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Science 3 April 1987:
Vol. 236. no. 4797, pp. 64 - 65
DOI: 10.1126/science.236.4797.64
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Articles

Phonon Density of States and Specific Heat of Forsterite, Mg2SiO4

K. R. RAO 1, S. L. CHAPLOT 1, NARAYANI CHOUDHURY 1, SUBRATA GHOSE 2, and D. L. PRICE 3

1 Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Bombay 400 085, India.
2 Mineral Physics Group, Department of Geological Sciences, University of Washington, Seattle, WA 98195.
3 Materials Science Division, Argonne National Laboratory, Argonne, IL 60439.

The phonon density of states of the geophysically important mineral forsterite has been calculated with a rigid-ion model, which gives good agreement with an experimental measurement by inelastic neutron scattering. The density of states has been used to calculate the specific heat as a function of temperature, the results of which are in excellent agreement with calorimetrically measured values. The rigid-ion model takes account of the interatomic interactions and normal modes of vibration on a detailed microscopic basis, and is therefore more realistic than the Debye and other empirical models used previously.

Submitted on September 15, 1986
Accepted on February 10, 1987


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Inelastic neutron scattering and lattice dynamics of minerals.
S. L. CHAPLOT, N. CHOUDHURY, S. GHOSE, M. N. RAO, R. MITTAL, and P. GOEL (2002)
European Journal of Mineralogy 14, 291-329
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Science. ISSN 0036-8075 (print), 1095-9203 (online)