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Mixing enthalpy and heat content measurements of liquid binary iron‐niobium alloys
Author(s) -
Schaefers Klaus,
RösnerKuhn Michael,
Qin Jianping,
Frohberg Martin G.
Publication year - 1995
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199501109
Subject(s) - enthalpy , enthalpy of atomization , eutectic system , chemistry , standard enthalpy of formation , thermodynamics , calorimetry , enthalpy of mixing , standard enthalpy change of formation , niobium , calorimeter (particle physics) , enthalpy of fusion , melting point , analytical chemistry (journal) , alloy , physics , chromatography , organic chemistry , detector , optics
The mixing enthalpy of the system iron‐niobium has been determined at 1935 and 2035 K for alloys having Nb mass contents of up to 51.5 % by the levitation alloying calorimetry (LAC). Moreover, by means of the combination of an electromagnetic levitation unit with a drop calorimeter the temperature functions of the enthalpies of the eutectic alloys Fe 89.4 Nb 10.6 and Fe 41 Nb 59 and the congruent melting compound Fe 2 Nb have been measured in the liquid state and below their melting points. From these values the melting enthalpies and entropies are calculated. The experimental results are compared with literature data. In consideration of the standard formation enthalpy of the alloys their enthalpy values could be connected with the mixing enthalpy.