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Elasticity of ilmenites

Authors:	Robert C Liebermann

Institution:	Research School of Earth Science, Australian National University, Canberra, A.C.T. Australia

Abstract:	Ultrasonic data for the velocities of the ilmenites MgTiO₃ and CoTiO₃ have been determined as a function of pressure to 7.5 kbar at room temperature for polycrystalline specimens hot-pressed in a piston-cylinder apparatus at pressures up to 30 kbar. Titanate and germanate ilmenites define divergent isostructural trends on a Birch diagram of bulk sound velocity (υ_φ) vs. density (ρ). On a υ_φ vs. mean atomic weight ( $M$ ) diagram, however, all of the ilmenite consistent with a single $υ_{φ} M^{12} = constant trend$ . Elasticity systematics for isostructural sequences are used to e the bulk modulus (2.09 Mbar) and bulk sound velocity (7.4 km/sec) of MgSiO₃-elmenite.

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