Accession Number:

AD0737718

Title:

Thermodynamics of Alloys. Solid Electrolyte Studies and Differential Scanning Colorimetry of Palladium-Indium Alloys.

Descriptive Note:

Final technical rept. 1 Jan-31 Dec 71,

Corporate Author:

BIRMINGHAM UNIV (ENGLAND) DEPT OF PHYSICAL METALLURGY AND SCIENCE OF MATERIALS

Personal Author(s):

Report Date:

1972-01-01

Pagination or Media Count:

38.0

Abstract:

Reversible galvanic cells employing zirconia-calcia solid electrolytes have been used to measure thermodynamic activities and free energies of formation of palladium-indium alloys at temperatures between 750K and 1170K. Values obtained have been combined with previous calorimetric data including enthalpy of formation measurements to yield entropies of formation for palladium-rich f.c.c. solid solution and for the intermediate phase Pd3In, Pd2In, Pd5In3, PdIn, Pd2In3, and PdIn3. An analysis of the entropies into configurational, electronic, vibrational and magnetic contributions is suggested. Differential scanning calorimetry has been employed to investigate the existence of order in Pd3In and the effect of plastic deformation on the structure of this phase. A comparison is made of DeBye temperatures of the phases estimated independently from the entropy and the specific heat data. Author

Subject Categories:

  • Physical Chemistry
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE