Fig. 1: Physical chemical properties of the tantalo-gallate glasses.
From: Tantalo-gallate glass as robust nonlinear medium for mid-infrared photonics

Effect of germanium oxide substitution for tantalum oxide on a linear absorption coefficients, b Raman spectra, c) Vickers hardnesses and d corrosion rates of gallate glasses. Weight loss values over time are depicted in d inset. For c and d lines are drawn as a guide to the eye.