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The Raman spectra of MgXO 3 -ilmenites (X = Si, Ge, Ti) were recorded up to 773 K at ambient pressure and up to 20-30 GPa at room temperature. Temperature and pressure dependence of the force constant of X-O stretching bands revealed that the expansion and compression behavior of XO 6  octahedra differed in the three ilmenites. For SiO 6  and GeO 6  octahedra, the shorter Si-O or Ge-O bonds became more lengthened with temperature and more shortened with pressure than did the longer Si-O or Ge-O bonds. In contrast, for TiO 6  octahedra, the longer Ti-O bonds became more lengthened with temperature and more shortened with pressure than did the shorter Ti-O bonds. For SiO 6  and GeO 6  at high temperatures and TiO 6  at high pressures, the cation positions moved in the direction of the  c  axis and tended to approach the center of the octahedra, decreasing the distortion of XO 6 . For SiO 6  and GeO 6  at high pressures and TiO 6  at high temperatures, the cations moved away from the center, increasing the distortion of XO 6 . One of the anharmonic correction terms on isochoric specific heat was also elucidated. The anharmonic effects were related to the elastic Debye temperature of the three ilmenites.

american mineralogist

Comparative Raman spectroscopic study on ilmenite-type MgSiO 3  (akimotoite), MgGeO 3 , and MgTiO 3  (geikielite) at high temperatures and high pressures