Mechanisms for a rapid phase transformation of Nb3Si from the Ti3P structure to the Cr3Si (A15) structure

Olinger, Bart; Newkirk, L. R.; King, James C.

doi:10.1107/s0567739482000278

Cited by 11 publications

(1 citation statement)

References 2 publications

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“…One possible approach would be the creation of new metastable superconducting structures at high pressures which 1 in reference [7].…”

Section: Introductionmentioning

confidence: 99%

A15 Nb₃Si: a ‘high’ T _c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions

Lim¹,

Kim²,

Hire³

et al. 2021

J. Phys.: Condens. Matter

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A15 Nb3Si is, until now, the only ‘high’ temperature superconductor produced at high pressure (∼110 GPa) that has been successfully brought back to room pressure conditions in a metastable condition. Based on the current great interest in trying to create metastable-at-room-pressure high temperature superconductors produced at high pressure, we have restudied explosively compressed A15 Nb3Si and its production from tetragonal Nb3Si. First, diamond anvil cell pressure measurements up to 88 GPa were performed on explosively compressed A15 Nb3Si material to trace T c as a function of pressure. T c is suppressed to ∼5.2 K at 88 GPa. Then, using these T c (P) data for A15 Nb3Si, pressures up to 92 GPa were applied at room temperature (which increased to 120 GPa at 5 K) on tetragonal Nb3Si. Measurements of the resistivity gave no indication of any A15 structure production, i.e. no indications of the superconductivity characteristic of A15 Nb3Si. This is in contrast to the explosive compression (up to P ∼ 110 GPa) of tetragonal Nb3Si, which produced 50%–70% A15 material, T c = 18 K at ambient pressure, in a 1981 Los Alamos National Laboratory experiment. This implies that the accompanying high temperature (1000 °C) caused by explosive compression is necessary to successfully drive the reaction kinetics of the tetragonal → A15 Nb3Si structural transformation. Our theoretical calculations show that A15 Nb3Si has an enthalpy vs the tetragonal structure that is 70 meV atom−1 smaller at 100 GPa, while at ambient pressure the tetragonal phase enthalpy is lower than that of the A15 phase by 90 meV atom−1. The fact that ‘annealing’ the A15 explosively compressed material at room temperature for 39 years has no effect shows that slow kinetics can stabilize high pressure metastable phases at ambient conditions over long times even for large driving forces of 90 meV atom−1.

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“…One possible approach would be the creation of new metastable superconducting structures at high pressures which 1 in reference [7].…”

Section: Introductionmentioning

confidence: 99%

A15 Nb₃Si: a ‘high’ T _c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions

Lim¹,

Kim²,

Hire³

et al. 2021

J. Phys.: Condens. Matter

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The Nb-Si (Niobium-Silicon) system

Schlesinger

Okamoto

Gokhale

et al. 1993

JPE

216

147

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Is Nb3Si a 25 K superconductor?

Dew‐Hughes

1986

Cryogenics

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Mechanisms for a rapid phase transformation of Nb₃Si from the Ti₃P structure to the Cr₃Si (A15) structure

Cited by 11 publications

References 2 publications

A15 Nb₃Si: a ‘high’ T _c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions

A15 Nb₃Si: a ‘high’ T _c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions

The Nb-Si (Niobium-Silicon) system

Is Nb3Si a 25 K superconductor?

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Mechanisms for a rapid phase transformation of Nb3Si from the Ti3P structure to the Cr3Si (A15) structure

Cited by 11 publications

References 2 publications

A15 Nb3Si: a ‘high’ T c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions

A15 Nb3Si: a ‘high’ T c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions

The Nb-Si (Niobium-Silicon) system

Is Nb3Si a 25 K superconductor?

Contact Info

Product

Resources

About

Mechanisms for a rapid phase transformation of Nb₃Si from the Ti₃P structure to the Cr₃Si (A15) structure

A15 Nb₃Si: a ‘high’ T _c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions

A15 Nb₃Si: a ‘high’ T _c superconductor synthesized at a pressure of one megabar and metastable at ambient conditions