SUSCEPTIBILITY PHENOMENA IN A FINE PARTICLE SYSTEM .1. CONCENTRATION-DEPENDENCE OF THE PEAK

被引：142

作者：

ELHILO, M

OGRADY, K

CHANTRELL, RW

机构：

[1] UNIV COLL N WALES,SCH ELECT ENGN SCI,MAGNET MAT RES GRP,BANGOR LL57 1UT,GWYNEDD,WALES

[2] UNIV KEELE,DEPT PHYS,KEELE ST5 5BG,STAFFS,ENGLAND

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1992年 / 114卷 / 03期

关键词：

D O I：

10.1016/0304-8853(92)90272-P

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The concentration dependence of the peak in the dc susceptibility of a weakly interacting fine particle system consisting of Fe3O4 particles has been studied. Measurements of the initial susceptibility of the dispersion in the solid state show that the susceptibility values were depressed at low temperatures. The temperature of the peak (T(g)) in the susceptibility versus temperature curve was found to occur at higher temperatures as the concentration was increased. The variation of T(g) with concentration shows a simple power law relationship. The influence of dipolar interactions between the particles on the value of T(g) is discussed by considering the effects of particle interactions on the blocking temperature. In this study we develop an effective blocking temperature model, and apply it to our system.

引用

页码：295 / 306

页数：12

共 35 条

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