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Review of Thermodynamic Properties of the Cr‐N System
Author(s) -
LUCA J. P.,
LEITNAKER J. M.
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.tb15426.x
Subject(s) - standard enthalpy of formation , thermodynamics , phase diagram , heat capacity , chemistry , nitride , diagram , atom (system on chip) , partial pressure , materials science , phase (matter) , physics , mathematics , nanotechnology , organic chemistry , statistics , layer (electronics) , oxygen , computer science , embedded system
Existing thermodynamic data for the Cr‐N system were analyzed. High‐temperature heat contents measured by Sato were reevaluated, and the heat capacity of Cr 2 N was determined to be 15.05+6.58×10 −3 T (°K) and that of CrN 11.10+ 1.58×10 3 T . Using these heat capacities and an estimated ΔS° 298, f of 20×1 cal/°K‐g atom N for the formation of the nitrides, second‐ and third‐law calculations for all available vapor‐pressure data were made. The two calculations agreed very well for the data of Mills. The heats of formation of Cr 2 N and CrN are ‐31.8×1.0 and ‐28.4×1.5 kcal/mol, respectively. A partial phase diagram of the Cr‐N system is presented.