Compressibility of calcium ferrite-type MgAl2O4 |
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| Authors: | Mina Yutani Takehiko Yagi Hitoshi Yusa Tetsuo Irifune |
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| Institution: | (1) Institute for Solid State Physics, University of Tokyo, 7-22-1, Roppngi, Minato-ku, Tokyo 106, Japan, JP;(2) Department of Earth Science, Faculty of Science, Ehime University, 2-5, Bunkyo-cho, Matsuyama 790, Japan, JP |
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| Abstract: | In situ X-ray diffraction experiments of calcium ferrite-type MgAl2O4 have been carried out using a diamond anvil cell combined with synchrotron radiation and an imaging plate X-ray detector
under hydrostatic pressures up to 9 GPa. The observed unit-cell volumes at various pressures were fitted to the Birch-Murnaghan
equation of state, yielding a bulk modulus of K
T
0= 241(3) GPa when K′
T
0=4 is assumed. This relatively large bulk modulus of calcium ferrite-type MgAl2O4 is consistent with that expected from the systematic relation between bulk modulus and molar volume for the most compounds
possessing fcc oxygen packing.
Received March 5, 1996/Revised, accepted October 15, 1996 |
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