Accession Number : AD0677229

Title :   PREPARATION AND PROPERTIES OF TANTALUM DISULFIDE,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Bukhanevich,V. F. ; Radzikovskaya,S. V.

Report Date : 15 DEC 1967

Pagination or Media Count : 7

Abstract : Preparation and properties of tantalum disulfide were studied to supplement literature data on sulfides of refractory transition metals. Direct reaction of the powdered metal with hydrogen sulfide was selected as the method of preparation most adaptable to industrial processes and susceptible to yield single-phase tantalum sulfides. Stoichiometric tantalum disulfide in powdered form was obtained by reacting at 1400C, 99.0% tantalum metal with hydrogen sulfide which was prepared in situ from hydrogen and sulfur vapors. The lattice parameters and picnometric density of the product were found to be in agreement with literature data and with the calculated value, respectively. The TaS2 product was found to be stable in boiling water and HCl but decomposed completely by heating in oxidizing reagents, e.g., concentrated H2SO4, HNO3, H2O2. TaS2 was resistant to oxidation in an oxygen stream up to 300C. In oxygen at 500C, TaS2 was completely oxidized to tantalum pentoxide and sulfur dioxide. (Author)

Descriptors :   (*REFRACTORY MATERIALS, PREPARATION), (*TANTALUM COMPOUNDS, SYNTHESIS(CHEMISTRY)), SULFIDES, HYDROGEN COMPOUNDS, POWDER METALS, OXIDATION, STABILITY, USSR, PHYSICAL PROPERTIES

Subject Categories : Inorganic Chemistry
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE