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Aerosol synthesis of gadolinium iron garnet particles

Published online by Cambridge University Press:  31 January 2011

H.K. Xu ,
C.M. Sorensen ,
K.J. Klabunde  and
G.C. Hadjipanayis
H.K. Xu
Affiliation:
Departments of Physics and Chemistry, Kansas State University, Manhattan, Kansas 66506
C.M. Sorensen
Affiliation:
Departments of Physics and Chemistry, Kansas State University, Manhattan, Kansas 66506
K.J. Klabunde
Affiliation:
Departments of Physics and Chemistry, Kansas State University, Manhattan, Kansas 66506
G.C. Hadjipanayis
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716
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Abstract

Particles of gadolinium iron garnet, Gd3Fe5O12, were produced primarily by an aerosol spray pyrolysis technique starting with solutions of gadolinium and iron nitrates. The as-prepared particles were polydisperse solid spheres. Average diameters in the range 0.05 to 0.8 μ could be obtained by variation of the initial solution concentration. Larger particles to 2 μ were created by direct, non-aerosol, pyrolysis of the solutions. Heat treatment caused sintering and particle coalescence and yielded ∼95% garnet phase. The reaction time to create the garnet phase scaled with the square of the particle diameter, the smallest particles transforming the quickest. Magnetic measurements showed bulk behavior for the saturation magnetization, but the coercivity could be varied with particle size with a maximum near the single domain size.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 3 , March 1992 , pp. 712 - 716
Copyright
Copyright © Materials Research Society 1992

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