Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

Öztürk, O.; Asikuzun, E.; Kaya, S.; Erdem, Murat; Safran, Serap; Kılıç, Ahmet; Terzioğlu, C.

doi:10.1007/s10948-015-3003-z

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…However, below this temperature, A1 shows superconducting characteristics with a turning point, namely the resistivity decreases dramatically at 35 K. Meanwhile, along with the cooling provided to sample A2, the critical onset temperature (Tc onset ) is obtained, which is around 80 K, but that of A3 at 40 K. Tc onset shows the point where the temperature of the resistivity decreases dramatically. This clarifies that the vacuum method further reduces the superconductivity following the report of previous research [23].…”

Section: Fig 2 Xrd Pattern Of the Pist Methodssupporting

confidence: 82%

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

et al. 2022

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MgB2/CNT is a promising candidate for superconducting wire application due to its excellent mechanical properties and carbon nanotube’s low density. However, strong interfacial adhesion between the CNT reinforcement and the MgB2 matrix is difficult to manage. Therefore, this study examines the synthesis and characterization of magnesium diboride (MgB2) superconductors with carbon nanotubes (CNTs) and tin (Sn) addition. Determining the proper method and combination of CNT & Sn affects MgB2 superconductors is crucial. Raw materials of magnesium (Mg), boron (B), Sn, and multi-walled carbon nanotubes (MWCNTs) were used for a solid-state reaction process to determine the proper synthesis method and the effect of CNT on superconductors’ critical temperature. Each sample was obtained by weighing the raw material first, followed by hand grinding with agate mortars for 3 hours. The pelletization was then conducted by using a compact pressing machine with a pressure of 350 MPa. The compacted samples were then sintered at 800 °C for 2 hours either through the vacuum or PIST process. Finally, all were characterized, and MgB2 was discovered to be the dominant phase with minor impurity phases such as MgO, Mg, Mg2Sn, C, and Sn. Based on SEM morphological analysis, the grain boundaries of sample A1 were more precise than B2. In both, the grain size also varies, and the distribution of elements is uneven. Subsequently, Cryogenic Magnet Characterization indicated that at 40 K, almost all samples possess superconducting characteristics. For future studies, the potential impact of MgB2 on critical current density (Jc) and magnetic density (Hc) in several commercial applications such as Magnetic Resonance Imaging (MRI), magnetic levitation, and transformers needs to be investigated

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Section: Fig 2 Xrd Pattern Of the Pist Methodssupporting

confidence: 82%

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

et al. 2022

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“…While for the PaF of these MgB 2 bulk samples, they have more obvious microstructural differences among them and more defects, such as the cracks, pores and special particles, than the PeF. There are small anisotropies in the mechanical properties of MgB 2 [26], and the Mg-B bonds of different layers is weaker than the B-B bonds of the same layer [27,28]. It may be the reason that these microstructural defects are more prone to form in the PaF (Mg-B bonds) of the SPSed MgB 2 bulk samples.…”

Section: Resultsmentioning

confidence: 94%

The discrepancies in different facets of MgB₂ bulk superconductors prepared under various sintering durations by spark plasma sintering

Zhang

Lou

et al. 2021

Supercond. Sci. Technol.

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Seven MgB2 bulk superconductors with good superconductivity and crystallinity were prepared under the pressure of 50 MPa at 950 °C and different sintering durations (15 ∼ 240 min) by spark plasma sintering (SPS), with the onset critical temperature (T c,onset) around 37.5 K. The superconducting properties and microstructure measured from the facets perpendicular (PeF) and parallel (PaF) to the compression direction of the SPSed MgB2 bulk samples were also analyzed to investigate the effect of the sintering duration on the MgB2 bulks and the discrepancy between the PeF and the PaF. The optimum performance was obtained from the sample prepared for 45 min for both facets, and the critical current density (J c) measured from the PeF and the PaF are 364 kA cm−2 and 344 kA cm−2 in self field at 20 K, respectively. The PeF exhibits better Jc performance than the PaF at low fields and the PaF exhibits better J c performance than the PeF at high fields. It can be concluded that the sintering duration affects the properties of the PeF mainly by changing their crystallite size. While for the PaF, the sintering duration mainly affects the microstructural defects, such as cracks, pores and secondary phase particles, thus further affecting their J c performances. In terms of the flux pinning mechanism of the SPSed MgB2 bulk samples, the PaF is less susceptible to sintering duration than the PeF, and the better J c performance of the PaF at high fields is due to the stronger grain boundary pinning. It can be also found that the point pinning being stronger at higher temperature is the result of the decreasing anisotropy of MgB2 bulk samples with the temperature.

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“…The main purpose of applying these models is to achieve the theoretical model that is closest to the experimentally obtained microhardness values. Among these models, the model that is most appropriate for the materials exhibiting RISE behavior is generally reported to be the IIC model [18,19]. In the present study, only the IIC model is explained in supporting the theoretical calculations.…”

Section: Microhardness Measurementsmentioning

confidence: 62%

Theoretical and Experimental Comparison of Micro-hardness and Bulk Modulus of Orthorhombic YBa2Cu3-xZnxO Superconductor Nanoparticles Manufactured using Sol-Gel Method

Asikuzun

Öztürk

2020

Sakarya University Journal of Science

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In the present study, the sol-gel method was preferred for the production of superconductor materials since it is known that the sol-gel method is useful in producing nanoparticles. The Zn (Zinc) doped YBCO-123 superconductor samples (YBa2Cu3-xZnxO) were produced. The main objective in the present study was to examine the effects of both of Zn doping and sol-gel method, which was chosen as the production method, on the structural, electrical, and mechanical properties of Y-123 superconductor materials. Especially, the effects of the nanoparticles and doping on the mechanical properties of materials were discussed over the bulk modulus. It was aimed to obtain information about the mechanical properties by comparing the bulk modules calculated theoretically and experimentally. Besides that, the XRD, SEM, and resistivity measurements were performed in order to characterize the structural and electrical properties.

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Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

Cited by 10 publications

References 29 publications

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

The discrepancies in different facets of MgB₂ bulk superconductors prepared under various sintering durations by spark plasma sintering

Theoretical and Experimental Comparison of Micro-hardness and Bulk Modulus of Orthorhombic YBa2Cu3-xZnxO Superconductor Nanoparticles Manufactured using Sol-Gel Method

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Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

Cited by 10 publications

References 29 publications

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

The discrepancies in different facets of MgB2 bulk superconductors prepared under various sintering durations by spark plasma sintering

Theoretical and Experimental Comparison of Micro-hardness and Bulk Modulus of Orthorhombic YBa2Cu3-xZnxO Superconductor Nanoparticles Manufactured using Sol-Gel Method

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The discrepancies in different facets of MgB₂ bulk superconductors prepared under various sintering durations by spark plasma sintering