Modification of Magnetic and Electrical Properties of Bi,Pb-2223 Superconductors by Nano-Sized Eu Substitution

被引:0
作者
Mehmet Ersin Aytekin [1 ]
Mustafa Akyol [2 ]
机构
[1] Tarsus University,Vocational School of Technical Sciences at Mersin Tarsus Organized Industrial Zone
[2] Adana Alparslan Türkeş Science and Technology University,Department of Materials Science and Engineering, Faculty of Engineering
关键词
Bi; Pb; Sr; Ca; Cu; Na; O; Bi,Pb-2223 ceramic superconductors; Diamagnetism; SEM; Flux pinning centre;
D O I
10.1007/s10948-025-06993-w
中图分类号
学科分类号
摘要
In the current paper, the effect of nano Eu particle (80 nm) substitution (x = 0.00, 0,025, 0.050, 0.1 and 0.15) in the Bi1.7Pb0.3Sr2Ca1Cu1.75Na0.25Oy on the structural, morphological, magnetic and superconductivity properties was investigated. The solid-state reaction method was used for producing the ceramic samples. The X-ray diffraction (XRD) analysis shows that the Bi-2223 phase with a tetragonal structure is the main phase structure in the ceramic samples. A flaky plate structure separated by grain boundaries has been observed in the scanning electron microscope (SEM). It was found that the grain sizes expanded and the inter-grain bonding increased when nano-sized Eu is added in the host structure. In magnetic hysteresis (M-H) measurements, diamagnetic behaviour, which is characteristic of the Bi-2223 superconductor phase, was observed in all samples. The sample with the best diamagnetic behaviour was substituted with Eu nano particle at a rate of x = 0.1, resulting in an increase in the hysteresis field with the formation of intergranular bonds. Based on M-H measurements performed at temperatures of 15 K and 25 K, the samples’ critical current density (Jc) was determined using the Bean model. The highest critical current density value was calculated in the sample substituted with nano-sized Eu at x = 0.1 rate as a result of improving intergranular connections. Flux pinning forces (Fp) were determined from Jc and B values. Nano-sized Eu particles at a ratio of x = 0.1 improved the pinning forces by acting as flux pinning centres.
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