Low- and high-temperature heat capacity of metallic technetium
[3];
- European Commission, Karlsruhe (Germany). Joint Research Centre (JRC); Delft Univ. of Technology (Netherlands)
- European Commission, Karlsruhe (Germany). Joint Research Centre (JRC); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- European Commission, Karlsruhe (Germany). Joint Research Centre (JRC)
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 ($$γ_{e}$$) 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 $$S^{°}_{m}$$ (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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 2280888
- Report Number(s):
- LLNL--JRNL-839659; 1060378
- Journal Information:
- Journal of Chemical Thermodynamics, Journal Name: Journal of Chemical Thermodynamics Vol. 189; ISSN 0021-9614
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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