New results of the crystallization behaviour of hexagonal barium ferrites from a glassy matrix

被引：7

作者：

Schadewald, U. ^{[1
]}

Halbedel, B. ^{[1
]}

Romanus, H. ^{[1
]}

Huelsenberg, D. ^{[1
]}

机构：

[1] Tech Univ Ilmenau, Inst Mat Technol, Dept Glass & Ceram Technol, D-98684 Ilmenau, Germany

来源：

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK | 2006年 / 37卷 / 11期

关键词：

barium hexaferrite; glass crystallization;

D O I：

10.1002/mawe.200600084

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Starting from thermoanalytic measurements of amorphous material with a composition of 40 BaO - 33 B2O3 - 27 Fe2O3 (mole - %) the onset temperatures of four exothermic reaction peaks have been obtained. On the basis of this results the amorphous material was tempered under different conditions (heating rate and tempering time). The resulting reaction products were analyzed by X - ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), chemical analyses and by a vibrating sample magnetometer (VSM) to obtain information about their chemical composition, their structure and their magnetic properties. In contrast to former studies [2,3,4] it was found, that first an iron - rich phase forms at temperatures about 520 degrees C - 560 degrees C [5] followed by the crystallization of BaB2O4.

引用

页码：941 / 944

页数：4