MOSSBAUER STUDY OF SMALL-PARTICLE MAGHEMITE

被引：40

作者：

DEBAKKER, PMA ^{[1
]}

DEGRAVE, E ^{[1
]}

VANDENBERGHE, RE ^{[1
]}

BOWEN, LH ^{[1
]}

机构：

[1] N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695

来源：

HYPERFINE INTERACTIONS | 1990年 / 54卷 / 1-4期

关键词：

D O I：

10.1007/BF02396078

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：

Two small-particle maghemite (λ-Fe2O3) samples have been investigated with the Mössbauer effect. From the results of the model-independent hyperfine-field distribution fits some characteristic temperature-dependent parameters have been obtained. The spectra at the lowest temperatures could be fitted with two strongly overlapping hyperfine-field distributions with different isomer shifts. Spectra in applied magnetic fields ranging from 40 to 60 kOe, and at 4.2 K showed non vanishing Δm1=0 absorption lines. The hyperfine-field distribution and canting-angle distribution method for fitting these spectra did not yield reasonable results. Therefore, a bi-dimensional hyperfine-field-canting-angle distribution has been applied, and was found to reproduce the experimental line shapes with remarkable adequacy. The resulting distribution profiles revealed a linear correlation between Hhf and the angle between the magnetic moments and the external field. © 1990 J.C. Baltzer A.G. Scientific Publishing Company.

引用

页码：493 / 498

页数：6

共 12 条

[1]

[Anonymous], [No title captured]

[2] INFLUENCE OF CRYSTALLITE SIZE ON MAGNETIC PROPERTIES OF ACICULAR GAMMA-FE2O3 PARTICLES [J].