Accession Number : AD0673044

Title :   ON THE TEMPERATURE DEPENDENCE OF THE HEAT OF FORMATION OF THE COMPOUND AGMG.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Jena,A. K. ; Bever,M. B.

Report Date : 22 JUL 1968

Pagination or Media Count : 10

Abstract : Heats of formation at 78K, 195K and 273K of the compound AgMg containing 50.1 at. pct Mg were measured by metal solution calorimetry. The relative partial gram-atomic enthalpy of silver in liquid tin-rich solutions at infinite dilution was also measured. The temperature coefficient of the heat of formation is negative and appreciable near 78K, but with increasing temperature it decreases gradually to a small value near room temperature. This is consistent with the reported high-temperature heat contents of AgMg, Ag and Mg. It is suggested that such behavior of the temperature dependence of the heat of formation can be explained on the basis of the contributions from lattice heat capacities. (Author)

Descriptors :   (*SILVER COMPOUNDS, HEAT OF FORMATION), (*MAGNESIUM COMPOUNDS, HEAT OF FORMATION), (*INTERMETALLIC COMPOUNDS, CALORIMETRY), SILVER ALLOYS, MAGNESIUM ALLOYS, TIN ALLOYS, HEAT OF SOLUTION, ENTHALPY

Subject Categories : Physical Chemistry
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE