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Unusual structure in vitreous forsterite synthesized by an aero-acoustic levitation technique

Kohara, Shinji*; Suzuya, Kentaro; Takeuchi, Ken*

Forsterite Mg$$_{2}$$SiO$$_{4}$$ exhibits an orthorhombic structure consisted of two kinds of MgO$$_{6}$$ octahedra. Given only 33.3 mol% of SiO$$_{2}$$ in the material, the SiO$$_{4}$$ tetrahedra are isolated within the framework, sharing the O-O bonds with the common edges of the MgO$$_{6}$$ octahedra. If forsterite can be vitrified, an interesting question concerning the glass structure arises because there is insufficient glass forming SiO$$_{2}$$ to establish the corner-sharing SiO$$_{4}$$ tetrahedral network needed in conventional silicate glasses. A bulk Mg$$_{2}$$SiO$$_{4}$$ glass was synthesized using an aero-acoustic levitation technique and to determine the short- to intermediate-range structure by a combined high-energy X-ray and neutron diffraction and reverse Monte Carlo computer simulation. Interestingly, we found that the role of network former is largely taken on by corner- and edge-sharing ionic magnesium species that adopt 4-, 5- and 6-coordination with oxygen.

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