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Formation of LuFe2O4 phase from an undercooled LuFeO3 melt in reduced oxygen partial pressure

Published online by Cambridge University Press:  31 January 2011

M.S. Vijaya Kumar ,
Kazuhiko Kuribayashi  and
Koichi Kitazono
M.S. Vijaya Kumar*
Affiliation:
Department of Aerospace Engineering, Tokyo Metropolitan University, Hino, Tokyo 191-0065, Japan; and Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa 229-8510, Japan
Kazuhiko Kuribayashi
Affiliation:
Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa 229-8510, Japan
Koichi Kitazono
Affiliation:
Department of Aerospace Engineering, Tokyo Metropolitan University, Hino, Tokyo 191-0065, Japan
*
a)Address all correspondence to this author. e-mail: vijaykumar@isas.jaxa.jp
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Abstract

The formation of metastable phases from an undercooled LuFeO3 melt was investigated under reduced Po2 since the iron ion has the tendency to change its valence state from Fe3+ to Fe2+ in an ambient atmosphere with low Po2. The nucleation and the post-recalescence temperatures of the phases were decreased with decreasing process Po2. Phase equilibrium was established in the Lu–Fe–O system at 1473 K by varying the oxygen partial pressure from 105 to 10−1 Pa. A possible ternary metastable phase diagram depending on the oxygen composition in the bulk sample was also constructed. The formation of the LuFe2O4 phase where the Fe3+ and Fe2+ ratio is 1:1 clearly indicated that the formation of metastable phases is related to the presence of Fe2+ ions. Thermogravimetric analysis revealed that the increase in sample mass with decreasing process Po2, down to 10−1 Pa, is relatively dependent on the amount of Fe2+ ions.

Keywords

LuPhase equilibriaRapid solidification
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 11 , November 2008 , pp. 2996 - 3005
Copyright
Copyright © Materials Research Society 2008

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References

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