Low temperature sintering of LaNbO4 proton conductors from freeze-dried precursors

被引：25

作者：

Amsif, M. ^{[2
]}

Marrero-Lopez, D. ^{[1
]}

Ruiz-Morales, J. C. ^{[2
]}

Savvin, S. ^{[2
]}

Nunez, P. ^{[2
]}

机构：

[1] Univ Malaga, Dpto Fis Aplicada 1, Lab Mat & Superficies, Unidad Asociada,CSIC, E-29071 Malaga, Spain

[2] Univ La Laguna, Dpto Quim Inorgan, Tenerife 38200, Spain

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2012年 / 32卷 / 06期

关键词：

Proton conductor; LaNbO4; Fuel cells; Precursor synthesis; Impedance spectroscopy; FUEL-CELL APPLICATIONS; DOPED CEO2 CERAMICS; TRANSPORT-PROPERTIES; GRAIN-GROWTH; CONDUCTIVITY; OXIDES; ELECTROLYTE; MICROSTRUCTURE; BOUNDARIES;

D O I：

10.1016/j.jeurceramsoc.2011.11.027

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A synthesis method based on freeze-dried precursors was used to obtain nanocrystalline powders of pure and Ca-doped LaNbO4 at 800 degrees C. Dense ceramics were prepared at temperature as low as 1100 degrees C. The LaNbO4 ceramics were examined by scanning electron microscopy (SEM) to study the microstructure evolution with the sintering temperature. The densification and grain growth rate are lower in Ca-doped samples. The bulk and grain boundary contributions to the overall conductivity were studied by impedance spectroscopy under different gases. Samples sintered at low temperature and with smaller grain size exhibit higher grain boundary resistance and consequently lower total conductivity. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1235 / 1244

页数：10

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