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Superconductivity of the Ti — D and Zr — D Alloys Under Pressure

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Hydrogen Materials Science and Chemistry of Metal Hydrides

Part of the book series: NATO Science Series ((NAII,volume 71))

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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

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-4020-0731-6

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