Temperature coefficients of the electroelastic constants of quartz

In the domain between -40 degrees and 60 degrees C the temperature derivatives of the electroelastic constants of alpha-quartz are on the order of 10/sup -3/ to 10/sup -4/ N/(V-m- degrees C). This is about 100 times less than hitherto believed. The temperature coefficients T(e/sub ijk/) given in degrees C/sup -1/ are on the same order of magnitude. Also contrary to earlier beliefs, available data cannot be used to determine all eight fundamental independent temperature coefficients T(e/sub ijk/) existing in the basic reference frame of quartz. Only six relevant quantities can be calculated, five of them as linear combinations of the fundamental T(e/sub ijk/). Their estimates, based on the available data, are given for 25 degrees C.<>