Measurement of the high-frequency complex permittivity and conductivity of magnetic fluids

被引：16

作者：

Fannin, PC ^{[1
]}

Charles, SW

Vincent, D

Giannitsis, AT

机构：

[1] Univ Dublin Trinity Coll, Dept Elect & Elect Engn, Dublin 2, Ireland

[2] Univ Coll N Wales, Dept Chem, Bangor LL57 2UW, Gwynedd, Wales

[3] Univ St Etienne, DIOM, F-42023 St Etienne 2, France

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2002年 / 252卷 / 1-3期

关键词：

magnetic fluids; permittivity; conductivity;

D O I：

10.1016/S0304-8853(02)00604-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Measurements of the permittivity, epsilon(w) = iepsilon"(w) - and conductivity, sigma(w) = wepsilon(0)epsilon"(w), of two ferrofluid samples of ferrite particles in a hydrocarbon carrier, isopar M, over the frequency range 0.1-6 GHz are presented. It is shown that the sample with the highest concentration of particles has the highest permittivity and by means of profile fitting it is demonstrated, for the first time, that sigma(w) has a Debye-type profile. The frequency limitation of the used measurement technique is highlighted and a possible alternative technique capable of measuring in the 20-30 GHz region is presented. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：80 / 82

页数：3