Thermal expansion studies in selenium-phosphorus amorphous system near glass transition temperatures

The thermal expansion coeffs. of $Se_xP_y$ (x = 70-90, y = 10-30) samples near the glass transition points were measured by using a 6-decade ratio transformer bridge assembly. For the $Se_{90}P_{10}$ sample, \alpha was measured during both heating and cooling, and the meaurements were repeated on stabilized samples. Measurements on $Se_{80}P_{20}$ and $Se_{70}P_{30}$ were made on quenched samples only