THERMAL-EXPANSION BEHAVIOR OF SOME RARE-EARTH-OXIDE PYROCHLORES

被引：114

作者：

KUTTY, KVG ^{[1
]}

RAJAGOPALAN, S ^{[1
]}

MATHEWS, CK ^{[1
]}

VARADARAJU, UV ^{[1
]}

机构：

[1] INDIANA INST TECHNOL,MAT SCI RES CTR,FT WAYNE,IN 46803

来源：

MATERIALS RESEARCH BULLETIN | 1994年 / 29卷 / 07期

关键词：

PYROCHLORES; OXIDES; LANTHANIDE; ZIRCONATE; HAFNATE; RARE EARTH;

D O I：

10.1016/0025-5408(94)90201-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxide pyrochlores of the composition Ln2M2O7 (Ln = La - Gd; M = Zr, Hf) have been prepared and their thermal expansion coefficients determined in the temperature range 298 - 1500 K by means of high temperature x-ray powder diffractometry. It is seen that for a given M atom, the expansion coefficient increases with the atomic number of the lanthanide element. Between the Zr and Hf series of compounds, the zirconates are found to be more expansive. The results support the ionic model for this class of compounds.

引用

页码：759 / 766

页数：8

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