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. J.M. Konings (European Commission - Joint Research Centre, TU Delft - EMSD AS-south Project technicians)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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.