Partial atomic volume and partial molar enthalpy of formation of the 3d metals in the palladium-based solid solutions

The composition dependence of the average atomic volume, as well as of the enthalpy of formation, was investigated for the palladium-containing binary systems with the 3d metals. The partial atomic volume and the partial molar enthalpy of formation of the 3d metals were determined for the palladium-...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2004, Vol.35 (1), p.63-70
Main Author: ELLNER, M
Format: Article
Language:English
Subjects:
Alloys
Chemical elements
Condensed matter: structure, mechanical and thermal properties
Entropy and other thermodynamical quantities
Exact sciences and technology
Metals
Physics
Thermal properties of condensed matter
Thermal properties of crystalline solids
Thermodynamic properties
Thermodynamics
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Summary:The composition dependence of the average atomic volume, as well as of the enthalpy of formation, was investigated for the palladium-containing binary systems with the 3d metals. The partial atomic volume and the partial molar enthalpy of formation of the 3d metals were determined for the palladium-based solid solutions (Pearson symbol cF4, space group Fm3m, Cu type). The 3d early transition metals (scandium, titanium, and vanadium) as well as the 3d^sup 10^4s^sup 2^ . . . 3d^sup 10^4s^sup 2^4p metals (zinc and gallium) show (1) the partial atomic volume for the palladium-based solid solutions smaller than is their atomic volume in the nonbonded state and (2) significantly large (negative) values of the partial molar enthalpy of formation indicating a strong bond energy between atoms of palladium and those of the 3d early transition metals (as well as a strong bond energy between atoms of palladium and zinc or gallium atoms). The 3d late transition metals (and chromium) show (1) the partial atomic volume for the palladium-based solid solutions larger than is their atomic volume in the nonbonded state and (2) low (negative) values of the partial molar enthalpy of formation indicating weak bond energy between atoms of palladium and those of the 3d late transition metals. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-004-0109-5