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Colloidal Particles: Spherical Yttrium Iron Garnet

Published online by Cambridge University Press:  10 February 2011

R.H.M. Godoi ,
M. Jafelicci Jr ,
R.F.C. Marques  and
L.C. Varanda
R.H.M. Godoi
Affiliation:
Universidade Estadual Paulista - Unesp, Departamento de Físico-Química, Araraquara, SP, Brasil. e-mail: godoi@iq.unesp.br
M. Jafelicci Jr
Affiliation:
Universidade Estadual Paulista - Unesp, Departamento de Físico-Química, Araraquara, SP, Brasil.
R.F.C. Marques
Affiliation:
Universidade Estadual Paulista - Unesp, Departamento de Físico-Química, Araraquara, SP, Brasil.
L.C. Varanda
Affiliation:
Universidade Estadual Paulista - Unesp, Departamento de Físico-Química, Araraquara, SP, Brasil.
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Abstract

The purpose of this work is to obtain spherical particles YIG from micrometric to nanometric scales. The spherical particles were obtained from cation hydrolysis in acid medium by adding urea or ammonia in order to carry out a homogeneous nucleation process up to 90°C. Different composition and morphology were achieved by changing reactant concentrations, precipitation agent and stabilizing agent. X-ray diffractometry, electrophoretic mobility, transmission and scanning electron microscopies were carried out on these particles to investigate the phase identification, mobility, morphology and particle size. Crystalline YIG, with spherical characteristics, was obtained. The surface potential presented different characteristics for different dispersion media.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 517: Symposium F – Wide Bandgap Semiconductors for High Power, High Frequency , January 1998 , 583
Copyright
Copyright © Materials Research Society 1998

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