Magnetic properties of coprecipitated barium ferrite powders as a function of synthesis conditions

被引：52

作者：

Janasi, SR ^{[1
]}

Rodrigues, D ^{[1
]}

Landgraf, FJG ^{[1
]}

Emura, M ^{[1
]}

机构：

[1] Inst Technol Res, Powder Met & Magnet Mat Lab, Sao Paulo, Brazil

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2000年 / 36卷 / 05期

基金：

巴西圣保罗研究基金会;

关键词：

barium ferrites; coprecipitation; magnetic properties; permanent magnet;

D O I：

10.1109/20.908788

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Barium ferrite is widely used as permanent magnets because of its large coercivity and low cost. The usual route to produce barium ferrites is the ceramic method. In order to overcome the detrimental milling effects in the magnetic properties, ferrite powders were obtained by coprecipitation, This method can produce high purity materials with a narrow particle size distribution, In this work, the effects of the pH during coprecipitation, the molar ratio (Fe/Ba), and calcination temperature on the magnetic properties were investigated. The products were characterized by differential thermal analysis, X ray diffractometry scanning electron microscopy, thermomagnetic analysis. The magnetic properties were evaluated by vibrating sample magnetometer, Very fine particles with intrinsic coercivities up to 392 kA/m (4.92 kOe) were achieved.

引用

页码：3327 / 3329

页数：3

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