Microstructure evolution and electric properties with addition amounts of dysprosium (DyO1.5) in (BaCa)(TiZr)O3 ceramics

被引:4
作者
Hsiang, HI [1 ]
Lai, GP [1 ]
机构
[1] Natl Cheng Kung Univ, Dept Resources Engn, Tainan 70101, Taiwan
来源
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2005年 / 123卷 / 01期
关键词
BaTiO3; rare earth; dielectrics; reducing atmosphere; XPS;
D O I
10.1016/j.mseb.2005.07.003
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, the effects of various amounts of added DyO1.5 on the substitution mechanism for the (BaCa)(TiZr)O-3(BCTZ) ceramic sintered in a reduction atmosphere were investigated using X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS).The Dy3+ ion occupation sites depended on the A/B ratio, whereas sites for the C2+ ions were affected by the DyO1.5 added amount and A/B ratio. For the specimens with A/B ratios below 1, Dy3+ ions mainly occupied the A-sites, which expelled some C2+ ions to occupy B-sites, based on XPS spectra and lattice parameter results. The Dy3+ ions occupied A-sites acting as donor, which resulted in a decrease in resistivity. For the samples containing 0.01 mol% DyO1.5, the Dy2Ti2O7 phase was observed and the resistivity increased rapidly due to the incorporation of Dy3+ ions into B-sites at A/B ratios below 1. As the added DyO1.5 increased to 0.015 mol%, a certain number of Ca2+ ions were forced to shift from B-sites to A-sites, as suggested by XPS spectra and lattice parameter results, which resulted in a decrease in resistivity. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:69 / 73
页数:5
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