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Thermodynamic properties and superconductivity of natural carrollite (CuCo2S4)

Journal Article · · Journal of Chemical Thermodynamics
 [1];  [2];  [2];  [3];  [4];  [2];  [1]
  1. Brigham Young University, Provo, UT (United States)
  2. Arizona State University, Tempe, AZ (United States)
  3. Stellenbosch University, Matieland (South Africa)
  4. University of Tennessee, Knoxville, TN (United States)
The thermodynamic properties of natural carrollite with a formula Cu0.92Co2.07S4 are studied using low temperature heat capacity and high temperature oxidative solution calorimetry. The standard thermodynamic functions at 298.15 K are: Cp,m°, Sm°, Hm°, and Φm° are 158.48 J∙K−1∙mol−1, 176.33 J∙K−1∙mol−1, 28.40 kJ∙mol−1, and 81.07 kJ∙mol−1 with an estimated error of 1%. The enthalpies (ΔfH), entropies (ΔfS), and Gibbs energies of formation (ΔfG) from elements at 298.15 K are: −344.46 ± 12.87 kJ∙mol−1, −45.22 ± 1.81 J∙K−1∙mol−1, and −331.14 ± 1.89 J∙K−1∙mol−1. The stability of carrollite relative to the elements is demonstrated with a negative Gibbs energy (ΔGr°) of formation for several temperatures between 0 and 300 K. Furthermore, a superconductivity transition, which has been observed previously for synthetic carrollite, is confirmed by both the low temperature heat capacity and magnetization measurements.
Research Organization:
Univ. of California, Davis, CA (United States); Univ. of Tennessee, Knoxville, TN (United States); University of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-97ER14749; SC0021344
OSTI ID:
3013120
Alternate ID(s):
OSTI ID: 2576771
Journal Information:
Journal of Chemical Thermodynamics, Journal Name: Journal of Chemical Thermodynamics Vol. 185; ISSN 0021-9614
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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