Bulk A15, high TC Nb3Si synthesized by shock compression

Olinger, Bart; Newkirk, L. R.

doi:10.1016/0038-1098(81)90534-2

Cited by 45 publications

(10 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To further investigate the effects of HEAs on superconducting properties, we focused on A15type Nb3M (M: Al, Sn, Ge, Ga, Si) compounds, which have a relatively high Tc (above 18 K) and upper critical fields (Hc2(0)) of approximately 30 T [23][24][25][26][27][28][29][30][31][32][33]. They are well known as practical materials for superconducting magnets higher than 10 T [33].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

Yamashita

Matsuda

Mizuguchi

2021

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

Yamashita

Matsuda

Mizuguchi

2021

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…In 1981 Olinger and Newkirk 6 succeeded in converting tetragonal Nb3Si into the (3% smaller unit cell) cubic A15 structure via explosive compression using plastic explosive (RDX plus other minor ingredients). Characterization via x-ray diffraction 6 and bulk low temperature specific heat measurements 7 indicated a 50-70% conversion of the tetragonal phase into the superconducting A15 phase, with a Tc onset of 18.0 K. Hydrodynamic calculations 6 indicated that the tetragonal phase sample experienced a pressure ~90-110 GPa, with a peak temperature of ~1000 o C, a residual temperature of ~ 500 o C, and a time 8 at peak pressure of ~1 µsec.…”

Section: Introductionmentioning

confidence: 99%

“…In 1981 Olinger and Newkirk [6] succeeded in converting tetragonal Nb 3 Si into the (3% smaller unit cell) cubic A15 structure via explosive compression using plastic explosive (RDX plus other minor ingredients). See figure 1 for a depiction of both structures and the repositionings necessary to transform the tetragonal to the A15 structure.…”

Section: Introductionmentioning

confidence: 99%

“…Characterization via x-ray diffraction [6] and bulk low temperature specific heat measurements [8] indicated a 50%-70% conversion of the tetragonal phase into the superconducting A15 phase, with a T c onset of 18.0 K. Hydrodynamic calculations [6] indicated that the tetragonal phase sample experienced a pressure ∼90-110 GPa, with a peak temperature of ∼1000 • C, a residual temperature of ∼500 • C, and a time [8] at peak pressure of ∼1 μsec.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The lattice parameter is 5.091 + 0.006/~, the inductive T c is 18.6 K, it displays a large specific heat transition at 18.0 K, and has an upper critical field of 12.5 T (Olinger & Newkirk, 1981;Stewart, Olinger & Newkirk, 198 la,b).…”

Section: Introductionmentioning

confidence: 99%

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

Olinger¹,

Newkirk²,

King³

1982

Acta Cryst Sect A

View full text Add to dashboard Cite

Nb3Si in the Cr3Si (A15) structure has been successfully recovered in bulk amounts after shock compressing Nb3Si in the Ti3P structure. The material was under compression less than 1 ~s. To account for the extreme rapidity of the transformation we find that the essential characteristics of the Cr3Si structure can be achieved by screw rotating one type of column of Nb-atom pairs 45 ° and one quarter cell length in the Ti3P structure. It is further shown that the Fe3P structure cannot be similarly transformed.

show abstract

Bulk A15, high TC Nb3Si synthesized by shock compression

Cited by 45 publications

References 7 publications

Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

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

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

Contact Info

Product

Resources

About

Bulk A15, high TC Nb3Si synthesized by shock compression

Cited by 45 publications

References 7 publications

Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

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

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

Contact Info

Product

Resources

About

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

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