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Title: Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon

Abstract

Here, we describe the fabrication and characterization of 25–800 nm thick MgB2 films on glassy carbon substrates by Mg vapor annealing of sputter-deposited amorphous B films. Results demonstrate a critical role of both the initial B film thickness and the temperature–time profile on the microstructure, elemental composition, and superconducting properties of the resultant MgB2 films. Films with thicknesses of 55 nm and below exhibit a smooth surface, with a roughness of 1.1 nm, while thicker films have surface morphology consisting of elongated nano-crystallites. The suppression of the superconducting transition temperature for thin films scales linearly with the oxygen impurity concentration and also correlates with the amount of lattice disorder probed by Raman scattering. The best results are obtained by a rapid (12 min) anneal at 850°C with large temperature ramp and cooling rates of ~540°C min-1. Such fast processing suppresses the deleterious oxygen uptake.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1458621
Report Number(s):
LLNL-JRNL-743108
Journal ID: ISSN 0953-2048; 898052
Grant/Contract Number:  
AC52-07NA27344; 17-ERD-040
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 31; Journal Issue: 5; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Superconductivity; MgB2; Thin Films; Levitation

Citation Formats

Baker, A. A., Aji, L. B. Bayu, Bae, J. H., Stavrou, E., Steich, D. J., McCall, S. K., and Kucheyev, S. O. Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon. United States: N. p., 2018. Web. doi:10.1088/1361-6668/aab4eb.
Baker, A. A., Aji, L. B. Bayu, Bae, J. H., Stavrou, E., Steich, D. J., McCall, S. K., & Kucheyev, S. O. Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon. United States. https://doi.org/10.1088/1361-6668/aab4eb
Baker, A. A., Aji, L. B. Bayu, Bae, J. H., Stavrou, E., Steich, D. J., McCall, S. K., and Kucheyev, S. O. 2018. "Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon". United States. https://doi.org/10.1088/1361-6668/aab4eb. https://www.osti.gov/servlets/purl/1458621.
@article{osti_1458621,
title = {Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon},
author = {Baker, A. A. and Aji, L. B. Bayu and Bae, J. H. and Stavrou, E. and Steich, D. J. and McCall, S. K. and Kucheyev, S. O.},
abstractNote = {Here, we describe the fabrication and characterization of 25–800 nm thick MgB2 films on glassy carbon substrates by Mg vapor annealing of sputter-deposited amorphous B films. Results demonstrate a critical role of both the initial B film thickness and the temperature–time profile on the microstructure, elemental composition, and superconducting properties of the resultant MgB2 films. Films with thicknesses of 55 nm and below exhibit a smooth surface, with a roughness of 1.1 nm, while thicker films have surface morphology consisting of elongated nano-crystallites. The suppression of the superconducting transition temperature for thin films scales linearly with the oxygen impurity concentration and also correlates with the amount of lattice disorder probed by Raman scattering. The best results are obtained by a rapid (12 min) anneal at 850°C with large temperature ramp and cooling rates of ~540°C min-1. Such fast processing suppresses the deleterious oxygen uptake.},
doi = {10.1088/1361-6668/aab4eb},
url = {https://www.osti.gov/biblio/1458621}, journal = {Superconductor Science and Technology},
issn = {0953-2048},
number = 5,
volume = 31,
place = {United States},
year = {Thu Mar 29 00:00:00 EDT 2018},
month = {Thu Mar 29 00:00:00 EDT 2018}
}

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Cited by: 6 works
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Works referencing / citing this record:

Solid-phase reactive inter-diffusion of Mg/B multilayers
journal, February 2019


Control of superconductivity in MgB 2 by ion bombardment
journal, May 2019