Preparation of core shell particles consisting of cobalt ferrite and silica by sol-gel process

被引：74

作者：

Zhang, Shuping

Dong, Dawei

Sui, Yu

Liu, Zhiguo

Wang, Hongxia

Qian, Zhengnan

Su, Wenhui ^{[1
]}

机构：

[1] HeiLongJiang Prov Univ, Key Lab Condensed Matter Sci & Technol, Harbin Inst Technol, Harbin 150001, Peoples R China

[2] Jilin Univ, Grp Rare Earth Solid State Phys, Changchun 130023, Peoples R China

[3] Jilin Univ, Dept Phys, Changchun 130023, Peoples R China

[4] Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 415卷 / 1-2期

关键词：

sol-gel process; core shell particles; magnetic measurement; low temperature;

D O I：

10.1016/j.jallcom.2005.07.048

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：

Core shell particles consisting of a magnetic core of cobalt ferrite (CoFe2O4) and a shell of silica (SiO2) are prepared by sol-gel process using tetraethylorthosilicate (TEOS) as a precursor of silica, and metallic nitrates as precursors of ferrite. The core shell structure is confirmed by TEM. The magnetic proper-ties of these nanocomposites are measured by PPMS in low temperature and in different Co-ferrite content. The coercivity is clearly temperature dependent and the saturation magnetization increases with the Co-ferrite content. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：257 / 260

页数：4

共 10 条

[1] NONCOLLINEAR SPIN ARRANGEMENT IN ULTRAFINE FERRIMAGNETIC CRYSTALLITES [J].

COEY, JMD .

PHYSICAL REVIEW LETTERS, 1971, 27 (17) :1140-+

[2]

GWANG LJ, 1998, J APPL PHYS, V84, P2801

[3] Microstructural evolution and magnetic properties of NiFe2O4 nanocrystals dispersed in amorphous silica [J].

Li, LP ;

Li, GS ;

Smith, RL ;

Inomata, H .

CHEMISTRY OF MATERIALS, 2000, 12 (12) :3705-3714

[4] Ferromagnetic Co/SiO2 core/shell structured nanoparticles prepared by a novel aqueous solution method [J].

Lu, XG ;

Liang, GY ;

Sun, ZB ;

Zhang, W .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2005, 117 (02) :147-152

[5] Cobalt ferrite dispersed in a silica matrix prepared by sol-gel process [J].

Silva, J. B. ;

Diniz, C. F. ;

Ardinson, J. D. ;

Persiano, A. I. C. ;

Mohallem, N. D. S. .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2004, 272 :E1851-E1853

[6]

Venkateswara R.A., 1999, CERAM INT, V25, P505, DOI DOI 10.1016/S0272-8842(97)00085-0

[7] Core shell particles consisting of cobalt ferrite and silica as model ferrofluids [CoFe2O4-SiO2 core shell particles] [J].

Wagner, J ;

Autenrieth, T ;

Hempelmann, R .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 252 (1-3) :4-6

[8] Synthesis and characterization of CaCO3@SiO2 core-shell nanoparticles [J].

Zhang, SC ;

Li, XG .

POWDER TECHNOLOGY, 2004, 141 (1-2) :75-79

[9] Preparation of silica encapsulated CdSe quantum dots in aqueous solution with the improved optical properties [J].

Zhou, XP ;

Kobayashi, Y ;

Romanyuk, V ;

Ochuchi, N ;

Takeda, M ;

Tsunekawa, S ;

Kasuya, A .

APPLIED SURFACE SCIENCE, 2005, 242 (3-4) :281-286

[10] Nanocomposites of ZnFe2O4 in silica:: synthesis, magnetic and optical properties [J].

Zhou, ZH ;

Xue, JM ;

Chan, HSO ;

Wang, J .

MATERIALS CHEMISTRY AND PHYSICS, 2002, 75 (1-3) :181-185

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