Study of occupational sites and dielectric properties of Ho-Mg and Ho-Mn substituted BaTiO3

被引：44

作者：

Kishi, H ^{[1
]}

Kohzu, N

Iguchi, Y

Sugino, J

Kato, M

Ohsato, H

Okuda, T

机构：

[1] Taiyo Yuden Co Ltd, Gen R&D Labs, Gunma 3703347, Japan

[2] Nagoya Inst Technol, Dept Mat Sci & Engn, Showa Ku, Nagoya, Aichi 4668555, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 2000年 / 39卷 / 9B期

关键词：

barium titanate; magnesium substitution; manganese substitution; rare-earth oxide; holmium substitution; lattice parameter; dielectric property; Curie point; re-oxidation; acceptor; donor;

D O I：

10.1143/JJAP.39.5533

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of re-oxidation treatment on the solubility in dopants and the dielectric properties of Ho-Mg- and Ho-Mn-substituted BaTiO3 was investigated. The lattice parameter and electrical resistivity results indicated that the pre dominant occupational sites of Ho ions changed from A-sites to B-sites by increasing the doped content in both systems. In the case of Ho-Mn-substituted samples, the decrease in lattice parameter and a shift of the Curie point (T-c) to higher temperatures by re-oxidation treatment were observed in the range in which Ho ions predominantly occupy B-sites (act as accepters). On the other hand, Ho-Mg-substituted samples showed little change. Electron spin resonance measurements revealed that these changes due to re-oxidation were based on the decrease of the ionic size of Mn due to the oxidation of Mn2+ to Mn3+ or Mn4+ The occupational sites of Ho ions strongly affected the valence state of Mn and the dielectric properties of BaTiO3.

引用

页码：5533 / 5537

页数：5

共 10 条

[1] Donor-acceptor charge complex formation in barium titanate ceramics: Role of firing atmosphere [J].