Low- and high-temperature heat capacity of metallic technetium
J.N. Zappey (European Commission Joint Research Centre, TU Delft - RST/Reactor Physics and Nuclear Materials)
E. E. Moore (European Commission Joint Research Centre, Lawrence Livermore National Laboratory)
O. Beneš (European Commission Joint Research Centre)
J. C. Griveau (European Commission Joint Research Centre)
R. Konings (European Commission Joint Research Centre, TU Delft - EMSD AS-south Project technicians)
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Abstract
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(θE) and the electronic heat capacity coefficient (γe) of the normal state were derived as (307 ± 5) K and (4.22 ± 0.20) mJ·K−2·mol−1, respectively. The standard entropy of the superconducting standard state was derived as Sm° (298.15) = (36.8 ± 1.3) J·K−1·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.