مرکز منطقه ای اطلاع رساني علوم و فناوري - High quality anisotropic lead system ferrite magnets

DocumentCode :

1021679

Title :

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.ricest.ac.ir/dl/search/defaultta.aspx?DTC=49&DC=1021679