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Size-dependence of Magnetic Properties of Bismuth Ferrite Nanopowders

Published online by Cambridge University Press:  21 March 2011

J. Li ,
H. He ,
F. Lü ,
Y. Duan  and
D. Song
J. Li
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, China.
H. He
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, China.
F. Lü
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, China.
Y. Duan
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, China.
D. Song
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, China.
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Abstract

A series of BiFeO3 nanopowders were prepared by the sol-gel process. X-ray diffraction analysis shows that their rhombohedral crystal symmetry remains unchanged. However, as the particle size decreases, the edge length of the unit cell increases markedly and the angle between the edges deviates increasingly from 60°. Magnetic measurements show obvious weak ferromagnetism. The magnetization and magnetic susceptibility increase with decreasing particle size. Mössbauer studies reveal that the spin canting angles in the smaller particles are bigger and have a wider distribution. The magnetic structure in these particles is a complicated uncompensated antiferromagnetic spin arrangement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y7.7
Copyright
Copyright © Materials Research Society 2001

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References

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