Accession Number : AD0476742


Title :   MASS SPECTROMETRIC STUDY OF THE YTTRIUM-CARBON SYSTEM.


Descriptive Note : Summary technical rept. 1 Apr 64-15 Jul 65,


Corporate Author : ROME UNIV (ITALY) ISTITUTO DI CHIMICA FISICA ED ELETTROCHIMICA


Personal Author(s) : De Maria, Giovonni ; Guido, M ; Malaspina, L ; Pesce, B


Report Date : Nov 1965


Pagination or Media Count : 17


Abstract : A high temperature investigation of the vapor in thermodynamic equilibrium with the Y-C condensed system was carried out in the temperature range 2075-2340 K. Y and YC2 are shown to be important species in the vapor phase. Utilizing the pressure independent reaction Y(g) + 2C(s) yields Yc2(g), second and third law methods yielded D = 155 + or -6 kcal/mol and D = 156 + or -5 kcal/mol respectively for the Y-C2 bond energy. An estimated heat of formation, delta H = -27 + or -6 kcal/mol, for solid dicarbide is also obtained. Comparison between Me-C2 and Me-O bond strengths is made for Group III A elements and for the first two elements of the lanthanide series. (Author)


Descriptors :   *MASS SPECTROSCOPY , *THERMODYNAMICS , CARBIDES , YTTRIUM COMPOUNDS , IONIZATION , MOLECULAR BEAMS , DETECTION , SIGNALS , IMPURITIES , GASES , IONS , VAPOR PRESSURE , YTTRIUM , VAPORS , ENTHALPY , VAPORIZATION , HIGH TEMPERATURE , THERMOCHEMISTRY


Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE