Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication

Mitchell, Jonathan E; Hillesheim, D A; Bridges, Craig A; Paranthaman, Mariappan Parans; Gofryk, Krzysztof; Rindfleisch, M; Tomsic, M; Safa-Sefat, Athena

doi:10.1088/0953-2048/28/4/045018

Title: Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication

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Abstract

Here we report on the optimization of synthesis of iron selenide-based superconducting powders and the fabrication of selenide-based wire. The powders were synthesized by an ammonothermal method, whereby Ba is intercalated between FeSe layers to produce Ba_x(NH₃)_yFe₂Se₂, with tetragonal structure similar to AFe₂X₂ (X: As, Se), '122', superconductors. The optimal T_c (up to 38 K) and Meissner and shielding superconducting fractions are obtained from the shortest reaction time (t) of reactants in liquid ammonia (30 min). With the increase of t, a second crystalline 122 phase, with a smaller unit cell, emerges. A small amount of NH₃ is released from the structure above ~200 °C, which results in loss of superconductivity. However, in the confined space of niobium/Monel tubing, results indicate there is enough pressure for some of NH₃ to remain in the crystal lattice, and thermal annealing can be performed at temperatures of up to 780 °C, increasing wire density and yielded a reasonable T_c ≈ 16 K. Here, we report of the first successful wire fabrication of non-arsenic high-T_c iron-based superconductor. We find that although bulk materials are estimated to carry critical current densities >100 kA cm^₋2 (4 K, self-field), the current transport within wires need to bemore » optimized (J_c ~ 1 kA cm^₋2).« less

Authors:

Mitchell, Jonathan E ^[1]; Hillesheim, D A ^[2]; Bridges, Craig A ^[2]; Paranthaman, Mariappan Parans ^[2]; Gofryk, Krzysztof ^[3]; Rindfleisch, M ^[4]; Tomsic, M ^[4]; Safa-Sefat, Athena ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Idaho National Lab. (INL), Idaho Falls, ID (United States)
Hyper Tech Research, Inc., Columbus, OH (United States)

Publication Date:: Fri Mar 13 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1185826

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Superconductor Science and Technology

Additional Journal Information:: Journal Volume: 28; Journal Issue: 4; Journal ID: ISSN 0953-2048

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; iron based superconductor; selenide wire; non arsenic

Citation Formats


                    Mitchell, Jonathan E, Hillesheim, D A, Bridges, Craig A, Paranthaman, Mariappan Parans, Gofryk, Krzysztof, Rindfleisch, M, Tomsic, M, and Safa-Sefat, Athena. Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication.  United States: N. p., 2015. 
Web.  doi:10.1088/0953-2048/28/4/045018.

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                    Mitchell, Jonathan E, Hillesheim, D A, Bridges, Craig A, Paranthaman, Mariappan Parans, Gofryk, Krzysztof, Rindfleisch, M, Tomsic, M, & Safa-Sefat, Athena. Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication.  United States.  https://doi.org/10.1088/0953-2048/28/4/045018

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                    Mitchell, Jonathan E, Hillesheim, D A, Bridges, Craig A, Paranthaman, Mariappan Parans, Gofryk, Krzysztof, Rindfleisch, M, Tomsic, M, and Safa-Sefat, Athena. Fri .  
"Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication".  United States.  https://doi.org/10.1088/0953-2048/28/4/045018.  https://www.osti.gov/servlets/purl/1185826.

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@article{osti_1185826,

  title        = {Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication},

  author       = {Mitchell, Jonathan E and Hillesheim, D A and Bridges, Craig A and Paranthaman, Mariappan Parans and Gofryk, Krzysztof and Rindfleisch, M and Tomsic, M and Safa-Sefat, Athena},

  abstractNote = {Here we report on the optimization of synthesis of iron selenide-based superconducting powders and the fabrication of selenide-based wire. The powders were synthesized by an ammonothermal method, whereby Ba is intercalated between FeSe layers to produce Bax(NH3)yFe2Se2, with tetragonal structure similar to AFe2X2 (X: As, Se), '122', superconductors. The optimal Tc (up to 38 K) and Meissner and shielding superconducting fractions are obtained from the shortest reaction time (t) of reactants in liquid ammonia (30 min). With the increase of t, a second crystalline 122 phase, with a smaller unit cell, emerges. A small amount of NH3 is released from the structure above ~200 °C, which results in loss of superconductivity. However, in the confined space of niobium/Monel tubing, results indicate there is enough pressure for some of NH3 to remain in the crystal lattice, and thermal annealing can be performed at temperatures of up to 780 °C, increasing wire density and yielded a reasonable Tc ≈ 16 K. Here, we report of the first successful wire fabrication of non-arsenic high-Tc iron-based superconductor. We find that although bulk materials are estimated to carry critical current densities >100 kA cm₋2 (4 K, self-field), the current transport within wires need to be optimized (Jc ~ 1 kA cm₋2).},

  doi          = {10.1088/0953-2048/28/4/045018},

  journal      = {Superconductor Science and Technology},

  number       = 4,

  volume       = 28,

  place        = {United States},

  year         = {Fri Mar 13 00:00:00 EDT 2015},

  month        = {Fri Mar 13 00:00:00 EDT 2015}

}

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