High quality anisotropic lead system ferrite magnets

Author

Yamamoto, Hiroshi ; Nagakura, Mitsuru

Author_Institution

Meiji University, Kawasaki, Japan

Volume

Issue

fYear

1987

fDate

1/1/1987 12:00:00 AM

Firstpage

294

Lastpage

299

Abstract

An experiment was carried out to investigate the effect of La2O3addition on magnetic and physical properties of anisotropic Pb ferrite magnets. It was found that La2O3addition to Pb ferrite is very useful in stabilizing the magnetoplumbite structure and that these Pb-La ferrites have excellent properties as a permanent magnet. Compositions were chosen according to the formula (PbO.n Fe2O3)100-x(La2O3)x, where x was varied between 0 and 4.0, and n between 4.5 and 6.25. The optimum conditions of making magnets and some properties of a typical sample are the following: composition (PbO . 6Fe2O3)97(La2O3)3, semisintering condition 1250°C × 1 h in O2gas, sintering condition 1275°C × 0.5 h in O2gas. Magnetic properties: $4\\pi J_{10k} = 4250$ G, $4\\pi J_{r}= 4100$ G, $H_{CJ} = 1850$ Oe, $H_{CB} = 1800$ Oe, $(BH)_{\\max } = 3.6 MG$ . Oe, $\\sigma _{s} = 63.6$ emu/g (at 25°C), $T_{c} = 443\\deg$ C, $K_{A} = 3.28 \\times 10^{6}$ erg/cm³, $H_{A} = 19.6$ kOe.

Keywords

Ferrite materials/devices; Lead materials/devices; Magnetic anisotropy; Permanent magnet materials; Rare-earth materials/devices; Anisotropic magnetoresistance; Ferrites; Lead; Magnetic anisotropy; Magnetic properties; Permanent magnets; Perpendicular magnetic anisotropy; Raw materials; Saturation magnetization; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1987.1064792

Filename

1064792

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1021679