Nano-ceria enhancement of Bi₂Cu_0.1 V_0.9O_5.35 (BICUVOX) ceramic electrolytes

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• 作者：Edward M. Sabolsky ; ^{Ed.sabolsky@mail.wvu.edu} ; Soheil Razmyar ^{srazmyar@mix.wvu.edu} ; Katarzyna Sabolsky ^{Kathy.sabolsky@mail.wvu.edu}
• 关键词：Ceramic ; Electrolyte ; Ionic conductivity ; Nanomaterial ; BICUVOX
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 June, 2012
• 卷：76
• 期：Complete
• 页码：47-50
• 文件大小：556 K

摘要

Doped nano-ceria particulates ((Ce_0.9Gd_0.1)O₂, GDC) were synthesized by hydrothermal processes and dispersed within a matrix of copper-doped bismuth vanadate (Bi₂V_0.9Cu_0.1O_5.35, BICUVOX) powder at levels ranging from 0.2 to 4.0 wt.%. The BICUVOX powder was synthesized by a co-precipitation process which resulted in a homogenous, fine-grained powder with an average particle size of ~ 0.6 渭m. The BICUVOX/GDC composite was sintered at temperatures between 675 and 800 掳C for 4 h. The incorporation of the nano-GDC into the BICUVOX ceramic was shown to pin grain boundary mobility, which permitted sintering to high densities while retaining finer grain sizes (1-4 渭m in average size). The low levels of nano-GDC additions were shown to decrease the total conductivity of the BICUVOX electrolytes. Four-point conductivity testing of the BICUVOX/GDC (0.6 wt.%) composite in air showed values of ~ 0.008 S/cm and ~ 0.06 S/m at 300 掳C and 500 掳C, respectively. The average flexure strength of the same composite membrane was measured using a ring-on-ring configuration, and this measurement showed flexural strengths as high as 134.2 MPa. This strength is ~ 60%greater than previously reported values for BICUVOX membranes.