Birefringence of mechanically
clamped TGS crystals with L‑valine
admixture
Chem.
Met. Alloys 4
(2011) 46-49
https://doi.org/10.30970/cma4.0144
Vasyl STADNYK, Mykola ROMANYUK, Yurij KIRYK, Ruslan BREZVIN
The influence of uniaxial
mechanical stresses applied along the crystal-physical axes on the principal
values of the birefringence, Dni, was studied for TGS crystals with 5% L-valine
admixture. It was found that Dni are quite sensitive to stress and
adopt different values and opposite signs, when compared to pure TGS. The baric coefficients dТc/dσm for the phase transition (PT)
temperature appear to be less than for pure TGS. The temperature dependence of the combined piezooptic constants was
calculated. The values of the jump-like changes occurring for all the piezooptic constants at the PT are notably lower for the
doped crystals than for pure TGS.
Temperature dependence of the piezooptic constants of TGS
crystals doped with 5% L‑valine, measured at λ = 500 nm
Keywords
Birefringence / Uniaxial
pressure / Phase transitions / Piezooptic constants