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Title: Atomic migration in CoGa{sub x}Fe{sub 2{minus}x}O{sub 4}

Abstract

Co-Ga ferrite has been studied with x-ray diffraction, vibrating sample magnetometer and Moessbauer spectroscopy. The crystal structure for this system is spinel, and lattice constants is in accord with vegard's law. The Neel temperature decreases linearly with Ga concentration, suggesting the superexchange interaction Co-O-Fe link is stronger than that for the Ga-O-Fe link. Atomic migration of CoGa{sub 0.1}Fe{sub 1.9}O{sub 4} starts near 350 K and increases rapidly with increasing temperature to such a degree that 73% of the ferric ions as the A sites have moved to the B site by 700 K. The temperature dependence of the magnetic hyperfine field and magnetization of CoGa{sub 0.1}Fe{sub 1.9}O{sub 4} is explained by the Neel theory of ferrimagnetism using three superexchange integrals: J{sub AB} = -11.5 k{sub g}, J{sub AA} = 9.8 k{sub g}, J{sub BB} = 21.3 k{sub g}.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Chungbuk National Univ., Cheongju (KR)
OSTI Identifier:
20000783
Alternate Identifier(s):
OSTI ID: 20000783
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)
Additional Journal Information:
Journal Volume: 35; Journal Issue: 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; Journal ID: ISSN 0018-9464
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT OXIDES; GALLIUM OXIDES; IRON OXIDES; CRYSTAL STRUCTURE; LATTICE PARAMETERS; NEEL TEMPERATURE; TEMPERATURE DEPENDENCE; ATOM TRANSPORT; MAGNETIZATION; MAGNETIC PROPERTIES

Citation Formats

Lee, S.W., Kim, D.H., Hong, S.R., Kim, S.J., Kim, W.C., Kim, S.B., and Kim, C.S. Atomic migration in CoGa{sub x}Fe{sub 2{minus}x}O{sub 4}. United States: N. p., 1999. Web. doi:10.1109/20.800543.
Lee, S.W., Kim, D.H., Hong, S.R., Kim, S.J., Kim, W.C., Kim, S.B., & Kim, C.S. Atomic migration in CoGa{sub x}Fe{sub 2{minus}x}O{sub 4}. United States. doi:10.1109/20.800543.
Lee, S.W., Kim, D.H., Hong, S.R., Kim, S.J., Kim, W.C., Kim, S.B., and Kim, C.S. Wed . "Atomic migration in CoGa{sub x}Fe{sub 2{minus}x}O{sub 4}". United States. doi:10.1109/20.800543.
@article{osti_20000783,
title = {Atomic migration in CoGa{sub x}Fe{sub 2{minus}x}O{sub 4}},
author = {Lee, S.W. and Kim, D.H. and Hong, S.R. and Kim, S.J. and Kim, W.C. and Kim, S.B. and Kim, C.S.},
abstractNote = {Co-Ga ferrite has been studied with x-ray diffraction, vibrating sample magnetometer and Moessbauer spectroscopy. The crystal structure for this system is spinel, and lattice constants is in accord with vegard's law. The Neel temperature decreases linearly with Ga concentration, suggesting the superexchange interaction Co-O-Fe link is stronger than that for the Ga-O-Fe link. Atomic migration of CoGa{sub 0.1}Fe{sub 1.9}O{sub 4} starts near 350 K and increases rapidly with increasing temperature to such a degree that 73% of the ferric ions as the A sites have moved to the B site by 700 K. The temperature dependence of the magnetic hyperfine field and magnetization of CoGa{sub 0.1}Fe{sub 1.9}O{sub 4} is explained by the Neel theory of ferrimagnetism using three superexchange integrals: J{sub AB} = -11.5 k{sub g}, J{sub AA} = 9.8 k{sub g}, J{sub BB} = 21.3 k{sub g}.},
doi = {10.1109/20.800543},
journal = {IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)},
issn = {0018-9464},
number = 5Pt2,
volume = 35,
place = {United States},
year = {1999},
month = {9}
}