Elastic properties of andradite and grossular, by synchrotron X-ray diffraction at high pressure conditions

Citation
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
Citations number
28
Categorie Soggetti
Earth Sciences
Journal title
EUROPEAN JOURNAL OF MINERALOGY
ISSN journal
09351221 → ACNP
Volume
13
Issue
5
Year of publication
2001
Pages
929 - 937
Database
ISI
SICI code
0935-1221(200109/10)13:5<929:EPOAAG>2.0.ZU;2-2
Abstract
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.