The density, glass transformation temperature and hardness of these glasses increase with increasing atomic number and concentration of the rare earth ion present in the glass, while the thermal expansion coefficient is independent of rare earth identity. Glasses containing alumina are less dense and have lower refractive indices and thermal expansion coefficients than those containing gallia, but they are also more refractory and harder.
Origin
Alfred University, Usa
Journal Title
Phys And Chem Of Glasses 35 1 1994 1-5
Sector
Special Glass
Class
S 783