Vitreous forsterite (Mg2SiO4): Synthesis, structure, and thermochemistry

Details Vitreous forsterite (Mg2SiO4): Synthesis, structure, and thermochemistry Vitreous forsterite (Mg2SiO4): Synthesis, structure, and thermochemistry

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2517t&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 13, p. 2517-2520

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22

Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Igneous Petrology, Mineral Physics: Nmr, Mossbauer Spectroscopy, And Other Magnetic Techniques, Mineral Physics: Physical Thermodynamics

Scientific paper

Here we report the first synthesis of a forsterite (Mg2SiO4) composition glass as an essentially phase-pure bulk material. Under containerless conditions, with heterogeneous nucleation sites minimized, glass forms by cooling ca. 1 mm liquid Mg2SiO4 droplets in oxygen at 700 K/s. 29SiNMR spectroscopic data indicate that the SiO4 tetrahedra and MgO6 octahedra exist in a corner sharing arrangement in the glass, but upon crystallization the polyhedral units reorganize to form edge-sharing linkages. Transposed temperature drop calorimetry shows that the glass is 61.4+/-1.3kJ/mol higher in enthalpy than the crystal.

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