Glasses and glass-ceramics and methods of making them

A glass includes from 42 mol % to 47 mol % P 2 O 5 , from 42 mol % to 48 mol % CuO, and from greater than 0 mol % to 15 mol % Fe 2 O 3 . The glass is an amorphous, single-phase glass. Methods of making a glass article include heating batch materials to a melting temperature from 900 C. to 1350 C. In aspects, methods include pouring the molten glass in an inert gaseous environment, and cooling the molten glass in the inter gaseous environment. In aspects, methods include cooling the molten glass to form the glass article and annealing the glass article without growing crystals in or on the glass article during the cooling or the annealing.