Electric Field-assisted Pressureless Sintering of Ceramic Protonic Conductors

被引：1
作者：
Muccillo, R. [1 ,2 ]
Esposito, V [3 ]
de Florio, D. Z. [2 ]
Muccillo, E. N. S. [1 ]
机构：
[1] Energy & Nucl Res Inst, Ctr Sci & Technol Mat, Travessa R 400,Cidade Univ, BR-05508170 Sao Paulo, SP, Brazil
[2] Fed Univ ABC, Ctr Engn Modeling & Appl Social Sci, Av Estados 5001, BR-09210580 Santo Andre, SP, Brazil
[3] Tech Univ Denmark, Dept Energy Convers & Storage, Riso DTU Campus,Frederiksborgvej 399, DK-4000 Roskilde, Denmark
来源：
IONIC AND MIXED CONDUCTING CERAMICS 11 (IMCC 11) | 2017年 / 80卷 / 09期
基金：
巴西圣保罗研究基金会;
关键词：
DOPED BARIUM ZIRCONATE; YTTRIA-STABILIZED ZIRCONIA; CONDUCTIVITY; GROWTH; 3Y-TZP; CERATE;
D O I：
10.1149/08009.0111ecst
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Gadolinium, yttrium and samarium-doped barium cerate pressed pellets were submitted to flash sintering experiments isothermally in the temperature range 800-1300 degrees C under 200 V cm(-1) electric field. The pellets were positioned inside a dilatometer furnace with Pt-Ir electrodes connected either to a power supply or to an impedance analyzer to evaluate the bulk and the grain boundary contributions to the electrical resistivity. Near full density was achieved in the sintered samples. The combined results of dilatometry and impedance measurements in conventionally and flash sintered specimens show substantial improvement of the electrical conductivity. Joule heating is assumed to be the primary effect for sintering. Improved grain-to-grain contact and the removal of depleted chemical species due to Joule heating at the space charge region are proposed, respectively, as the reasons for the decrease of the grain boundary component in the impedance diagrams and the improvement of the bulk electrical conductivity.
引用
收藏
页码：111 / 118
页数：8
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