MICROSTRUCTURE OF RAPIDLY QUENCHED BISMUTH IRON-OXIDE SYSTEMS WITH FERROMAGNETIC CHARACTER

被引：6

作者：

TANAKA, K ^{[1
]}

HIRAO, K ^{[1
]}

SOGA, N ^{[1
]}

MORI, H ^{[1
]}

机构：

[1] OSAKA UNIV, ULTRA HIGH VOLTAGE ELECTRON MICROSCOPY RES CTR, SUITA, OSAKA 565, JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1991年 / 30卷 / 12B期

关键词：

AMORPHOUS OXIDE; FERROMAGNETISM; TWIN-ROLLER METHOD; HIGH-RESOLUTION ELECTRON MICROSCOPY; MOSSBAUER MEASUREMENTS; SHTRIKMAN-WOHLFARTH MODEL;

D O I：

10.1143/JJAP.30.L2095

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Mossbauer measurements and high-resolution electron microscopy have been carried out on rapidly quenched 10CaO . 30Bi2O3 . 6OFe2O3 and Bi3Fe5O12 which exhibit ferromagnetic character at room temperature. The intensity of the peaks due to internal fields in Mossbauer spectra are very weak at room temperature and increases with a decrease of temperature, indicating that the specimens are superparamagnetic. The electron micrograph clearly shows that the specimens contain microcrystals of 5 to 10 nm. The ferromagnetic character of the present oxides is brought about by the ferrimagnetic microcrystals precipitated.

引用

页码：L2095 / L2097

页数：3