Coordination changes in magnesium silicate glasses

  title={Coordination changes in magnesium silicate glasses},
  author={Martin C. Wilding and Chris J. Benmore and Jean A. Tangeman and Sujatha Sampath},
Glasses made from the magnesium silicate minerals enstatite (MgSiO3) and forsterite (Mg2SiO4) and three intermediate compositions can be considered as analogues of quenched melts from the Earth and Lunar mantle. Combined neutron and X-ray diffraction data show an abrupt change in glass structure in the narrow compositional range 38% SiO2 to 33% SiO2 (Mg2SiO4). These structural changes reflect a change from a glass characterized by corner-shared SiO4 tetrahedra and an approximately equal mixture… 

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