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Title: Time-Dependent Diffusion Coefficient of Fe in MgB{sub 2} Superconductors

Abstract

The iron (Fe) diffusion in superconducting MgB{sub 2} bulk samples has been studied for sintering time durations of 15 min, 30 min, 1 h, 2 h, and 4 h at 900{sup ∘}C. Fe coating bulk polycrstalline superconducting MgB{sub 2} samples for Fe coating were prepared by pelletizing and used in the diffusion experiments with initial sintering at 800{sup ∘}C for 1 h. A thin layer of Fe was coated on MgB{sub 2} pellets by evaporation in vacuum. Effects of Fe diffusion on the structural, electrical, and superconducting properties of MgB{sub 2} have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), energy-dispersive X-ray spectroscopy (EDS), and resistivity measurements. Fe diffused samples have slightly increased critical transition temperatures and have larger lattice parameter c values, in comparison with bare samples. Fe diffusion coefficients were calculated from depth profiles of c parameter and room temperature resistivity values. Depth profiles were obtained by successive removal of thin layers from Fe diffused surfaces of the samples. Our results have shown that the Fe diffusion coefficient decreases with increasing sintering time and resistivity measurements can be utilized for determination of diffusion coefficient.

Authors:
 [1]
  1. Abant Izzet Baysal University, Department of Physics, Faculty of Arts and Science (Turkey)
Publication Date:
OSTI Identifier:
22771752
Resource Type:
Journal Article
Journal Name:
Journal of Superconductivity and Novel Magnetism
Additional Journal Information:
Journal Volume: 30; Journal Issue: 12; Other Information: Copyright (c) 2017 Springer Science+Business Media, LLC, part of Springer Nature; Article Copyright (c) 2017 Springer Science+Business Media New York; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1557-1939
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; DIFFUSION; EVAPORATION; INFRARED SPECTRA; IRON; LATTICE PARAMETERS; MAGNESIUM BORIDES; PELLETIZING; PELLETS; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY; SINTERING; SUPERCONDUCTORS; SURFACE COATING; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TIME DEPENDENCE; TRANSITION TEMPERATURE; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY

Citation Formats

Ulgen, Asaf Tolga, E-mail: ulgen-at@sirnak.edu.tr, and Belenli, Ibrahim. Time-Dependent Diffusion Coefficient of Fe in MgB{sub 2} Superconductors. United States: N. p., 2017. Web. doi:10.1007/S10948-017-4113-6.
Ulgen, Asaf Tolga, E-mail: ulgen-at@sirnak.edu.tr, & Belenli, Ibrahim. Time-Dependent Diffusion Coefficient of Fe in MgB{sub 2} Superconductors. United States. https://doi.org/10.1007/S10948-017-4113-6
Ulgen, Asaf Tolga, E-mail: ulgen-at@sirnak.edu.tr, and Belenli, Ibrahim. 2017. "Time-Dependent Diffusion Coefficient of Fe in MgB{sub 2} Superconductors". United States. https://doi.org/10.1007/S10948-017-4113-6.
@article{osti_22771752,
title = {Time-Dependent Diffusion Coefficient of Fe in MgB{sub 2} Superconductors},
author = {Ulgen, Asaf Tolga, E-mail: ulgen-at@sirnak.edu.tr and Belenli, Ibrahim},
abstractNote = {The iron (Fe) diffusion in superconducting MgB{sub 2} bulk samples has been studied for sintering time durations of 15 min, 30 min, 1 h, 2 h, and 4 h at 900{sup ∘}C. Fe coating bulk polycrstalline superconducting MgB{sub 2} samples for Fe coating were prepared by pelletizing and used in the diffusion experiments with initial sintering at 800{sup ∘}C for 1 h. A thin layer of Fe was coated on MgB{sub 2} pellets by evaporation in vacuum. Effects of Fe diffusion on the structural, electrical, and superconducting properties of MgB{sub 2} have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), energy-dispersive X-ray spectroscopy (EDS), and resistivity measurements. Fe diffused samples have slightly increased critical transition temperatures and have larger lattice parameter c values, in comparison with bare samples. Fe diffusion coefficients were calculated from depth profiles of c parameter and room temperature resistivity values. Depth profiles were obtained by successive removal of thin layers from Fe diffused surfaces of the samples. Our results have shown that the Fe diffusion coefficient decreases with increasing sintering time and resistivity measurements can be utilized for determination of diffusion coefficient.},
doi = {10.1007/S10948-017-4113-6},
url = {https://www.osti.gov/biblio/22771752}, journal = {Journal of Superconductivity and Novel Magnetism},
issn = {1557-1939},
number = 12,
volume = 30,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2017},
month = {Fri Dec 15 00:00:00 EST 2017}
}