Temperature Dependence of Young's Modulus of Vitreous Germania and Silica

Abstract

The temperature dependence of Young's modulus of vitreous GeO2 has been determined by a dynamic resonance method from −195°C to 540°C. The modulus increases with increasing temperature from about −120°C to 400°C. Below and above this range the modulus decreases with increasing temperature. Young's modulus for vitreous SiO2 also increases from about −190°C to 1175°C and decreases with increasing temperature outside this range. In view of the similarity in structures and bond energies of these two materials, the similarity in the elastic modulus‐temperature relations is believed to be significant; especially when contrasted with the lack of agreement in another commonly measured anharmonic property,thermal expansion.