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Anisotropic Thermal Expansion of Barium Hexaferrite Using Dynamic High-temperature X-ray Diffraction

Published online by Cambridge University Press:  31 January 2011

D. Sriram ,
R. L. Snyder  and
V. R. W. Amarakoon
D. Sriram
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, New York 14802
R. L. Snyder
Affiliation:
Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio 43210
V. R. W. Amarakoon
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, New York 14802
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Abstract

Barium hexaferrite is a well-known ceramic permanent magnet and due to its high coercivity, remanence, and large uniaxial magnetic anisotropy, finds applications that compete with metallic magnets. Even though a number of the high-temperature properties of barium hexaferrite have been studied extensively, its anisotropic thermal expansion has not been reported so far. Dynamic high-temperature x-ray diffraction (HT-XRD) is one powerful method to obtain thermal expansion data for anisotropic polycrystalline materials in a very short period of time. In this paper the anisotropic nature of the thermal expansion coefficient of the barium hexaferrite phase is reported with the use of a dynamic HT-XRD setup. The thermal expansion coefficient (linear fit) was determined to be 8.36 × 10−6 K−1 along the a–b plane to 1.4 × 10−5 K−1 along the c axis between the temperature range of 293 to 1343 K.

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Type
Articles
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Journal of Materials Research , Volume 15 , Issue 6 , June 2000 , pp. 1349 - 1353
Copyright
Copyright © Materials Research Society 2000

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