Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 189, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2023.107200
Keywords
Heat capacity; Technetium; Calorimetry; Enthalpy; Fission product
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In this study, the heat properties of technetium metal were measured and analyzed using various thermal measurement methods, including its superconductivity, zero-degree Debye temperature, electronic heat capacity coefficient, and the standard entropy of the superconducting state.
The heat capacity of technetium metal has been measured from 2.1 K to 293 K using relaxation calorimetry and the enthalpy increment up to 1700 K using drop calorimetry. The low-temperature calorimetry measurements revealed a superconducting transition temperature of TC = (7.76 +/- 0.08) K. The zero-degree Debye temperature (theta E) and the electronic heat capacity coefficient (gamma e) of the normal state were derived as (307 +/- 5) K and (4.22 +/- 0.20) mJ center dot K-2 center dot mol-1, respectively. The standard entropy of the superconducting standard state was derived as S degrees m (298.15) = (36.8 +/- 1.3) J center dot K-1 center dot mol-1. The fitting of enthalpy-increment data together with high-temperature heat capacity data reported in literature yielded a heat capacity equation up to 1700 K.
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