Stress-optical constants (q11 - q12), (q11 - q13) and q44 of mixed alum [(NH4) 1 - xKxAl(SO4)2.12H2O] crystals have been determined employing a modified form of Filon's spectrometer method in the wavelength range 4800-6200 Å. Corresponding strain-optical constants (P11--P12), (P11--P13) and P44 are derived from these using elastic constant data. It is observed that at a given wavelength all the constants vary regularly, though nonlinearly, with the composition of crystals. The deviation from linearity is found to be largest around equimolar concentrations.
No takes yet. Share an insight, caveat, or question.
Sharma et al. (1984) studied this question.