Mossbauer investigation of γ-Fe2O3 nanocrystals in silica matrix prepared by the sol-gel method

被引：0
作者：
Cannas, C
Concas, G
Congiu, F
Musinu, A
Piccaluga, G
Spano, G
机构：
[1] Univ Cagliari, Dipartimento Fis, I-09042 Cagliari, Italy
[2] INFM, I-09042 Cagliari, Italy
[3] Univ Cagliari, Dipartimento Sci Chim, I-09042 Cagliari, Italy
来源：
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES | 2002年 / 57卷 / 3-4期
关键词：
nanostructures; oxides; sol-gel growth; Mossbauer spectroscopy; magnetic properties;
D O I：
暂无
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of Fe2O3-SiO2 nnocomposites (25 weight % of Fe2O3) has been prepared using a sol-gel method, Samples showing different features were obtained by varying the evaporation conditions acting on the surface / volume ratio of the starting sol. The samples were investigated using Mossbauer spectroscopy at low temperature. The Fe2O3 nanoparticles have been identified as maghemite (gamma-Fe2O3) particles. The samples show a superparamagnetic behavior with a blocking temperature that depends on the average particle size.
引用
收藏
页码：154 / 158
页数：5
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