Abstract
The crystal structure of perovskite-type MgSiO3 has been studied up to 96 kbar, using a miniature diamondanvil pressure cell and by means of single-crystal four-circle diffractometry. The observed unit cell compression gives a bulk modulus of K o=2.47 Mbar, assuming K′o=4. The unit cell compression is controlled mainly by the tilting of SiO6 octahedra. The effect of pressure is to change Mg polyhedron towards 8-fold coordination rather than 12-fold coordination. The polyhedral bulk moduli of SiO6 and MgO8 are 3.8 Mbar and 1.9 Mbar, respectively.
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Kudoh, Y., Ito, E. & Takeda, H. Effect of pressure on the crystal structure of perovskite-type MgSiO3 . Phys Chem Minerals 14, 350–354 (1987). https://doi.org/10.1007/BF00309809
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DOI: https://doi.org/10.1007/BF00309809