Abstract
The superconducting temperature of the near-eutectoid TiD0.74 and ZrD0.48 alloys is measured in dependence on pressure to 30 and 41.5 GPa, respectively. We find that TiD0.74 becomes a superconductor at a pressure corresponding to its transformation to the high-pressure phase. The T c(P) dependence is an increasing function of pressure. The extrapolated to zero pressure value, 7c(0) = 4.0 K, is small compared to the superconducting temperature of the metastable χ-phase earlier obtained after thermobaric treatment, which is indicative of structural inconsistency between the χ- and high-pressure phases. The T c(P) dependence observed on ZrD0.48 is much the same as in pure Zr. The ZrD0.48 superconductivity behavior under pressure is therefore related to the superconducting properties of the high-pressure ω-phase and the ω − ß transition under pressure.
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Abbreviations
- T:
-
temperature
- Tc :
-
the superconducting transition temperature
- P:
-
pressure
- c:
-
concentration (atomic percentage)
- x=H/Me:
-
the atomic hydrogen-to-metal ratio
- χ:
-
magnetic susceptibility
- c/a and b/a:
-
the lattice parameter ratios
- α:
-
the hexagonal close-packed (HCP) phase of Ti and Zr and hydrogen solid solutions in it
- β:
-
the body-centered cubic (BCC) phase of Ti and Zr and hydrogen solid solutions in it,
- ω:
-
the hexagonal high-pressure phase of Ti and Zr and hydrogen solid solution in it
- γ:
-
the ordered face-centered orthorhombic monohydride in the Ti - H and Zr - H systems
- δ:
-
the face-centered cubic (FCC) non-stoichiometric dihydride in both systems
- ε:
-
the face-centered tetragonal (FCT) dihydride in both systems with the H content up to x = 2
- ζ:
-
the FCT high-pressure phase in the Ti - H system around the eutectoid composition
- χ:
-
the metastable FCT phase due to low-temperature quenching of the ζ-phase under pressure
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Bashkin, I.O., Nefedova, M.V., Tissen, V.G., Ponyatovsky, E.G. (2002). Superconductivity of the Ti — D and Zr — D Alloys Under Pressure. In: Hampton, M.D., Schur, D.V., Zaginaichenko, S.Y., Trefilov, V.I. (eds) Hydrogen Materials Science and Chemistry of Metal Hydrides. NATO Science Series, vol 71. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0558-6_1
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DOI: https://doi.org/10.1007/978-94-010-0558-6_1
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