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Synthesis of Superparamagnetic Magnesium Ferrite Nanoparticles by Microwave-Hydrothermal Method

Published online by Cambridge University Press:  21 March 2011

Seema Verma ,
Hari S. Potdar ,
Sadgopal K. Date  and
Pattayil A. Joy
Seema Verma
Affiliation:
Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India
Hari S. Potdar
Affiliation:
Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India
Sadgopal K. Date
Affiliation:
Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India
Pattayil A. Joy*
Affiliation:
Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India
*
Corresponding author. E-mail: [email protected]
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Abstract

Superparamagnetic magnesium ferrite, MgFe2O4, nanoparticles were synthesized under mild microwave hydrothermal (MH) conditions. Transmission electron microscopic studies showed that the average particle size of the ferrite obtained is ∼3 nm, with a narrow size distribution. Temperature dependent AC magnetic susceptibility measurements at 2 Oe showed characteristic feature of superparamagnetism with blocking temperature, TB, at 47 K. TB decreases with increasing DC magnetic field as evidenced by zero-field-cooled susceptibility studies at 50 and 500 Oe (TB = 38 and 27 K respectively). As a typical superparamagnetic behavior, the zero-field- cooled and the field-cooled magnetizations diverge below TB. Magnetic hysteresis behavior is observed below TB, with a high coercivity of 185 Oe at 12 K, and magnetic hysteresis behavior disappears when measured above TB. The results indicate that MH method is highly suitable for the synthesis of superparamagnetic ferrite nanoparticles of uniform size distribution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 818: Symposium M – Nanoparticles and Nanowire Building Blocks-Synthesis, Processing, Characterization and Theory , 2004 , M5.7.1
Copyright
Copyright © Materials Research Society 2004

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