69La0.31F2.31 solid solution phase with a pure SrF2 cubic structure whose lattice constant is 5.843A; , SrS single phase with a NaCl cubic structure, and an unknown phase that is produced by the interaction of SrS and co-precipitated powder. It was also found that SrS has no influence on the structure of Sr0.69La0.31F2.31 solid solution.
Key words: X-ray diffraction; electron probe; polycrystal Sr0.69La0.31F2.31+SrS material; phase structure
Project 901450 supported by the Doctoral Foundation of the Education Ministry of China Received Nov. 13, 1998; accepted Apr. 7, 1999