Effect of SiO2 coating on the magnetic properties of Ni-Zn ferrite

被引：10

作者：

Zhou, Bo ^{[1
]}

Liu, Zhiguo ^{[1
]}

Wang, Xianjie ^{[1
]}

Sui, Yu ^{[1
]}

Huang, Xiqiang ^{[1
]}

Lue, Zhe ^{[1
]}

Su, Wenhui ^{[1
,2
]}

机构：

[1] Harbin Inst Technol, Ctr Condensed Matter Sci & Technol, Dept Phys, Harbin 150080, Peoples R China

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

来源：

PHYSICA B-CONDENSED MATTER | 2010年 / 405卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Ni-Zn ferrite; Stober method; Core-shell nanocomposites; Magnetism; NANOPARTICLES; GEL; SURFACE;

D O I：

10.1016/j.physb.2009.08.087

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The Ni-Zn ferrite/SiO2 nanocomposites (ZNF/SiO2 NCs) with core-shell structure were synthesized using Stober method and a modified one. The core-shell structure was confirmed by transmission electron spectroscopy (TEM). The product obtained by modified Stober method was more uniform than by Stober method. The strength of dipole-dipole interaction between Ni-Zn nanoparticles decreases and the coordination of surface atoms increases due to surface modification. The decrease of blocking temperature and coercivity of the magnetic particles at low temperature can be attributed to the coating Of SiO2, which weakens the surface spin disorder of magnetic nanoparticles. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：374 / 378

页数：5

共 24 条

[1] Controlled hydrolysis of tetraethoxysilane in a nonionic water-in-oil microemulsion: a statistical model of silica nucleation [J].

Arriagada, FJ ;

Osseo-Asare, K .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1999, 154 (03) :311-326

[2] Finite-size effects in fine particles: magnetic and transport properties [J].

Batlle, X ;

Labarta, A .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2002, 35 (06) :R15-R42

[3] Quantitative IR spectroscopy: Applications to studying glass structure and properties [J].

Efimov, AM .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1996, 203 :1-11

[4] VIBRATIONAL DYNAMICS IN SI-30-SUBSTITUTED VITREOUS SIO2 [J].

GALEENER, FL ;

GEISSBERGER, AE .

PHYSICAL REVIEW B, 1983, 27 (10) :6199-6204

[5] Influence of dipolar interaction on magnetic properties of ultrafine ferromagnetic particles [J].

García-Otero, J ;

Porto, M ;

Rivas, J ;

Bunde, A .

PHYSICAL REVIEW LETTERS, 2000, 84 (01) :167-170

[6] Synthesis and magnetic characterization of zinc ferrite nanoparticles with different environments: Powder, colloidal solution, and zinc ferrite-silica core-shell nanoparticles [J].

Grasset, F ;

Labhsetwar, N ;

Li, D ;

Park, DC ;

Saito, N ;

Haneda, H ;

Cador, O ;

Roisnel, T ;

Mornet, S ;

Duguet, E ;

Portier, J ;

Etourneau, J .

LANGMUIR, 2002, 18 (21) :8209-8216

[7] Estimation of blocking temperatures from ZFC/FC curves [J].

Hansen, MF ;

Morup, S .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 203 :214-216

[8] Preparation and properties of silica-coated cobalt nanoparticles [J].

Kobayashi, Y ;

Horie, M ;

Konno, M ;

Rodríguez-González, B ;

Liz-Marzán, LM .

JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (30) :7420-7425

[9] Infrared properties of silicon nanoparticles [J].

Kravets, VG ;

Meier, C ;

Konjhodzic, D ;

Lorke, A ;

Wiggers, H .

JOURNAL OF APPLIED PHYSICS, 2005, 97 (08)

[10] 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

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