Study of ferrofluids by Mossbauer spectroscopy

被引：11

作者：

Pfannes, HD

Dias, JH

Lopez, JL

Pereira, SL

Morais, PC

Tourinho, FA

机构：

[1] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

[2] Univ Brasilia, Dept Fis, BR-70910 Brasilia, DF, Brazil

来源：

HYPERFINE INTERACTIONS | 1998年 / 113卷 / 1-4期

关键词：

D O I：

10.1023/A:1012616909485

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

The parameters of the log-normal size distribution of a MnFe2O4 ferrofluid powder sample have been determined by X-ray diffraction. The mean blocking temperature was determined from the maximum of chi(i)(T) Mossbauer spectra at 4.2-300 K are interpreted by a new simple theory of superparamagnetism and taking a reduction of the internal magnetic field for small particles, a size dependence of the anisotropy constant, the size distribution and collective excitations into account.

引用

页码：507 / 515

页数：9

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