Grain size effect on the phase transformation temperature of nanostructured CuFe2O4

Prabhu, D and Narayanasamy, A and Shinoda, K and Jeyadeven, B and Greneche, JM and Chattopadhyay, K (2011) Grain size effect on the phase transformation temperature of nanostructured CuFe2O4. In: Journal of Applied Physics, 109 (1). 013532-1.

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Abstract

We report a large decrease in tetragonal to cubic phase transformation temperature when grain size of bulk CuFe2O4 is reduced by mechanical ball milling. The change in phase transformation temperature was inferred from in situ high temperature conductivity and x-ray diffraction measurements. The decrease in conductivity with grain size suggests that ball milling has not induced any oxygen vacancy while the role of cation distribution in the observed decrease in phase transformation temperature is ruled out from in-field Fe-57 Mossbauer and extended x-ray absorption fine structure measurements. The reduction in the phase transformation temperature is attributed to the stability of structures with higher crystal symmetry at lower grain sizes due to negative pressure effect. (C) 2011 American Institute of Physics. doi: 10.1063/1.3493244]

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	07 Apr 2011 07:59
Last Modified:	07 Apr 2011 07:59
URI:	http://eprints.iisc.ac.in/id/eprint/36021

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