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Heat of Vaporization of EuN and Its Standard Heat of Formation
Author(s) -
KORDIS J.,
GINGERICH K. A.,
KALDIS E.
Publication year - 1973
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1973.tb12420.x
Subject(s) - vaporization , europium , knudsen number , standard enthalpy of formation , chemistry , enthalpy , atmospheric temperature range , enthalpy of vaporization , dissociation (chemistry) , mass spectrometry , analytical chemistry (journal) , body orifice , vapor pressure , thermodynamics , ion , organic chemistry , chromatography , ecology , physics , biology
The vaporization of EuN was studied by Knudsen effusion mass spectrometry with Mo Knudsen cells of 0.010 and 0.020 in. orifice diameter. Europium nitride has a narrow N‐deficient homogeneity range and vaporizes congruently by dissociation into Eu vapor and N 2 . No gaseous EuN was observed. The second‐law enthalpy change for the reaction EuN 1‐ x ( s ) = Eu(g) + [(1‐ x )/2]N 2 (g), where x is very small, was Δ H 0 298 = 94±6 kcal (393.3±25.1 kJ). In conjunction with the heat of vaporization of Eu, the standard heat of formation of EuN, Δ H 0 f.298 =–52±6 kcal mol −1 (217.6±25.1 kJ mol −1 ), was obtained.