A. Pavese et al., Elastic properties of andradite and grossular, by synchrotron X-ray diffraction at high pressure conditions, EUR J MINER, 13(5), 2001, pp. 929-937
The bulk elastic properties of natural andradite and grossular have been in
vestigated by synchrotron radiation powder diffraction at high pressure con
ditions, up to 37 GPa, on the ID9 beamline (ESRF). The P-V data have been i
nterpolated by the Birch-Murnaghan EOS and the Vinet EOS, and the bulk modu
lus and its first derivative versus P determined. The results obtained by t
he different EOS models are compared with one another, and with earlier iss
ues. For andradite and grossular the Birch-Murnaghan EOS yields K-0 = 158.5
(+/-1.0) GPa and K'(0) = 5.77(+/-0.10) [K"(0)=-0.056 GPa(-1) implied value]
, and K-0 = 169.3(+/-1.2) and K'(0)=5.92(+/-0.14) [K"(0)=-0.056 GPa(-1) imp
lied value], respectively. The elastic properties here reported are compare
d with previous issues. The cell edge compressibilities, which have been de
termined by fitting the experimental lattice parameters with polynomials in
P, are beta (a) = 0.00208(2) GPa(-1), for andradite, and beta (a) = 0.0019
4(3) GPa(-1), for grossular.