Synthesis of superparamagnetic Mn3O4 nanocrystallites by ultrasonic irradiation

被引：49

作者：

Gopalakrishnan, IK ^{[1
]}

Bagkar, N ^{[1
]}

Ganguly, R ^{[1
]}

Kulshreshtha, SK ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Novel Mat & Struct Chem Div, Bombay 400085, Maharashtra, India

来源：

JOURNAL OF CRYSTAL GROWTH | 2005年 / 280卷 / 3-4期

关键词：

ferrimagnet; superparamagnetism; ultrasonic irradiation; nanoparticles;

D O I：

10.1016/j.jcrysgro.2005.03.060

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Nanocrystalline Mn3O4 has been synthesized by ultrasonic irradiation of Mn acetate solution in water. Analysis of its X-ray diffraction data shows formation of a phase-pure compound with an average particle size of about 15 nm. DC magnetization measurements as a function of temperature and field show a reduced ferrimagnetic transition temperature (T-c approximate to 39 K) as compared to those reported for the bulk (T-c approximate to 43 K), and a subsequent observation of superparamagnetic behavior at 40 K. The observed magnetic properties are suggestive of formation of a single domain magnetically ordered Mn3O4 nanoparticles below their ferrimagnetic transition temperature. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：436 / 441

页数：6

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