Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Chemistry and Pharmacology
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.
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