Accession Number : AD0860241

Title :   Mass Spectrometric Study of Rare Earth-Carbon Systems. IV. The Erbium-Carbon System.

Descriptive Note : Technical rept. 1 May-31 Dec 68,

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

Personal Author(s) : Balducci, G. ; DeMaria, G. ; Guido, M.

Report Date : JUL 1969

Pagination or Media Count : 21

Abstract : A sample of erbium dicarbide has been prepared by direct reaction of the elements in a graphite lined molybdenum crucible. The vaporization of the dicarbide has been studied by means of the Knudsen effusion-mass spectrometric technique over the temperature range 1750-2500K. The vapor species above EdC2(s) were found to be Er(g) and, as a minor constituent, ErC2(g). From the vapor pressure equation the enthalpy of vaporization of ErC2(s) to Er(g) was found. From this value the standard heat of formation of C-rich ErC2(s) was calculated. The stability of ErC2(g) molecule has also been determined. (Author)

Descriptors :   (*RARE EARTH COMPOUNDS, VAPORIZATION), (*CARBIDES, VAPORIZATION), (*ERBIUM COMPOUNDS, VAPORIZATION), MASS SPECTROSCOPY, HEAT OF FORMATION, VAPOR PRESSURE, THERMOCHEMISTRY.

Subject Categories : Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE