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 language | English |
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Pages (from-to) | 764-779 |
Number of pages | 16 |
Journal | High Pressure Research |
Volume | 29 |
Issue number | 4 |
DOIs | |
State | Published - Dec 2009 |
Keywords
- Compressibility
- Diamond anvil cell
- Ferrite spinels
- High pressure
- Pressure media
- X-ray diffraction