“…Our earlier studies showed that Er-rich system (Gd 0.33 Y 0.33-x Er 0.33 + x )-123 bulk superconductor with x = 0.2 had the best properties [ 11 ]. Figure 5 shows the semilogarithmic plot of the J c ( B ) dependence at various temperatures.…”
Section: Resultsmentioning
confidence: 99%
“…According to the spectral analysis, the dark areas (supposedly matrix) comprise of Gd, Y, and Er in equal ratio, whereas the bright areas (RE211) are Er-rich. Quantitative analysis of the microstructure can be found elsewhere [ 11 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The liquid phase preform was supported by Y 2 O 3 and MgO single crystals to prevent liquid loss of LP during processing for achieving single-grain growth by infiltration growth (IG) process. The temperature profile for fabrication (Gd,Y,Er)123 bulk sample can be found elsewhere [ 11 ]. The oxygen annealing was done for 400 h at 500–375 °C in continuous oxygen flow (flow rate = 0.3 l/min).…”
Section: Methodsmentioning
confidence: 99%
“…Superconductors must be cheap, advanced in properties, and mass producible. In light of this theme, we developed a new ternary bulk high temperature rare-earth cuprate superconductor (REBa 2 Cu 3 O 7-x also known as REBCO or RE123) comprised of Gd, Dy, and Er via infiltration growth (IG) technique [ 11 ]. The main advantage of this ternary system with respect to already known ternary compounds (Nd,Eu,Gd)Ba 2 Cu 3 O 7-x , (Nd,Sm,Gd)Ba 2 Cu 3 O 7-x , (Sm,Eu,Gd)Ba 2 Cu 3 O 7-x , etc.…”
Progress in the mass production of newly developed bulk (Gd0.33Y0.13Er0.53)Ba2Cu3Oy “(Gd,Y,Er)123” and MgB2 systems is presented. Two batches of (Gd,Y,Er)123 pellets of 20 mm diameter and 7 mm thick were prepared in air by an infiltration growth “IG” process. Trapped field distribution profiles of fully grown bulk samples clearly showed that all samples were single-grain and the trapped field values were more than 0.5 T at 77 K, 1.3 mm above top surface. The best bulk exhibited the trapped field value of 0.63 T at 77 K. Ultra-sonication technique was employed for refining precursors of both (Gd,Y,Er)211 and boron. TEM studies revealed that boron powder subjected to ultrasonication was refined up to nanoscale. The micron-sized particles were reduced to nanoscale, which led to improvement of critical current by up to 36% in bulk MgB2 at 20 K and self-field. This progress in fabrication of high-performance LREBa2Cu3Oy and MgB2 superconducting bulks further promotes commercialization of superconductors’ production as a mode of sustainable technology.
“…Our earlier studies showed that Er-rich system (Gd 0.33 Y 0.33-x Er 0.33 + x )-123 bulk superconductor with x = 0.2 had the best properties [ 11 ]. Figure 5 shows the semilogarithmic plot of the J c ( B ) dependence at various temperatures.…”
Section: Resultsmentioning
confidence: 99%
“…According to the spectral analysis, the dark areas (supposedly matrix) comprise of Gd, Y, and Er in equal ratio, whereas the bright areas (RE211) are Er-rich. Quantitative analysis of the microstructure can be found elsewhere [ 11 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The liquid phase preform was supported by Y 2 O 3 and MgO single crystals to prevent liquid loss of LP during processing for achieving single-grain growth by infiltration growth (IG) process. The temperature profile for fabrication (Gd,Y,Er)123 bulk sample can be found elsewhere [ 11 ]. The oxygen annealing was done for 400 h at 500–375 °C in continuous oxygen flow (flow rate = 0.3 l/min).…”
Section: Methodsmentioning
confidence: 99%
“…Superconductors must be cheap, advanced in properties, and mass producible. In light of this theme, we developed a new ternary bulk high temperature rare-earth cuprate superconductor (REBa 2 Cu 3 O 7-x also known as REBCO or RE123) comprised of Gd, Dy, and Er via infiltration growth (IG) technique [ 11 ]. The main advantage of this ternary system with respect to already known ternary compounds (Nd,Eu,Gd)Ba 2 Cu 3 O 7-x , (Nd,Sm,Gd)Ba 2 Cu 3 O 7-x , (Sm,Eu,Gd)Ba 2 Cu 3 O 7-x , etc.…”
Progress in the mass production of newly developed bulk (Gd0.33Y0.13Er0.53)Ba2Cu3Oy “(Gd,Y,Er)123” and MgB2 systems is presented. Two batches of (Gd,Y,Er)123 pellets of 20 mm diameter and 7 mm thick were prepared in air by an infiltration growth “IG” process. Trapped field distribution profiles of fully grown bulk samples clearly showed that all samples were single-grain and the trapped field values were more than 0.5 T at 77 K, 1.3 mm above top surface. The best bulk exhibited the trapped field value of 0.63 T at 77 K. Ultra-sonication technique was employed for refining precursors of both (Gd,Y,Er)211 and boron. TEM studies revealed that boron powder subjected to ultrasonication was refined up to nanoscale. The micron-sized particles were reduced to nanoscale, which led to improvement of critical current by up to 36% in bulk MgB2 at 20 K and self-field. This progress in fabrication of high-performance LREBa2Cu3Oy and MgB2 superconducting bulks further promotes commercialization of superconductors’ production as a mode of sustainable technology.
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