Grain size effect on the phase transformation temperature of nanostructured CuFe2O4

D. Prabhu, A. Narayanasamy, K. Shinoda, B. Jeyadeven, J. M. Greneche, K. Chattopadhyay

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26 Citations (Scopus)

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 57Fe Mössbauer 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.

Original languageEnglish
Article number013532
JournalJournal of Applied Physics
Volume109
Issue number1
DOIs
Publication statusPublished - 2011 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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