Abstract
The factors governing the transport properties of yttrium-doped barium zirconate (BYZ) have been explored, with the aim of attaining reproducible proton conductivity in well-densified samples. It was found that a small initial particle size (50-100 nm) and high-temperature sintering (1600 °C) in the presence of excess barium were essential. By this procedure, BaZr0.8Y0.2O3-8 with 93% to 99% theoretical density and total (bulk plus grain boundary) conductivity of 7.9 × 10-3 S/cm at 600 °C [as measured by alternating current (ac) impedance spectroscopy under humidified nitrogen] could be reliably prepared. Samples sintered in the absence of excess barium displayed yttria-like precipitates and a bulk conductivity that was reduced by more than 2 orders of magnitude.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1322-1330 |
| Number of pages | 9 |
| Journal | Journal of Materials Research |
| Volume | 22 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2007 |
Funding
We thank Mr. Jian-Zhen Lin, Ms. Hua-Guo Can and Ms. Li-Mei Feng for collecting the kanzawa spider mites from Fujian (Fuzhou), Jiangxi (Nanchang) and Taiwan (Pingdong), respectively. We are very grateful to Professor Johannes A. J. Breeuwer of the University of Amsterdam, the Netherlands, for his valuable suggestions and corrections of the manuscript. We are also thankful to several anonymous reviewers for suggestions. This study was supported in part by Grant-in-Aid from the National Basic Research Program of China (973 Program, No. 2006CB102001) and Grant-in-Aid for Scientific Research (No. 30370933) from the National Natural Science Foundation of China. This study was also supported in part by Grants-in-Aid for Scientific Research (Nos. 15380040 and 16405022) from the Japan Society for Promotion of Science.
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering