Abstract
The thermal expansion coefficients of a number of phenacites [Be2SiO4, β-Si3N4, β-Sialon, α-LiAlSiO4, Zn2SiO4, CdAl2O4, and Zn2GeO4] at temperatures at and above the Debye temperature are analyzed in terms of the thermal Grüneisen parameter γ. The phenacites have γ values intermediate between adamantine crystals and quartz. Values of γ between 0.3 and 0.7 are found. A useful correlation exists between γ and the average volume per anion bond W. Values of γ approaching zero occur for sufficiently large values of W.

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