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A low-temperature technique for measuring enthalpies of formation

Published online by Cambridge University Press:  31 January 2011

T. P. Weihs ,
T. W. Barbee Jr.  and
M. A. Wall
T. P. Weihs
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550
T. W. Barbee Jr.
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550
M. A. Wall
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550
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Abstract

A technique to accurately measure the formation enthalpies of transition metal compounds at relatively low temperatures using thick multilayer foils and differential scanning calorimetry is demonstrated. The enthalpy of formation of Cu51Zr14 was measured using 25 μm thick, free-standing Cu–Zr multilayer foils. The multilayers were deposited onto Si substrates using a planetary, magnetron source sputtering system. They were removed from their substrates, cut into 6 mm diameter specimens, and scanned in temperature from 50 °C to 725 °C in a differential scanning calorimeter. Three distinct exothermic reactions were systematically observed. The heats from the first two reactions were summed and then analyzed using a simple model that accounts for interfacial reactions and heat losses during deposition. The enthalpy of formation for Cu51Zr14 was measured to be 14.3 ± 0.3 kJ/mol. This quantity agrees with the single value of ΔHf = 14.07 ± 1.07 kJ/mol reported in the literature for this Cu–Zr compound. The advantages of measuring formation enthalpies using thick multilayer foils and low temperature calorimetry are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1403 - 1409
Copyright
Copyright © Materials Research Society 1996

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