High-pressure x-ray diffraction and Raman spectroscopic studies of the tetragonal spinel CoFe2O4

Zhongwu Wang, Robert T Downs, V. Pischedda, R. Shetty, S. K. Saxena, C. S. Zha, Y. S. Zhao, D. Schiferl, A. Waskowska

Research output: Contribution to journalArticle

Abstract

In situ x-ray diffraction and Raman spectroscopy have been carried out to pressures of 93.6 and 63.2 GPa, respectively, to explore the pressure-induced phase transformation of CoFe2O4 spinel. CoFe 2O4 adopts a distorted tetragonal spinel structure at one atmosphere. At a pressure of ∼32.5 GPa, both x-ray diffraction and Raman spectroscopy indicate that CoFe2O4 transforms to the orthorhombic CaFe2O4 structure, which remains stable to at least 93.6 GPa. The bulk modulus (K0) of the tetragonal and the high-pressure polymorphs were calculated to be 94(12) and 145(16) GPa, respectively, with K′ ≡ 4. Upon release of pressure the orthorhombic phase persists and appears to be structurally metastable. At zero pressure, laser induced heating leads to a significant transformation back to the tetragonal phase. The high-pressure orthorhombic phase at one atmosphere is 14.7% denser than the tetragonal phase.

Original languageEnglish (US)
Article number094101
Pages (from-to)941011-941016
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number9
StatePublished - Sep 2003

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Wang, Z., Downs, R. T., Pischedda, V., Shetty, R., Saxena, S. K., Zha, C. S., Zhao, Y. S., Schiferl, D., & Waskowska, A. (2003). High-pressure x-ray diffraction and Raman spectroscopic studies of the tetragonal spinel CoFe2O4. Physical Review B - Condensed Matter and Materials Physics, 68(9), 941011-941016. [094101].