Abstract
The temperature and spectral dependences of the birefringence Δn i of triglycine sulphate (TGS) crystals with L-threonine impurity have been investigated. Doping with L-threonine is found to reduce the temperature dependence of Δn i of TGS crystals. The baric coefficients of shift of the phase-transition (PT) point, ∂T c /∂σm, are found to be somewhat smaller than those for pure TGS crystals, which is confirmed by the increase in the hardness of TGS crystals after doping. The temperature and spectral dependences of the combined piezoelectric constants π im 0 have been calculated. The stepwise changes in all piezoelectric constants at the PT of doped crystals are found to be much smaller than those for pure crystals.
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