Anisotropy and thermal stability of hot-forged BICUTIVOX oxygen ion conducting ceramics

被引：11

作者：

Fuierer, Paul ^{[1
]}

Maier, Mitchell ^{[1
]}

Exner, Joerg ^{[2
]}

Moos, Ralf ^{[2
]}

机构：

[1] New Mexico Inst Min & Technol, Dept Mat & Met Engn, Socorro, NM 87801 USA

[2] Univ Bayreuth, Fac Engn Sci, Dept Funct Mat, D-95447 Bayreuth, Germany

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2014年 / 34卷 / 04期

基金：

美国国家科学基金会;

关键词：

BIMEVOX; Hot-forging; Preferred orientation; Ionic conductivity; Thermal expansion; TRANSPORT-PROPERTIES; PHASE-TRANSITIONS; OXIDE; BICUVOX; IMPEDANCE; BICOVOX; DEPENDENCE; FAMILY; CO;

D O I：

10.1016/j.jeurceramsoc.2013.10.016

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：

The oxygen ion conductivity of ultra dense, hot forged Bi-4(MexV1-x)(2)O-11 (BIMEVOX) ceramics is reported for the first time. A novel approach to electrode preparation, including laser trenching, was developed to perform 4-probe impedance spectroscopy and determine conductivity of small bar-shaped samples with high accuracy and precision. Hot forged (HF) Bi-4(Cu0.05Ti0.05V0.90)(2)O-11 (BICUTIVOX) ceramic, with modest preferred orientation (11%), exhibits anisotropy by a factor of 2 in its conductivity. Brick layer model (BLM) analysis of complex impedance plots reveals that the relative contribution of grains and grain boundaries to the total resistance is direction dependent, in the low temperature gamma phase. The total ionic conductivity of BICUTIVOX, prepared either by hot-forging or conventional sintering, appears to be stable with thermal aging and cycling. Anisotropy in the thermal expansion of polycrystalline BIMEVOX ceramics is also reported. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：943 / 951

页数：9

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