Preparation, characterization and electrical conductivity studies of NdYb1-xGdxZr2O7 (0 ≤ x ≤ 1 0) ceramics

被引：12

作者：

Liu, Zhan-Guo ^{[1
]}

Ouyang, Jia-Hu ^{[1
]}

Sun, Ke-Ning ^{[2
]}

Xia, Xiao-Liang ^{[1
]}

机构：

[1] Harbin Inst Technol, Inst Adv Ceram, Dept Mat Sci, Harbin 150001, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, Acad Fundamental & Interdisciplinary Sci, Harbin 150001, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 28期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

NdYb1-xGdxZr2O7; Electrical conductivity; Impedance spectroscopy; Solid electrolyte; THERMAL-CONDUCTIVITY; OXIDE; PYROCHLORE; ENHANCEMENT; YTTERBIUM; FLUORITE; SYSTEMS;

D O I：

10.1016/j.electacta.2010.07.060

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Several compositions of NdYb1-xGdxZr2O7 (0 <= x <= 1 0) ceramics were prepared by pressureless-sintering method at 1973 K for 10h in air The relative density microstructure and electrical conductivity of NdYb1-xGdxZr2O7 ceramics were analyzed by the Archimedes method X-ray diffraction scanning electron microscopy and impedance plots measurements NdYb1-xGdxZr2O7 (0 <= x <= 0 3) ceramics have a single phase of defect fluorite-type structure and NdYb1-xGdxZr2O7 (0 7 <= x <= 1 0) ceramics exhibit a single phase of pyrochlore-type structure however the NdYb0 5Gd0 5Zr2O7 composition shows mixed phases of both defect fluorite-type and pyroch lore-type structures The measured values of the grain conductivity obey the Arrhenius relation The grain conductivity of each composition in NdYb1-xGdxZr2O7 ceramics gradually increases with increasing temperature from 673 to 1173 K. NdYb1-xGdxZr2O7 ceramics are oxide-ion conductor in the oxygen partial pressure range of 1 0 x 10(-4) to 1 0 atm at all test temperature levels The highest grain conductivity value obtained in this work is 1 79 x 10(-2)S cm(-1) at 1173 K for NdYb0 3Gd0 7Zr2O7 composition (C) 2010 Elsevier Ltd All rights reserved

引用

页码：8466 / 8470

页数：5

共 25 条

[1] Frequency dependence of the complex impedances and dielectric behaviour of some Mg-Zn ferrites [J].

Abdullah, MH ;

Yusoff, AN .

JOURNAL OF MATERIALS SCIENCE, 1997, 32 (21) :5817-5823

[2] Recent advances in materials for fuel cells [J].

Brandon, NP ;

Skinner, S ;

Steele, BCH .

ANNUAL REVIEW OF MATERIALS RESEARCH, 2003, 33 :183-213

[3] Intermediate temperature solid oxide fuel cells [J].

Brett, Daniel J. L. ;

Atkinson, Alan ;

Brandon, Nigel P. ;

Skinner, Stephen J. .

CHEMICAL SOCIETY REVIEWS, 2008, 37 (08) :1568-1578

[4] The current status of fuel cell technology for mobile and stationary applications [J].

de Bruijn, F .

GREEN CHEMISTRY, 2005, 7 (03) :132-150

[5] Effect of La substitution for Gd in the ionic conductivity and oxygen dynamics of fluorite-type Gd2Zr2O7 [J].

Diaz-Guillen, J. A. ;

Diaz-Guillen, M. R. ;

Almanza, J. M. ;

Fuentes, A. F. ;

Santamaria, J. ;

Leon, C. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2007, 19 (35)

[6] Electrolytes for solid oxide fuel cells [J].

Fergus, Jeffrey W. .

JOURNAL OF POWER SOURCES, 2006, 162 (01) :30-40

[7] Oxide-ion electrolytes [J].

Goodenough, JB .

ANNUAL REVIEW OF MATERIALS RESEARCH, 2003, 33 :91-128

[8]

GUILLEN JAD, 2009, J POWER SOURCES, V186, P349

[9] A brief review of the ionic conductivity enhancement for selected oxide electrolytes [J].

Hui, Shiqiang ;

Roller, Justin ;

Yick, Sing ;

Zhang, Xinge ;

Deces-Petit, Cyrille ;

Xie, Yongsong ;

Maric, Radenka ;

Ghosh, Dave .

JOURNAL OF POWER SOURCES, 2007, 172 (02) :493-502

[10] Transport properties of solid oxide electrolyte ceramics: a brief review [J].

Kharton, VV ;

Marques, FMB ;

Atkinson, A .

SOLID STATE IONICS, 2004, 174 (1-4) :135-149

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