Light-transmitting, polycrystalline alumina body and method for producing the same

Abstract

A light-transmitting crystalline alumina body which consists of .alpha.-Al.sub.2 O.sub.3 containing 0.1 to 1.0 weight percent of strontium oxide. A method for producing an alumina body comprises preparing a mixture of finely divided alumina powder with 0.1 to 1.0 weight percent of finely divided powder of strontium oxide, pressing the mixture to form a compact, prefiring the compact at a temperature at about 1100.degree. C. in an oxygen containing atmosphere, and firing the prefired compact at a temperature of about 1650.degree. C. in an environment selected from the group consisting of vacuum and hydrogen.

Dependencies are inferred from the claim text.