000169086 001__ 169086
000169086 005__ 20180913060820.0
000169086 02470 $$2ISI$$aA1997WQ14100003
000169086 037__ $$aCONF
000169086 245__ $$aAnharmonic properties of Mg2SiO4-forsterite measured from the volume dependence of the Raman spectrum
000169086 269__ $$a1997
000169086 260__ $$c1997
000169086 336__ $$aConference Papers
000169086 520__ $$aThe effect of temperature on the Raman spectrum of Mg2SiO4-forsterite is investigated between 100 and 2000 K. The data, combined with those obtained at high pressure, are used to discuss the intrinsic anharmonicity of the Raman-active modes. Anharmonicity of a mode of frequency v(i) is measured through a parameter (a(i)) = (partial derivative ln v(i)/partial derivative T)(v) calculated from the measured temperature and pressure shifts of the vibrational frequency. In forsterite, these parameters are negative, of the order of -10(-5) K-1. Those related to the internal modes of the SiO4 tetrahedra are significantly different (-0.5 10(-5) K-1) from those of the lattice modes (-3 10(-5) K-1). Because of the large temperature range investigated in this study, the temperature and volume dependencies of the a(i) parameters could be estimated for the first time in a mineral, and are shown to be negligible, at least up to 2000 K. The significant non-zero values of the al parameters combined with their small volume dependencies imply that intrinsic anharmonicity in forsterite contributes significantly to entropies and specific heats, even at high pressures, but has negligible effects on thermal pressure and high-temperature equations of state.
000169086 6531_ $$aforsterite
000169086 6531_ $$aRaman spectroscopy
000169086 6531_ $$ahigh-temperature experiments
000169086 6531_ $$aequations of state
000169086 6531_ $$aanharmonicity
000169086 6531_ $$aHigh-Pressure
000169086 6531_ $$aTemperature
000169086 6531_ $$aSpectroscopy
000169086 6531_ $$aForsterite
000169086 6531_ $$aMinerals
000169086 700__ $$aDaniel, I.
000169086 700__ $$aGuyot, F.
000169086 700__ $$0244692$$aGillet, P.$$g199993
000169086 7112_ $$a6th International Symposium on Experimental Mineralogy, Petrology and Geochemistry (EMPG-VI)$$cBAYREUTH, GERMANY$$dApr 10-13, 1996
000169086 773__ $$j9$$q255-262$$tEuropean Journal Of Mineralogy
000169086 909C0 $$0252407$$pEPSL
000169086 909c0 $$xU12330
000169086 909CO $$ooai:infoscience.tind.io:169086$$pconf$$pSB
000169086 937__ $$aEPFL-CONF-169086
000169086 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED
000169086 980__ $$aCONF