On the compressibility of ferrite spinels: A high-pressure X-ray diffraction study of MFe2O4 (M=Mg, Co, Zn)

E. Greenberg*, G. Kh Rozenberg, W. Xu, R. Arielly, M. P. Pasternak, A. Melchior, G. Garbarino, L. S. Dubrovinsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

High-pressure synchrotron X-ray diffraction studies were carried out on a series of ferrite spinels MFe2O4 (M=Mg, Co, Zn) up to ̃70GPa using diamond anvil cells. He and Ne, used as pressure media, provided quasi-hydrostatic conditions, resulting in a high-quality fit to both second- and third-order equations of state (EOSs). A quality fit to the second-order EOS allows a comparison between the compressibility of these spinels and that of other spinels found in the literature. Fitting to the second-order Birch-Murnaghan EOS results in the values of K0=170.5(8) , 176.1(6) and 174(2)GPa for M=Mg, Co and Zn, respectively. A linear dependence of K0 is obtained as a function of the normalized average cationic-sphere volume SN of each spinel with a slope of 490(15)GPa/Å3. A number of previous studies of the same and similar spinels exhibit a strong deviation from K0(SN), which can be attributed to a lack of hydrostatic conditions.

Original languageEnglish
Pages (from-to)764-779
Number of pages16
JournalHigh Pressure Research
Volume29
Issue number4
DOIs
StatePublished - Dec 2009

Funding

FundersFunder number
6th Framework Programme
Israeli Science Foundation36/05
Marie Curie Action for Early Stage Training of Researchers

    Keywords

    • Compressibility
    • Diamond anvil cell
    • Ferrite spinels
    • High pressure
    • Pressure media
    • X-ray diffraction

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