MAGNETIC-BEHAVIOR OF GAMMA-FE2O3 NANOPARTICLES BY MOSSBAUER-SPECTROSCOPY AND MAGNETIC MEASUREMENTS

被引：93
作者：
TRONC, E
PRENE, P
JOLIVET, JP
DORAZIO, F
LUCARI, F
FIORANI, D
GODINHO, M
CHERKAOUI, R
NOGUES, M
DORMANN, JL
机构：
[1] UNIV LAQUILA,DIPARTIMENTO FIS,I-67100 LAQUILA,ITALY
[2] CNR,MAT,IC,I-00016 MONTEROTONDO,ITALY
[3] FAC CIENCIAS LISBOA,LCMBT,P-1700 LISBON,PORTUGAL
[4] CNRS,MAGNETISME & MAT MAGNET LAB,F-92195 MEUDON,FRANCE
来源：
HYPERFINE INTERACTIONS | 1995年 / 95卷 / 1-4期
关键词：
D O I：
10.1007/BF02146310
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：
gamma-Fe2O3 nanoparticles with varying state of dispersion in a polymer have been investigated by Mossbauer spectroscopy, static magnetic measurements at low applied field, and alternative susceptibility measurements over a large range of frequencies (2 x 10(-2)-10(4) Hz). The dynamical behaviour was characterized through the variation of the blocking temperature with the characteristic time of the measurement. The Mossbauer blocking temperature was determined according to a procedure described. For quasi-isolated particles an Arrhenius law is demonstrated. Effects of interparticle interactions in concentrated and aggregated systems are satisfactorily explained by the previous model. Dependence of the superparamagnetic susceptibility on the experimental conditions interpreted using the Lorentz or Onsager fields is mentioned.
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收藏
页码：129 / 148
页数：20
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