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Thermal expansion of forsterite up to the melting point
Author(s) -
Bouhifd M. A.,
Andrault D.,
Fiquet G.,
Richet P.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl01118
Subject(s) - forsterite , thermal expansion , melting point , materials science , thermodynamics , anharmonicity , bulk modulus , thermal , mineralogy , analytical chemistry (journal) , condensed matter physics , composite material , physics , geology , chemistry , chromatography
As determined from powder X‐ray diffraction experiments with synchrotron radiation, the thermal expansion coefficient of forsterite increases smoothly from 2.8 to 4.5 K −1 from 400 K to 2160 K. No anomalous increases of the cell parameters are observed near the melting point. The consistency between the observed and calculated value of the initial slope of the melting curve of forsterite suggests that defects do not make a large contribution to thermal expansion near the melting point. Along with previous results, the new data confirm the influence of anharmonicity on the high‐temperature heat capacity of forsterite and indicate that both the Grüneisen parameter and α K T (α = thermal expansion coefficient, K T = bulk modulus) have nearly constant values at high temperatures.