Accession Number : ADP004370

Title :   Progress on Transparent Yttria,

Corporate Author : GTE LABS INC WALTHAM MA

Personal Author(s) : Rhodes,W. H. ; Trickett,E. A.

Report Date : 1984

Pagination or Media Count : 8

Abstract : La203 - doped Y203 is of interest for infrared applications because it is one of the longest wavelength transmitting oxides. It is refractory with a melting point of 2430 deg c and has a moderate expansion coefficient. The thermal shock and erosion resistance is considered to be intermediate among the oxides, but outstanding compared to non-oxide infrared materials. A major consideration is the low emissivity of Y203 which limits background radiation upon heating. It is also known that the phonon edge gradually moves to shorter wavelengths as a material is heated.

Descriptors :   *Yttrium oxides, Background radiation, Coefficients, Expansion, Melting point, Thermal shock, Frequency, Oxides, Transmitting, Erosion resistance, Infrared radiation, Infrared optical materials, Edges, Phonons, Transparence

Distribution Statement : APPROVED FOR PUBLIC RELEASE