Nano- Al2O3 particle addition effects on Y Ba2Cu3Oy superconducting properties

Influence of WO3 nanowires on structural, morphological and flux pinning ability of YBa2Cu3Oy superconductor

Investigation of the impact of nano-sized wires and particles TiO2 on Y-123 superconductor performance

We report dc transport and magnetization measurements of Jc in MgB2 wires fabricated by the powder-in-tube method, using commercial MgB2 powder with 5 %at Mg powder added as an additional source of magnesium, and stainless steel as sheath material. By appropriate heat treatments, we have been able to increase Jc by more than one order of magnitude from that of the as-drawn wire. We show that one beneficial effect of the annealing is the elimination of most of the micro-cracks, and we correlate the increase in Jc with the disappearance of the weak-link-type behavior.

Microstructure and high critical current of powder in tube MgB2

In the present investigation, we report a systematic study of Ag admixing in MgB2 prepared by solid-state reaction at ambient pressure. All the samples in the present investigation have been subjected to structural/ microstructural characterization employing x-rays diffraction (XRD) and transmission electron microscopic (TEM) techniques. The magnetization measurements were performed by physical property measurement system (PPMS). The TEM investigations reveal the formation of MgAg nanoparticles in Ag admixed samples. These nanoparticles may enhance critical current density due to their size (~5-20 nm) compatible with coherence length of MgB2 (~5-6 nm). In order to study the flux pinning effect of Ag admixing in MgB2, the evaluation of intragrain critical current density (Jc) has been carried out through magnetic measurements on the fine powdered version of the as synthesized samples. The optimum result on intragrain Jc is obtained for 10 at.% Ag admixed sample at 5K. This corresponds to 9.23x10^7 A/cm^2 in self-field,5.82x10^7 A/cm^2 at 1T,4.24 x10^6 A/cm^2 at 3.6T and 1.52x10^5 A/cm^2 at 5T. However, intragrain Jc values for MgB2 sample without Ag admixing are 2.59x10^6 A/cm^2,1.09x10^6A/cm^2,4.53x10^4 A/cm^2 and 2.91x10^3A/cm^2 at 5 K in self field, 1T, 3.6T and 5T respectively.. The high value of intragrain Jc for Ag admixed MgB2 superconductor has been attributed to the inclusion of MgAg nanoparticles into the crystal matrix of MgB2, which are capable of providing effective flux pinning centres. A feasible correlation between microstructural features and superconducting properties has been put forward.

High critical current density and improved flux pinning in bulk MgB2 synthesized by Ag addition

Flux pinning and the peak effect of YxHo1-xBa2Cu3Oy melt-textured samples fabricated by a powder-melting-process method are investigated by a SQUID magnetometer in a magnetic field parallel to the c-axis of the samples. It has been found that the partial substitution of Ho for Y can lead to a strong enhancement of flux pinning over a wide temperature and field range in melt-textured YBa2Cu3Oy samples. A Jc value as high as 1.3×105 A cm-2 at 77 K and in self-field has been achieved in the Y0.4Ho0.6Ba2Cu3Oy sample. The enhancement of flux pinning may be attributed to the reduction of Y2BaCuO5 particles, the higher density of stacking faults and the paramagnetic moment of Ho3+. Contrary to the pure YBa2Cu3Oy sample, a peak effect can be observed below 77 K in H∥c in the Ho-added superconductors.

Improved flux pinning in YxHo1-xBa2Cu3Oy fabricated by powder melting process

The Y 1− x Ho x Ba 2 Cu 3 O y ( x =0, 0.2, 0.4 and 0.6) bulk samples were prepared by a `powder melting process' method. Their microstructure, critical current density and flux pinning behavior were investigated by TEM and SQUID magnetometer. The results indicate that J c and flux pinning can be significantly improved by Ho substitution for Y. The normalized pinning force is found to be well scaled with the reduced magnetic field ( h = H / H irr ) and shows a peak at h max =0.4 in the Y 0.4 Ho 0.6 Ba 2 Cu 3 O y sample, which is much higher than that in pure YBCO specimen. Many submicron binary RE211 particles and high density of stacking faults are observed in the Ho-doped samples, which may be responsible for the enhancement of J c . Also, the paramagnetic moment of Ho has a large contribution to the increase in J c .

Influence of Ho substitution for Y on flux pinning in melt-processed YBCO superconductors

YBa 2 Cu 3 O y samples with varying Y 2 BaCuO 5 (211) second-phase concentrations have been prepared using the submicron-sized 211 precursors by a powder melting process method and their critical current density ( J c ), flux pinning and microstructure have been investigated. The microstructural observations show that most 211 particles in the sample are submicron in diameter (as small as 300 nm), which can work as effective pinning centers. J c in low fields increases monotonously with increasing the 211 concentration. A high irreversibility field above 7 T at 77 K in H ∥ c is observed in these samples. A very high J c value of 1.6×10 5 A/cm 2 at 77 K in self-field has been achieved in the sample with 25% 211 addition. A plateau-region of J c versus field (as high as 60 000 A/cm 2 at 77 K) is also obtained, which is very promising for applications. In addition, the scaling of pinning force as a function of the reduced field gives a peak position of 0.33 which is an indication of pinning provided by normal conducting 211 particles.

Improved flux pinning in PMP YBa2Cu3Oy superconductors by submicron Y2BaCuO5 addition

We have studied the magnetotransport, magnetization properties, and microstructure of multifilamentary (Bi–Pb)2Sr2Ca2Cu3Ox (Bi-2223)/Ag tapes with varying filaments from 1 to 37 to explore the energy dissipation, reversible flux motion, and flux pinning related to the microstructure. Our results show that the dissipation is temperature, current, and magnetic field induced. The dissipation is thermally activated and the vortex liquid state is plastically deformed. The dissociation of vortex–antivortex pairs by current, magnetic field, and temperature plays a major role in enhancing the dissipation process, resulting in large broadening in the transition. We observed a reversible fluxoid motion of vortices. The critical current density follows an exponential dependence on the magnetic field. The weak links seem to be broken even for a field as low as 5 G even 12 K below the transition temperature. However, at low temperature, the weak links behave as superconducting. The microscopic characterizations show e...

Flux pinning and dissipation in textured multifilamentary (Bi–Pb)2Sr2Ca2Cu3Ox/Ag tapes

Dense MgB2/Cu wires with Ta as a buffer layer were successfully fabricated by the powder-in-tube (PIT) method. The microstructure was investigated by optical microscopy. Magnetization measurements were carried out by using a superconducting quantum interference device (SQUID) magnetometer at magnetic fields up to 7 T from 5 K to 35 K. The transition temperature of the MgB2 wire is around 38.4 K and the irreversibility field is 6.6 T at 5 K. The critical current density as high as 105 A cm−2 (5 K, self-field) and 104 A cm−2 (20 K, 1 T) has been obtained. The results suggest that the powder-in-tube (PIT) process is promising in preparing high-quality MgB2 wires.

https://iopscience.iop.org/article/10.1088/0953-2048/15/1/303/pdf

Fabrication and superconducting properties of MgB2 composite wiresby the PIT method

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