ScAlO3 is a close structural analogue for MgSiO3-perovskite in terms of its molar volume, structural distortion and compressional behavior. Polycrystalline specimens of ScAlO3 were synthesized in a 1000-ton multi anvil press at 10 GPa, 1470 K from two different starting materials; amorphous ScAlO3 and mixed oxides. Two well-sintered and fully-transformed specimens were recovered with low porosities of 0.5 and 1.7%. Elastic wave-speeds of these two specimens have been determined up to 3 GPa at room temperature. The results indicate that for these specimens, partial differential K/partial differential P = 3.8 and partial differential G/partial differential P = 1.9. The pressure derivatives of elastic moduli for the polycrystalline ScAlO3 specimens are expected to be reliable within 10% using this well-established ultrasonic technique. This is demonstrated by comparing determinations of the elasticity of polycrystalline Al2O3 with the available single crystal data. The values of partial differential M/partial differential P of ScAlO3 are consistent with those determined for MgSiO3 perovskite from X-ray P-V study and ultrasonic measurement.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Physics and Astronomy (miscellaneous)
- Space and Planetary Science