Cargando…
The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors
Two MgB(2) samples were prepared using the spark plasma sintering (SPS) technique at different temperatures—950 °C (S1) and 975 °C (S2)—for 2 h under 50 MPa pressure to study the influence of preparation temperature on different facets, namely those perpendicular (PeF) and parallel (PaF) to the comp...
Autores principales: | , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10220533/ https://www.ncbi.nlm.nih.gov/pubmed/37241612 http://dx.doi.org/10.3390/mi14050988 |
_version_ | 1785049240530059264 |
---|---|
author | Zhang, Penghe Zhang, Yufeng Li, Chunyan Zhang, Yan Shen, Shuangyuan Ruan, Guanjie Zhang, Jiaying Noudem, Jacques Guillaume |
author_facet | Zhang, Penghe Zhang, Yufeng Li, Chunyan Zhang, Yan Shen, Shuangyuan Ruan, Guanjie Zhang, Jiaying Noudem, Jacques Guillaume |
author_sort | Zhang, Penghe |
collection | PubMed |
description | Two MgB(2) samples were prepared using the spark plasma sintering (SPS) technique at different temperatures—950 °C (S1) and 975 °C (S2)—for 2 h under 50 MPa pressure to study the influence of preparation temperature on different facets, namely those perpendicular (PeF) and parallel (PaF) to the compression direction of uniaxial pressure during the SPS of MgB(2) samples. We analyzed the superconducting properties of the PeF and PaF of two MgB(2) samples prepared at different temperatures from the curves of the critical temperature (T(C)), the curves of critical current density (J(C)), the microstructures of MgB(2) samples, and the crystal size from SEM. The values of the onset of the critical transition temperature, T(c,onset), were around 37.5 K and the transition widths were about 1 K, which indicates that the two samples exhibit good crystallinity and homogeneity. The PeF of the SPSed samples exhibited slightly higher J(C) compared with that of the PaF of the SPSed samples over the whole magnetic field. The values of the pinning force related to parameters h(0) and K(n) of the PeF were lower than those of the PaF, except for K(n) of the PeF of S1, which means that the PeF has a stronger GBP than the PaF. In low field, the most outstanding performance was S1-PeF, whose critical current density (J(C)) was 503 kA/cm(2) self-field at 10 K, and its crystal size was the smallest (0.24 µm) among all the tested samples, which is consistent with the theory that a smaller crystal size can improve the J(C) of MgB(2). However, in high field, S2-PeF had the highest J(C) value, which is related to the pinning mechanism and can be explained by grain boundary pinning (GBP). With an increase in preparation temperature, S2 showed a slightly stronger anisotropy of properties. In addition, with an increase in temperature, point pinning becomes stronger to form effective pinning centers, leading to a higher J(C). |
format | Online Article Text |
id | pubmed-10220533 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-102205332023-05-28 The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors Zhang, Penghe Zhang, Yufeng Li, Chunyan Zhang, Yan Shen, Shuangyuan Ruan, Guanjie Zhang, Jiaying Noudem, Jacques Guillaume Micromachines (Basel) Article Two MgB(2) samples were prepared using the spark plasma sintering (SPS) technique at different temperatures—950 °C (S1) and 975 °C (S2)—for 2 h under 50 MPa pressure to study the influence of preparation temperature on different facets, namely those perpendicular (PeF) and parallel (PaF) to the compression direction of uniaxial pressure during the SPS of MgB(2) samples. We analyzed the superconducting properties of the PeF and PaF of two MgB(2) samples prepared at different temperatures from the curves of the critical temperature (T(C)), the curves of critical current density (J(C)), the microstructures of MgB(2) samples, and the crystal size from SEM. The values of the onset of the critical transition temperature, T(c,onset), were around 37.5 K and the transition widths were about 1 K, which indicates that the two samples exhibit good crystallinity and homogeneity. The PeF of the SPSed samples exhibited slightly higher J(C) compared with that of the PaF of the SPSed samples over the whole magnetic field. The values of the pinning force related to parameters h(0) and K(n) of the PeF were lower than those of the PaF, except for K(n) of the PeF of S1, which means that the PeF has a stronger GBP than the PaF. In low field, the most outstanding performance was S1-PeF, whose critical current density (J(C)) was 503 kA/cm(2) self-field at 10 K, and its crystal size was the smallest (0.24 µm) among all the tested samples, which is consistent with the theory that a smaller crystal size can improve the J(C) of MgB(2). However, in high field, S2-PeF had the highest J(C) value, which is related to the pinning mechanism and can be explained by grain boundary pinning (GBP). With an increase in preparation temperature, S2 showed a slightly stronger anisotropy of properties. In addition, with an increase in temperature, point pinning becomes stronger to form effective pinning centers, leading to a higher J(C). MDPI 2023-04-30 /pmc/articles/PMC10220533/ /pubmed/37241612 http://dx.doi.org/10.3390/mi14050988 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Zhang, Penghe Zhang, Yufeng Li, Chunyan Zhang, Yan Shen, Shuangyuan Ruan, Guanjie Zhang, Jiaying Noudem, Jacques Guillaume The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors |
title | The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors |
title_full | The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors |
title_fullStr | The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors |
title_full_unstemmed | The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors |
title_short | The Influence of Preparation Temperature on the Different Facets of Bulk MgB(2) Superconductors |
title_sort | influence of preparation temperature on the different facets of bulk mgb(2) superconductors |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10220533/ https://www.ncbi.nlm.nih.gov/pubmed/37241612 http://dx.doi.org/10.3390/mi14050988 |
work_keys_str_mv | AT zhangpenghe theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT zhangyufeng theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT lichunyan theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT zhangyan theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT shenshuangyuan theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT ruanguanjie theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT zhangjiaying theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT noudemjacquesguillaume theinfluenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT zhangpenghe influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT zhangyufeng influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT lichunyan influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT zhangyan influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT shenshuangyuan influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT ruanguanjie influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT zhangjiaying influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors AT noudemjacquesguillaume influenceofpreparationtemperatureonthedifferentfacetsofbulkmgb2superconductors |