Enhanced ionic conductivity and phase meta-stability of nano-sized thin film yttria-doped zirconia (YDZ)

被引：65

作者：

Jung, WooChul ^{[1
]}

Hertz, Joshua L. ^{[1
]}

Tuller, Harry L. ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 05期

基金：

美国国家科学基金会;

关键词：

Yttria-doped zirconia (YDZ); Thin films; Impedance spectroscopy; Raman spectroscopy; Metastable phases; OXIDE FUEL-CELL; OXYGEN-TRANSPORT; DEPOSITION; MICROSTRUCTURE; ELECTROLYTES; MEMBRANES; BOUNDARY; SYSTEM; YSZ; DC;

D O I：

10.1016/j.actamat.2008.11.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Yttria-doped zirconia (YDZ) thin films with nanometric sized grains were prepared by reactive RF Sputtering and their oxygen ion conductivities were systematically measured as a function of yttria doping with levels in the range 0.5-9.1 mol.% Y(2)O(3). Enhanced oxygen ion Conductivities, as derived from impedance spectra, were observed when compared with values reported for bulk YSZ. Furthermore, the peak conductivity for the YDZ films was observed to occur at considerably reduced yttria levels. i.e.. at 6.5 mol.% Y(2)O(3) (for T > similar to 400 degrees C) and at 3.2 mol.% Y(2)O(3) (for T < similar to 300 degrees C) vs. 9 mol.% in bulk YSZ. Based on an analysis of the Raman spectra, these results are believed to result from the extended meta-stability of the cubic phase to reduced yttria levels at nanometric grain sizes. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1399 / 1404

页数：6

共 32 条

[21]

Luo J, 2000, J AM CERAM SOC, V83, P1703

[22] The kinetics of oxygen transport in 9.5 mol % single crystal yttria stabilised zirconia [J].