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The temperature dependence of Raman shifts and line widths (full-width at half maxima or FWHM) for the A 1  symmetric stretch of TO 4  (T = Si, P, S) have been analyzed for nine alkali and alkaline earth silicates, phosphates, and sulfates. In crystalline silicates, the Q 0  and Q 2  species Raman shifts decrease with temperature, whereas FWHM increase. The strikingly similar behavior of Q 0  and Q 2  in silicates and Q 0  in phosphates makes it possible to estimate to within ±4 cm −1  Raman shifts up to ~1000 K. Similarly systematic increases in FWHM with temperature can be estimated to within ±5 cm −1  up to ~1400 K. The type of element centering TO 4  (i.e., Si, P, or S) has no appreciable effect on the temperature dependence of Raman shifts or line widths; the local environment of the Q 0  and Q 2  tetrahedra is the primary determinant of the temperature dependence. The type of cation in the first coordination sphere of the tetrahedron may have a secondary effect by affecting Heisenberg lifetimes of Raman virtual states.

Temperature dependence of Raman shifts and line widths for Q 0 and Q 2 crystals of silicates, phosphates, and sulfates