Effects of multi-doping of rare-earth oxides on the microstructure and dielectric properties of BaTiO3

被引：76

作者：

Jo, Soo Kyong ^{[1
]}

Park, Jae Sung ^{[2
]}

Han, Young Ho ^{[1
]}

机构：

[1] Sungkyunkwan Univ, Dept Mat Engn, Suwon 440746, South Korea

[2] Samsung Electromech Co, Suwon, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 501卷 / 02期

关键词：

Coating materials; Ferroelectrics; Chemical synthesis; Dielectric response; Oxide material; Microstructure;

D O I：

10.1016/j.jallcom.2010.04.085

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Effects of multi-doping of rare-earth oxides (R = Yb, Sm, Ho, La and Nd)on the microstructure development and electric properties of BaTiO3 ceramics were studied The addition of samarium oxide leads to poor densification and small grains, whereas ytterbium oxide develops large grains and secondary phases along the grain boundary, and Ho ion with an intermediate ionic radius gives rise to higher densities with fine grains. The grain size of Yb-doped BaTiO3 decreased with increasing Sm contents The system coated with 2.0 at % Sm and 2.0 at % Yb exhibited dense microstructures with uniform small grains, and Yb-rich second phases were not observed It was confirmed that an appropriate ratio of donor to acceptor is necessary to the optimum microstructure Curie temperature of rare-earth doped BaTiO3 was strongly dependent on the unit-cell volume associated with the ionic sizes of rare-earth ions. (C) 2010 Elsevier B V All rights reserved

引用

页码：259 / 264

页数：6