STRUCTURAL CHARACTERIZATION AND ELECTRICAL-PROPERTIES OF A NOVEL DEFECT PYROCHLORE

被引：55
作者：
ISASI, J
LOPEZ, ML
VEIGA, ML
RUIZHITZKY, E
PICO, C
机构：
[1] UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,DEPT QUIM INORGAN 1,E-28040 MADRID,SPAIN
[2] CSIC,INST MAT,MADRID,SPAIN
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 1995年 / 116卷 / 02期
关键词：
D O I：
10.1006/jssc.1995.1216
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Improved structural parameters for the defect pyrochlore K3/2Cr1/2Te3/2O . 0.5H(2)O have been determined by employing a full-profile Rietveld structure analysis of X ray powder-diffraction data. These results make it possible to establish the location of the atoms in the Fd3m space group as follows: K (32e), Te/Cr (16d), and O (48f); the unit cell parameter is a = 10.039 (1). The ionic conductivity of this material has been determined by ac methods (complex impedance measurements) in pressed pellets and the obtained data suggest the unique contribution of K mobile cation, with an activation energy of 0.7 eV. (C) 1995 Academic Press, Inc.
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页码：290 / 295
页数：6
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