学术探索
学术期刊
新闻热点
数据分析
智能评审

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.
引用
收藏
页码：290 / 295
页数：6
相关论文
共 19 条
[1]   THE DETERMINATION OF HOPPING RATES AND CARRIER CONCENTRATIONS IN IONIC CONDUCTORS BY A NEW ANALYSIS OF AC CONDUCTIVITY [J].
ALMOND, DP ;
DUNCAN, GK ;
WEST, AR .
SOLID STATE IONICS, 1983, 8 (02) :159-164
[2]   IONIC-CONDUCTIVITY STUDIES ON LI1-XM2-XMX'P3O12 (M=HF, ZR - M' =TI, NB) [J].
CHOWDARI, BVR ;
RADHAKRISHNAN, K ;
THOMAS, KA ;
RAO, GVS .
MATERIALS RESEARCH BULLETIN, 1989, 24 (02) :221-229
[3]  
DANIELKA, 1983, COLLECT CZECH CHEM C, V48, P2197
[4]   NEW PYROCHLORES OF SYSTEMS MTO3-WO3 AND MTO3-TEO3 (M-K,RB,CS,TL,) (T-NB,TA) [J].
DARRIET, B ;
RAT, M ;
GALY, J ;
HAGENMULLER, P .
MATERIALS RESEARCH BULLETIN, 1971, 6 (12) :1305-+
[5]   TL-205 AND F-19 NMR-STUDY OF IONIC MOTION AND STRUCTURE IN A SERIES OF THALLIUM PYROCHLORE IONIC CONDUCTORS [J].
ENGLISH, AD ;
SLEIGHT, AW ;
FOURQUET, JL ;
DEPAPE, R .
MATERIALS RESEARCH BULLETIN, 1980, 15 (12) :1727-1735
[6]   IONIC-CONDUCTIVITY OF MIXED K(NBW)O6 AND KH2O(NBW)O6 [J].
GARCIAMARTIN, S ;
VEIGA, ML ;
GAITAN, M ;
JEREZ, A ;
PICO, C ;
SANTAMARIA, J .
SOLID STATE IONICS, 1988, 27 (03) :195-198
[7]  
GARCIAMARTIN S, 1992, SOLID STATE IONICS //, P455
[8]   STUDIES ON COMPOSITION, STRUCTURE AND IONIC-CONDUCTIVITY OF THE PYROCHLORE TYPE SYSTEM K1+XTA1+XW1-XO6.NH2O, O LESS-THAN-OR-EQUAL-TO X LESS-THAN-OR-EQUAL-TO 1 [J].
GRINS, J ;
NYGREN, M ;
WALLIN, T .
MATERIALS RESEARCH BULLETIN, 1980, 15 (01) :53-61
[9]  
HODGE IM, 1976, J ELECTROANAL CHEM, V74, P125, DOI 10.1016/S0022-0728(76)80229-X
[10]   DEFECT PYROCHLORE STRUCTURE A2B2X6 - A GENERAL-APPROACH TO THE COORDINATION POLYHEDRA AROUND THE METAL-IONS [J].
JEREZ, A ;
LOPEZ, ML ;
GARCIAMARTIN, S ;
VEIGA, ML ;
PICO, C .
JOURNAL OF MATERIALS SCIENCE, 1991, 26 (19) :5163-5166
12