In-situ Raman and Brillouin light scattering study of the international simple glass in response to temperature and pressure

International simple glass (ISG) is a six-component boroaluminosilicate glass recently developed as a reference benchmark glass for international collaborative studies on high level nuclear waste encapsulation. In this work, structure and elastic properties of the ISG in response to temperatures up to 700 °C and pressure up to 5.5 GPa were studied by in-situ Raman and Brillouin light scattering. Structural integrity of the ISG was evidenced from room temperature to 550 °C by negligible changes in its Raman spectra and elastic moduli. Raman and Brillouin light scattering measurements showed that the ISG was only elastically deformed throughout the tested pressure range.