The thermoelastic parameters of natural andradite and grossular have been investigated by high-pressure and -temperature synchrotron X-ray powder diffraction, at ESRF, on the ID30 beamline. The P-V-T data have been fitted by Birch-Murnaghan-like EOSs, using both the approximated and the general form. We have obtained for andradite Ko = 158.0(±1.5) GPa, (dK/dT)o = -0.020(3) GPa K-1 and αo = 31.6(2) 10-6 K-1, and for grossular Ko = 168.2(±1.7) GPa, (dK/dT)o = -0.016(3) GPa K-1 and αo = 27.8(2) 10-6 K-1. Comparisons between the present issues and thermoelastic properties of garnets earlier determined are carried out.
Pressure-Volune-Temperature equation of state of andradite and grossular, by high pressure and temperature powder diffraction / A. Pavese, V. Diella, V. Pischedda, M. Merli, R. Bocchio, M. Mezouar. - In: PHYSICS AND CHEMISTRY OF MINERALS. - ISSN 0342-1791. - 28:4(2001), pp. 242-248. [10.1007/s002690000144]
Pressure-Volune-Temperature equation of state of andradite and grossular, by high pressure and temperature powder diffraction
A. PavesePrimo
;R. BocchioPenultimo
;
2001
Abstract
The thermoelastic parameters of natural andradite and grossular have been investigated by high-pressure and -temperature synchrotron X-ray powder diffraction, at ESRF, on the ID30 beamline. The P-V-T data have been fitted by Birch-Murnaghan-like EOSs, using both the approximated and the general form. We have obtained for andradite Ko = 158.0(±1.5) GPa, (dK/dT)o = -0.020(3) GPa K-1 and αo = 31.6(2) 10-6 K-1, and for grossular Ko = 168.2(±1.7) GPa, (dK/dT)o = -0.016(3) GPa K-1 and αo = 27.8(2) 10-6 K-1. Comparisons between the present issues and thermoelastic properties of garnets earlier determined are carried out.
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