Abstract
Ultrasonic data for the velocities of the ilmenites MgTiO 3 and CoTiO 3 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 1 2 = 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 MgSiO 3-elmenite.
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