Vitreous forsterite (Mg2SiO4): Synthesis, structure, and thermochemistry
Geophysical Research Letters2001Vol. 28(13), pp. 2517–2520
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Jean A. Tangeman, Brian L. Phillips, Alexandra Navrotsky, J. K. Richard Weber, April D. Hixson, Thomas S. Key
Abstract
Here we report the first synthesis of a forsterite (Mg 2 SiO 4 ) 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 Mg 2 SiO 4 droplets in oxygen at 700 K/s. 29 Si NMR spectroscopic data indicate that the SiO 4 tetrahedra and MgO 6 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±1.3 kJ/mol higher in enthalpy than the crystal.
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