초록

A durable, optically isotropic glass composition which contains 50-75 percent of germania, 10-25 percent of alumina and/or gallia, and 10-25 percent of terbium oxide and/or dysprosium oxide and/or gadolinium oxide.

대표청구항 ▼

An isotropic glass composition which comprises from about 50 to about 75 mole percent of germania, from about 10 to about 25 mole percent of an oxide selected from the group consisting of gallia, alumina, and mixtures thereof, and from about 10 to about 25 mole percent of an oxide selected from the

An isotropic glass composition which comprises from about 50 to about 75 mole percent of germania, from about 10 to about 25 mole percent of an oxide selected from the group consisting of gallia, alumina, and mixtures thereof, and from about 10 to about 25 mole percent of an oxide selected from the group consisting of terbium oxide, dysprosium oxide, gadolinium oxide, and mixtures thereof, wherein said glass composition is comprised of at least about 85 mole percent of a mixture of oxides selected from the group consisting of germania, gallia, alumina, terbium oxide, gadolinium oxide, and dysprosium oxide.