High pressure elastic behavior of synthetic Mg3Y 2(SiO4)3 garnet up to 9 GPa

Abstract

The compression behavior of synthetic magnesium- (Mg-) yttrium (Y) garnet Mg3Y2(SiO4)3 has been investigated upto about 8.79 GPa at 300 K using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at the beamline X17C, National Synchrotron Light Source, Brookhaven National Laboratory. No phase transition has been observed within the pressure range investigated. The unit-cell parameters and volume decreased systematically with increasing pressure, and a reliable isothermal bulk modulus (K T 0) and its pressure derivative (K T 0 ′) were obtained in this study. The values of zero-pressure volume V 0, K 0, and K 0 ′ refined with a third-order Birch-Murnaghan equation of state are V 0 = 1727.9 ± 0.2 Å3, K T 0 = 145 ± 3 GPa, and K 0 ′ = 8.5 ± 0.9. If K T 0 ′ is fixed at 4, K T 0 is obtained as 158 ± 2 GPa. © 2013 Dawei Fan et al.