Effects of PtO2 and CeO2 additives on the microstructures of the quenched melts of Y–Ba–Cu–O materials

Riches, James D.; Alarco, José A.; Barry, John C.

doi:10.1016/s0921-4534(00)00025-3

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…Clearly, the known coarsening phenomenon is limited on such Y-211 nano-particles, which is very different from the result observed in nano-Y-211 doped YBCO samples fabricated using TSMG technique [8]. The reasons are concluded as followings: (i) the sample in this study is fabricated using TSIG process, and previous study has proved that this method can introduce more and smaller Y-211 inclusions than TSMG technique [5]; (ii) the addition of CeO 2 in SSP helps to limit the Ostwald ripening of the Y-211 particles [36]; (iii) the Y-211 nano-particles spontaneously formed during processing may have different growing and coarsening mechanisms with the artificially synthesized nano-Y-211. Additionally, the amount of nano-Y-211 inclusions is much higher than that of micro-Y-211 large particles, so these small nano-inclusions can act as more effective sources of pinning centers.…”

Section: Measurements Of Microstructure and Local Superconductivity: mentioning

confidence: 60%

Enhanced superconducting properties in infiltration processed Y–Ba–Cu–O single-grain superconductor with nano-sized pinning centers

Wang

Yang

2015

Journal of Alloys and Compounds

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Section: Measurements Of Microstructure and Local Superconductivity: mentioning

confidence: 60%

Enhanced superconducting properties in infiltration processed Y–Ba–Cu–O single-grain superconductor with nano-sized pinning centers

Wang

Yang

2015

Journal of Alloys and Compounds

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“…Clearly, the known coarsening phenomenon is limited on such Y‐211 nanoparticles, which is very different from the result observed in nano‐Y‐211 doped YBCO samples fabricated using TSMG technique . The reasons are concluded as followings: (i) the sample in this study is fabricated using TSIG process, and previous study has proved that this method can introduce more and smaller Y‐211 inclusions than TSMG technique; (ii) the addition of CeO 2 in SSP helps to limit the Ostwald ripening of the Y‐211 particles; (iii) the Y‐211 nano‐particles spontaneously formed during processing may have different growing and coarsening mechanisms with the artificially synthesized nano‐Y‐211.…”

Section: Resultsmentioning

confidence: 99%

A Novel Top‐Seeded Infiltration Growth Technique for Fabricating Y–Ba–Cu–O Single‐Grain Superconductor Nano‐Composites

Dong

Deng

2015

J. Am. Ceram. Soc.

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Top-seed infiltration and growth technique (TSIG) is proposed to fabricate Y-Ba-Cu-O (YBCO) single-grain superconductor nano-composites, in which a solid source composition of nano-Y 2 O 3 + BaCuO 2 and a liquid source composition of Y 2 O 3 + 10BaO + 16CuO are employed. As can be seen, this novel technique uses just one source of precursor powder of BaCuO 2 , so it is more simplified and efficient. Microstructural observation indicates that fine Y 2 BaCuO 5 (Y-211) inclusions with a size from dozens of nanometers to about one hundred nanometers are successfully introduced in YBa 2 Cu 3 O 7 -X (Y-123) superconducting matrix, which can act as more effective pinning centers for improving the bulk performance. Superconducting property measurement shows that, a maximum trapped field of 0.36044 T is present at the center of the sample after magnetization by a permanent magnet (B = 0.5 T). These results prove that our proposed TSIG technique is a practical method for fabricating YBCO bulk superconductor nano-composites with high performance.

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“…Here, we would like to discuss on the origin of decrease of the Er211's size with addition from the relationship between the size of RE211 particles in RE123 matrix and viscosity of melt as shown the below formula [3], which is led by Navie-Stokes equation and Stokes-Einstein's formula where, , , , and are critical radius which is the smallest size of the RE211 particles trapped in the RE123 crystal growth front, interfacial energy, viscosity of melt, and the RE123 crystal growth rate. The addition with increases viscosity of melt [4], suggesting that the increase of viscosity leads to the decrease of and smaller Er211 particles in melt are trapped in Er123 matrix. Therefore, decrease of the size of Er211 with addition can be understood in terms of the decrease of due to increase of the viscosity of the melt.…”

Section: Methodsmentioning

confidence: 99%

Relationship Between Critical Current Properties and Microstructure of Er123 Melt-Solidified Bulks

Nakashima

Maruyama

Honzumi

et al. 2005

IEEE Trans. Appl. Supercond.

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We report impurities doping effectors of Pt and/or CeO 2 of microstructures, critical temperatures and critical current density ( c ) in both -growth and -growth regions of the ErBa 2 Cu 3 O (Er123) melt-solidified bulks. The volume fraction of the Er 2 BaCuO 5 (Er211) particles in Er123 matrix was always lower in the -growth region than in the -growth region. However, the second peaks of c curves were more prominent in the -growth region and its maximum c value reached 53 kA cm 2 at 77 K under a magnetic field of 1 T for the bulk of the co-doping of 0.5 wt% Pt and 1.0 wt% CeO 2 . Whereas the Er211 particles were finely dispersed in Er123 matrix in each case of Pt-or CeO 2 -addition, the co-doping of Pr and CeO 2 showed most refined effect of the dispersion of Er211 particles. From the results of microstructures and c , c value at zero field was found to be systematically improved with the reduction of diameter of the Er211 particles.Index Terms-Addition of Pt and CeO 2 , -growth region and -growth region, finely dispersion of RE211, pushing and trapping.

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Effects of PtO2 and CeO2 additives on the microstructures of the quenched melts of Y–Ba–Cu–O materials

Cited by 10 publications

References 38 publications

Enhanced superconducting properties in infiltration processed Y–Ba–Cu–O single-grain superconductor with nano-sized pinning centers

Enhanced superconducting properties in infiltration processed Y–Ba–Cu–O single-grain superconductor with nano-sized pinning centers

A Novel Top‐Seeded Infiltration Growth Technique for Fabricating Y–Ba–Cu–O Single‐Grain Superconductor Nano‐Composites

Relationship Between Critical Current Properties and Microstructure of Er123 Melt-Solidified Bulks

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