Ukrainian Journal of Physical Optics 

Number  4, Volume 4,  2003

Home page

Other articles 
in this issue

Baric Changes in the Optical Indicatrix of TGS Crystals with L-threonine Admixture  
1Kardash V., 2Romanyuk G., 2Brezvin R., 1Kurlyak V., 1Stadnyk V.

1Lviv Ivan Franko National University, 8 Kyrylo and Mefodiy Str., 79005, Lviv, Ukraine
2Institute of Physical Optics, 23 Dragomanov Str., 79005, Lviv, Ukraine

download full version

The influence of uniaxial mechanical stresses, applied along the principal crystal-physical axes, on the principal values of birefringence ?ni is studied for TGS crystals with 5% L-threonine admixture. It is revealed that ?ni are quite sensitive to the mechanical stresses. The baric coefficients dTc/dsm for the phase transition temperature appear to be less than those for the pure TGS. Temperature dependences and dispersion of the piezooptic coefficients are calculated. The jump-like changes in all of the piezooptic coefficients occurring at the Curie temperature in the doped crystals are explained with the contrib-utions of a secondary electrooptic effect.

Key words: birefringence, uniaxial pressure, phase transitions, piezooptic coefficients
PACS: 77.84.Jd, 42.81.Gs,78.20.Hp

doi 10.3116/16091833/4/4/173/2003

1. Batra AK, Aggarwal MD and Lal RB, 2003. Mat. Lett. 57: 3943.
2. Stankowska J and Peter E, 2002. Ferroelectics. 269: 905.
3. Peter E and Stankowska J, 2000. Ferroelectics. 239: 281.
4. Stankowska J, Peter E and Czarnecka A, 1997. Ferroelectics. 190: 71.
5. Stankowska J and Peter E, 2002. Ferroelectics. 269: 57.
6. Demjanyshyn NM and Mytsyk BG, 2002. Fiz. Tverd. Tela 44: 144.

Home | Instructions to Authors | Editorial Board | Meetings & Exhibitions