Low-temperature heat capacity of monoclinic enstatite |
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| Authors: | V. A. Drebushchak Yulia A. Kovalevskaya I. E. Paukov N. V. Surkov |
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| Affiliation: | (1) Institute of Geology and Mineralogy SB RAS, Pr. Ak. Koptyuga, 3, Novosibirsk, 630090, Russia;(2) Institute of Inorganic Chemistry SB RAS, Pr. Ak. Lavrentieva, 3, Novosibirsk, 630090, Russia;(3) ‘Molecular Design and Ecologically Safe Technologies’ REC-008, Novosibirsk State University, Ul. Pirogova 2, Novosibirsk, 630090, Russia |
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| Abstract: | Synthetic enstatite MgSiO3 was crystallized from a melt, quenched into water, and then annealed at 873 K. The product is the monoclinic polymorph with the unit cell parameters of a=0.9619(7), b=0.8832(3), c=0.5177(4) nm, β=108.27(5)°. Heat capacity was measured from 6 to 305 K using an adiabatic vacuum calorimeter. Thermodynamic functions for clinoenstatite differ by about 5% from those predicted after a thermodynamic model in the literature, but are very close to those measured for orthorhombic enstatite. |
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| Keywords: | enstatite heat capacity MgSiO3 polymorphs |
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