Pressure and temperature derivatives of the elastic moduli of a machinable glass ceramic

摘要

The elastic moduli and their temperature and pressure derivatives have been determined for a machinable glass ceramic. The behavior of the thermoelastic properties is similar to the case of crystalline solids, i.e., it possesses negative temperature and positive pressure derivatives. The specific heat evaluated from the elastic data is essentially equal to the measured specific heat over the range 2ndash;20 K. The elastic Gruuml;neisen constant is positive and constant over the range 0ndash;400 K. The thermoelastic properties of the material are mainly determined by the included mica crystallites.