X-ray Micro-Tomography as a New and Powerful Tool for Characterization of MgB2 Superconductor

Aldica, G.; Tiseanu, Ion; Badica, P.; Rindfleisch, Mattew

doi:10.5772/10125

Cited by 2 publications

(3 citation statements)

References 28 publications

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“…The facility was constructed at NILPRP, Magurele, Romania, with European Community support, and details are given elsewhere. 18 Conventional transmission electron microscopy (TEM), high resolution HRTEM, and selected area electron diffraction (SAED) were performed by using a JEOL 2100 microscope with an integrated energy dispersive X-ray spectrometer (EDS). We also observed the samples by a scanning electron microscope (SEM) TESCAN Lyra3XMU equipped with an EDS Bruker Quantax 200 detector.…”

Section: Methodsmentioning

confidence: 99%

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Growth of SrTiO₃ Single Crystals with a Diameter of about 30 mm by the Verneuil Method

Tateno

Endo

Arisawa

et al. 2018

Crystal Growth & Design

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The work demonstrates growth by the Verneuil method of SrTiO3 single crystals of 30 mm in diameter. Experiments are performed under an industrial environment. Growth was for 4.75 h, i.e., within one production shift. The optimum growth conditions for which the length of the region with bubbles D is zero and the effective length EL (i.e., the crystal length of commercial value) is maximized are for the amount of SrCO3 additive of ∼3 wt % and for H2 outer flow rate of ∼35 L/min. These two parameters show the strongest influence on the bubble-free growth, but other growth parameters (H2 inner flow rate, O2 flow rate increase, rotation speed) were also optimized. Selected crystals are characterized from the structural, microstructural, optical, and THz spectroscopy viewpoints, and they are compared with a commercial substrate and with crystals reported in the literature. This work opens the possibility for the industrial growth of large SrTiO3 single crystals and commercialization of large area substrates.

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Section: Methodsmentioning

confidence: 99%

“…Crystals were investigated by X-ray tomography. The facility was constructed at NILPRP, Magurele, Romania, with European Community support, and details are given elsewhere …”

Section: Experimental Sectionmentioning

confidence: 99%

Growth of SrTiO₃ Single Crystals with a Diameter of about 30 mm by the Verneuil Method

Tateno

Endo

Arisawa

et al. 2018

Crystal Growth & Design

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“…The XRD [17] results proved that the Nb barrier is important for obtaining pure MgB 2 material in wire. However, the studies presented in [23] shows that sometimes the Nb barrier could break during processing. These studies specifically focused on defect-laden samples.…”

Section: Sem Resultsmentioning

confidence: 99%

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure

Gajda

Zaleski

Morawski

et al. 2015

Supercond. Sci. Technol.

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In this paper we present the results of critical current (I c ) measurements of MgB 2 wires made with two different set-ups of the four-point probe method: current sweep type-constant magnetic field and increasing current, and field sweep type-constant current and rapidly increasing magnetic field. Results from magnet field sweep type measurements can be interpreted by a new physical concept-a jump of the electric field in low magnetic fields. This physical concept can be correlated with damages in the Nb-barrier existing in the MgB 2 wire and be employed as a detection scheme. The damage in Nb barrier reduces critical current density (J c ) and complicates the study on critical temperature (T c ), upper critical field (B c2 ), irreversible magnetic field (B irr ), pinning force (F p ), and pinning centers in superconducting MgB 2 wires. Our proposed method to detect damages in Nb barrier would benefit efforts in development and applications of MgB 2 wires.

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X-ray Micro-Tomography as a New and Powerful Tool for Characterization of MgB2 Superconductor

Cited by 2 publications

References 28 publications

Growth of SrTiO₃ Single Crystals with a Diameter of about 30 mm by the Verneuil Method

Growth of SrTiO₃ Single Crystals with a Diameter of about 30 mm by the Verneuil Method

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure

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X-ray Micro-Tomography as a New and Powerful Tool for Characterization of MgB2 Superconductor

Cited by 2 publications

References 28 publications

Growth of SrTiO3 Single Crystals with a Diameter of about 30 mm by the Verneuil Method

Growth of SrTiO3 Single Crystals with a Diameter of about 30 mm by the Verneuil Method

The electric field jump—detection of damaged Nb barrier in MgB2wires annealed under pressure

Contact Info

Product

Resources

About

Growth of SrTiO₃ Single Crystals with a Diameter of about 30 mm by the Verneuil Method

Growth of SrTiO₃ Single Crystals with a Diameter of about 30 mm by the Verneuil Method

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure