Title :
The investigation of the real structure and mechanical stresses in berlinite and langasite crystals
Author :
Naumov, V.S. ; Kalashnikova, I.I. ; Aleshko-Ozhevskij, O.P.
Author_Institution :
Scientific-Res. Inst., Moscow, Russia
Abstract :
The structural perfection of the berlinite (AlPO4) and the langasite (La3Ga5SiO14) crystals have been investigated with the help of X-ray topography. The inclusions, dislocations and different types of twins have been observed. The influence of the uniaxial stress along the crystallographic X and Y directions on the change of the light polarization plane rotation in these crystals have been studied. The appearance of two types of the circular birefringence: the screw and axial types have been found. The method of the separation of these effects have been developed, that have allowed to increase the sensitivity of the method of control of the internal stresses in crystals
Keywords :
X-ray diffraction; X-ray topography; aluminium compounds; birefringence; dislocations; gallium compounds; inclusions; internal stresses; lanthanum compounds; light polarisation; piezoelectric materials; twin boundaries; AlPO4; La3Ga5SiO14; X-ray topography; axial type; berlinite; circular birefringence; dislocations; inclusions; internal stresses; langasite; light polarization plane rotation; mechanical stresses; piezoelectric crystals; screw type; structural perfection; structure; twins; uniaxial stress; Birefringence; Crystallography; Crystals; Optical detectors; Optical distortion; Optical polarization; Piezoelectric devices; Radio access networks; Stress; Surfaces;
Conference_Titel :
Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-3309-8
DOI :
10.1109/FREQ.1996.559830
