Accession Number : ADA120153
Title : Ternary Sulfide Infrared Window Materials.
Descriptive Note : Annual rept. no. 1, 1 May 80-31 Oct 81,
Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
Personal Author(s) : White,William B
Report Date : 10 Oct 1981
Pagination or Media Count : 86
Abstract : Ternary sulfides, in the most general sense, are all compounds which contain two cations and in which the sulfide ion, S(-2), is the anion. Taking all of the cations on the periodic table pair-wise leads to an immense number of possible compounds. It is useful for an initial screening to categorize the cations by their electronic structure. The greatest and most interesting structural diversity was found in the families of ternary sulfide structures with the stoichiometric formula AB2S4. A very large number of compounds have been identified and there are x-ray diffraction data, but little else, available for many of them. Most of these compounds are yellow or red implying optical band gaps in the 2.0 to 2.5 eV range and thus are candidate window materials, at least from the viewpoint of electronic absorption. Most of the work has been concentrated on compounds belonging to the two cubic structural families, Th3P4 and spinel. Of these only one compound, CaLa2S4 has really been carried the entire way from powder preparation to a massive slab suitable for optical measurements.
Descriptors : *OPTICS , *FRACTURE(MECHANICS) , *CERAMIC MATERIALS , *TERNARY COMPOUNDS , *SULFIDES , *INFRARED WINDOWS , CATIONS , MECHANICAL PROPERTIES , STABILITY , PHYSICAL PROPERTIES , STRUCTURAL ANALYSIS , SYNTHESIS(CHEMISTRY) , X RAY DIFFRACTION , HOT PRESSING , HEAT TREATMENT , ABSORPTION , EQUATIONS , STOICHIOMETRY , INFRARED SPECTRA , SINTERING , POLYCRYSTALLINE , MICROHARDNESS , VIBRATIONAL SPECTRA
Subject Categories : Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE