Accession Number : ADD014194

Title :   Metal Ternary Sulfides.

Descriptive Note : Patent, Filed 30 Sep 85, patented 1 Mar 88,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Covino, Josephine ; Hills, Marian E

Report Date : 01 Mar 1988

Pagination or Media Count : 3

Abstract : This invention is related to transmitting ceramic materials and, more particularly, to ternary sulfides useful as infrared materials such as in windows and missile domes. This invention also relates to a new synthesis of metal sulfides. Infrared transmitting materials are necessary for sensor windows and domes on taellites, missiles and other similar devices. These materials must be chemically stable, abrasion resistant, have low coefficients of thermal expansion, high melting temperatures and good optical transmission characteristics in the desired region of the infrared. This patent relates to metal ternary sulfides of the general formula MM2S4 are synthesized by introducing stoichiometric amounts of nitrate precursors in concentrated nitric acid and heating to approximate dryness to yield a homogeneous powder mixture. The mixture is then exposed to a gaseous H2S atmosphere under controlled conditions to produce the desired sulfide. Keywords: Ceramics; Infrared materials. (kt)

Descriptors :   *CERAMIC MATERIALS, *OPTICAL MATERIALS, *OPTICAL PROPERTIES, *INFRARED OPTICAL MATERIALS, *LIGHT TRANSMISSION, *METALS, *SULFIDES, *TERNARY COMPOUNDS, ABRASION, COEFFICIENTS, CONTROL, DETECTORS, GUIDED MISSILE DOMES, HIGH TEMPERATURE, HOMOGENEITY, INFRARED RADIATION, INFRARED TRANSMITTERS, MIXTURES, MOISTURE CONTENT, NITRATES, NITRIC ACID, PATENTS, POWDERS, PRECURSORS, REGIONS, SYNTHESIS, THERMAL EXPANSION, TRANSMITTING, WINDOWS

Subject Categories : Ceramics, Refractories and Glass
      Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE