The Effect of Grain Growth Temperature on the Trapped Magnetic Field of Y358 Superconductors
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ORIGINAL PAPER
The Effect of Grain Growth Temperature on the Trapped Magnetic Field of Y358 Superconductors M. Başoğlu 1,2 Received: 17 July 2020 / Accepted: 14 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this study, three different Y358 samples were produced by the melt-powder-melt-growth (MPMG) method at different maximum grain growth temperatures of 1030 °C, 1040 °C, and 1050 °C. The differential thermal analysis (DTA), X-ray powder diffraction (XRD), magnetic levitation force, trapped magnetic field values and magnetization measurements were performed. According to the results, the highest magnetic levitation force, the highest critical current density and the highest trapped magnetic field values were obtained from the sample produced at the temperature of 1050 °C. Keywords Y358 superconductor . Magnetic levitation force . Trapped magnetic field . Melt-powder-melt-growth (MPMG)
1 Introduction Various studies have been conducted to increase the transition temperature of superconductors. One of these studies was concerned with the Y3Ba5Cu8O18 + δ (Y358) superconductor, which was discovered in the last decade [1]. According to this study, the transition temperature of the Y358 was above 100 K. In the following studies, the magnetic and electrical properties of the Y358 were improved compared with YBa2Cu3O8 (Y123) [2–5]. The magnetic properties of superconductors are very important for applications like magnetic bearings, trapped field magnets, non-contact transport devices, levitated devices and flywheel energy storage systems. These properties depend on the production method [6, 7]. For example, the magnetic levitation force of a superconductor produced by the melting process is higher than that of one produced by the solid-state reaction method [5]. It has been reported that the bulk superconductor has excellent capabilities to capture magnetic fields. It is well known that the magnetic field trapped by the bulk superconducting magnet is much larger than that of the conventional permanent magnet. When the magnetized bulk
* M. Başoğlu [email protected] 1
Department of Energy Systems Engineering, Gümüşhane University, 29100 Gumushane, Turkey
2
Physics Department, Karadeniz Technical University, 61080 Trabzon, Turkey
superconductor was applied in the levitation system, the levitation performance and carrying capability could be enhanced effectively, since it could be required by the high-speed or super-high-speed transportations in the future [8]. Increasing the critical current density (Jc) and the single-grain size is important for the enhancement of the trapped magnetic field by bulk superconductors [9–11]. One can find quite a number of studies in the literature on the trapped magnetic field of Y123 [12–14]; however, as to our best knowledge, there is no study on the trapped magnetic field of Y358 phase. This study aims to investigate the effect of the grain growth temperature on the trapped magnetic field of YBCO superconductor at a mola
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