The influence of lattice distortion on the temperature frequency dependency

How the experience shows with a stable production flow and an exact equivalent geometric shape of the blanks, the temperature frequency behaviour of the finished crystals can be different. It is known that the first and the third order coefficient of the temperature frequency curve vary for different manufacturers. This effect looks like a variation of the optimal cut angle for the same specification. The position of the activity dips over temperature changes also. Therefore it is necessary to give the blank quality more attention. The effects of different cut angles are well known and can be controlled by common X-ray measurements. The present work correlates the lattice deformations with the changes in the behaviour of the activity dips. The measurement of the lattice constants and the rocking curves for different blank producers (and raw material producers) corresponds with the temperature frequency behaviour and the theoretical calculations.