Optical activity and birefringence of (NH4)2S04 were measured by using HAUP method, in the temperature range between 50 C and -200 C. Gyration tensor component gi2 appeared suddenly at Tc, and increased gradually with decrease of temperature. No other phase transition was found in this temperature range.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics