Studies on the solid solution of Mn in BaTiO3

被引：60

作者：

Kirianov, A

Ozaki, N

Ohsato, H

Kohzu, N

Kishi, H

机构：

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

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

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2001年 / 40卷 / 9B期

关键词：

barium titanate; manganese ion; Raman spectrum; hexagonal phase; cubic phase; lattice parameter; oxygen partial pressure; Jahn-Teller distortion;

D O I：

10.1143/JJAP.40.5619

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

BaTi1-xMnxO3 solid solutions with 0 < x < 0.04 were synthesized in reducing atmosphere (P-O2 < 10(-9) Pa) and in air at 1350 degreesC for 2h. The effect of Mn ions with different valences on the crystal structure of BaTiO3 was studied by the room-temperature Raman scattering, electron spin resonance (ESR) and X-ray powder diffraction analyses. The crystal structure of the solid solution was analyzed to determine the change of its lattice parameters. It was found that in a reducing atmosphere, Mn2+ ions promoted the tetragonal-to-cubic transformation, as both a contraction of c-axis and an extension of a-axis were observed with an increase in Mn content. In contrast, Mn ions in the air-synthesized samples promoted the tetragonal-to-hexagonal transformation. The formation of the hexagonal phase was accompanied by a strong extension of the c-axis of the tetragonal phase from 4.032 Angstrom to 4.042 Angstrom. This was attributed to Jahn-Teller distortions caused by Mn3+ ions.

引用

页码：5619 / 5623

页数：5