Sol-gel preparation and characterization of CoFe2O4-SiO2 nanocomposites

被引：27

作者：

Huang, XH ^{[1
]}

Chen, ZH ^{[1
]}

机构：

[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2004年 / 132卷 / 12期

关键词：

chemical synthesis; silica; magnetic properties; ferrites;

D O I：

10.1016/j.ssc.2004.09.060

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetic nanocomposites formed by cobalt ferrite particles dispersed in a silica matrix were prepared by a sol-gel process. The effects of the thermal treatment temperature and the salt concentration on the structural and magnetic properties of the composites were investigated. By controlling these parameters, CoFe2O4/SiO2 nanocomposites with different crystallite size and magnetic properties were obtained. By increasing the annealing temperature and salt concentration, composites with a progressive increase in the coercive field and of the density of magnetization were produced. In particular, a nanocomposite, with a Fe/Si molar concentration of 21%, obtained by drying the gel at 150degreesC and further annealing at 800degreesC, has a coercivity of 2000 Oe, which is more than twice higher than the coercivity of bulk cobalt ferrite. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：845 / 850

页数：6

共 28 条

[21] Synthesis of high-coercivity cobalt ferrite particles using water-in-oil microemulsions [J].

Pillai, V ;

Shah, DO .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1996, 163 (1-2) :243-248

[22] Formation of nickel-zinc ferrite embedded in a silica xerogel matrix [J].

Ponce-Castañeda, S ;

Martínez, JR ;

Sánchez, SAP ;

Ruiz, F ;

Matutes-Aquino, JA .

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2002, 25 (01) :37-41

[23] Magnetic properties of nanocrystalline CoFe2O4 powders prepared at room temperature:: Variation with crystallite size [J].

Rajendran, M ;

Pullar, RC ;

Bhattacharya, AK ;

Das, D ;

Chintalapudi, SN ;

Majumdar, CK .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2001, 232 (1-2) :71-83

[24] INFRARED AND ELECTRONIC SPECTRA OF RARE EARTH PEROVSKITES - ORTHO-CHROMITES, ORTHO-MANGANITES AND ORTHO-FERRITES [J].

RAO, GVS ;

RAO, CNR ;

FERRARO, JR .

APPLIED SPECTROSCOPY, 1970, 24 (04) :436-&

[25] Particle size effects on magnetic garnets prepared by a properties of yttrium iron sol-gel method [J].

Sánchez, RD ;

Rivas, J ;

Vaqueiro, P ;

López-Quintela, MA ;

Caeiro, D .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 247 (01) :92-98

[26] MAGNETIC-PROPERTIES OF ULTRAFINE FERRITE PARTICLES [J].

SATO, T ;

IIJIMA, T ;

SEKI, M ;

INAGAKI, N .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1987, 65 (2-3) :252-256

[27] Sol-gel formation of γ-Fe2O3/SiO2 nanocomposites [J].

Solinas, S ;

Piccaluga, G ;

Morales, MP ;

Serna, CJ .

ACTA MATERIALIA, 2001, 49 (14) :2805-2811

[28] Nanophased CoFe2O4 prepared by combustion method [J].

Yan, CH ;

Xu, ZG ;

Cheng, FX ;

Wang, ZM ;

Sun, LD ;

Liao, CS ;

Jia, JT .

SOLID STATE COMMUNICATIONS, 1999, 111 (05) :287-291

← 1 2 3 →