Effect of using two different starting materials (nitrates and carbonates) and a calcination processes on the grain boundary properties of a BSCCO superconductor

Abstract

The influence of using two different starting materials (nitrates and carbonates) and calcination processes on the grain boundary properties of a BSCCO system have been investigated. Superconducting BSCCO samples with the chemical composition Bi1.64Pb0.34Sr2Ca2Cu3Oy were successfully fabricated by the sol–gel method. X-ray diffraction (XRD) and scanning electron microscopy analyses have been used to study the phase formation and microstructure of the prepared samples, respectively. The DC electrical resistivity, critical current density, and AC susceptibility of the samples were measured. The XRD result showed that one can improve the phase formation of the Bi-2223 system by choosing suitable starting materials and the temperature of calcination. AC susceptibility and DC electrical resistivity revealed that the synthesis process improves the grain boundaries. The critical current density (measured in 77 K) increased from 100 A cm−2 to about 145 A cm−2. In fact, the critical current of the sample fabricated with a carbonates group and calcinated at 750 °C obtained 100 A cm−2, while a sample that was fabricated with a nitrates group and calcinated at 790 °C had the critical current of 145 A cm−2.

Critical Current Density and Meissner Effect of Smart Meta-Superconductor MgB2 and Bi(Pb)SrCaCuO

“…This finding is completely contrary to the results observed for the conventional superconductor MgB 2 . The J C of pure B(P)SCCO is comparable to that of references [ 52 , 53 , 54 ]. Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ +Ag luminescent inhomogeneous phase doping increases the J C of B(P)SCCO, and the J C of C-series samples with the smallest particle size increases the most.…”

“…Figure 3 e,f demonstrate the relationship between J C and temperature of pure B(P)SCCO (C1) and B(P)SCCO doped with 0.3 wt% Y 2 O 3 :Sm 3+ (C2), 0.3 wt% Y 2 O 3 (C3), 0.3 wt% Y 2 O 3 :Eu 3+ (C4), 0.3 wt% Y 2 O 3 :Eu 3+ +Ag (C5), 0.4 wt% Y 2 O 3 :Eu 3+ (C6), and 0.4 wt% Y 2 O 3 :Eu 3+ +Ag (C7). The J C of B(P)SCCO (A1), B(P)SCCO (B1), and B(P)SCCO (C1) are 103, 70, and 54 A/cm 2 at 90 K. The figures show that the J C of all samples decreases with the increase in temperature, which is consistent with [ 51 , 52 ]. The J C of all samples decreases rapidly at lower temperature and slows down at higher temperature.…”

Green-Light GaN p-n Junction Luminescent Particles Enhance the Superconducting Properties of B(P)SCCO Smart Meta-Superconductors (SMSCs)

“…From the graphs, it can be seen that J C decreases with the increasing temperature, with a faster decrease in the low-temperature range and a slower decrease at higher temperatures. The J C decreased to a minimum at the onset transition temperature T C,on , consistent with the relationship between the critical current J C and temperature T reported in the literature [68,69]. The increase in grain boundaries in the B-series samples prepared from smaller raw material sizes compared to the A-series samples led to poorer connectivity, resulting in a lower critical current density J C for the B-series samples at the same temperature as the A-series samples [66,67].…”

AC Magnetic Susceptibility: Mathematical Modeling and Experimental Realization on Poly-Crystalline and Single-Crystalline High-Tc Superconductors YBa2Cu3O7−δ and Bi2−xPbxSr2Ca2Cu3O10+y

“…The most popular ones are based on the coaxial adjustment of one, two and four PUCs, in the so-called zeroth-, first-and second-derivative configuration [3][4][5][6][7][8]. Due to the flexibility in the choice of PUC configuration and the relatively low-cost realization, ACMS is surely one of the most popular among the plethora of important experimental techniques used to assess the properties of magnetic [9][10][11][12][13] and superconducting [14][15][16][17][18][19][20][21] materials from room temperature down to cryogenic conditions [1]. Also, referring to dynamic phenomena, due to its inherent versatility in the frequency domain (from Hz to tens of kHz), ACMS is the technique of choice in many areas of physics and materials science used to investigate out-of-equilibrium processes such as domain wall motion and domain reversal in ferromagnets [9,10], and flux flow and creep/depinning of vortices in superconductors [1,14,16,20,21].…”