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

Journal Article · · Superconductor Science and Technology

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; 17-ERD-040
OSTI ID:
1458621
Report Number(s):
LLNL-JRNL-743108; 898052
Journal Information:
Superconductor Science and Technology, Vol. 31, Issue 5; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (3)

Review of hydro-instability experiments with alternate capsule supports in indirect-drive implosions on the National Ignition Facility journal July 2018
Solid-phase reactive inter-diffusion of Mg/B multilayers journal February 2019
Control of superconductivity in MgB 2 by ion bombardment journal May 2019

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