文献类型：期刊文献

英文题名：Fabrication and characteristics of fine-grained BaTiO₃ ceramics by spark plasma sintering

作者：Luan, WL; Gao, L; Kawaoka, H; Sekino, T; Niihara, K

机构：[1]E China Univ Sci & Technol, Shanghai 200237, Peoples R China;[2]Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China;[3]Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan

年份：2004

卷号：30

期号：3

起止页码：405

外文期刊名：CERAMICS INTERNATIONAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000221033800011)】；

语种：英文

外文关键词：grain size; dielectric properties; barium titanate; spark plasma sintering; nanostructured materials

摘要：Fine-grained BaTiO3 ceramics were obtained at a low sintering tertiperature of 900 degreesC within a short sintering period by means of a new sintering method-spark plasma sintering (SPS). The ceramics are highly densified to more than 99% of the theoretical X-ray density with homogeneous microstructures, signifying that the SPS process is effective for the densifying of compacts and the inhibition of exaggerated grain growth. Nanocrystalline BaTiO3 powder of 13 nm grain size was used as the starting material. Observations of pellets by HRTEM indicated that the grains only support 180degrees domain structures and in some cases unusual twins were discovered. XRD measurement shows that in fine-grained SPS pellets a small amount of cubic phase is present. A clear dependence of the dielectric constant on grain size was observed. It is believed that the existence of twins is one of the key factors that resulted in the slight decrease of the dielectric constant of fine-grained ceramics. (C) 2003 Elsevier Ltd and Techna S.r.l. All rights reserved.