Alumina-Doping Effect on Solidification Mechanism of Y-System Superconductors

Izumi, Teruo; Ohtsu, K.; Nakamura, Yūichi; Shiohara, Yuh

doi:10.1007/978-4-431-68305-6_129

Cited by 6 publications

(2 citation statements)

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“…The peritectic temperature of undoped YBCO has been reported to be 1005 ± 10 • C [36], which is consistent with the results of the present study. From figure 3, the corresponding set-point temperature for thermocouple 3 at this temperature is 1110 • C, which is 53 • C and 11 • C greater than that for thermocouples 1 and 2 respectively.…”

Section: Furnace Calibrationsupporting

confidence: 93%

The influence of process parameters on the growth morphology of large-grain Pt-doped YBCO fabricated by seeded peritectic solidification

Chow¹,

Lo²,

Dewhurst³

et al. 1997

Supercond. Sci. Technol.

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We report an investigation of the processing of large-grain Y - Ba - Cu - O (YBCO) containing 0.1, 0.2 and 0.5 wt% platinum (Pt) doping using seeded peritectic solidification in a vertical tube furnace. In this study differential thermal analysis of the Pt-doped YBCO powders and careful temperature calibration of the furnace were performed in order to determine optimum values of the thermal process parameters for each composition. The seeded melt process was observed to be extremely sensitive to the melting temperature, peritectic solidification temperature and cooling rate during grain growth, and failure to optimize these parameters can result in various undesirable effects such as incomplete melting, the nucleation of multiple grains and the formation of local regions of impurity concentration within the sample. Scanning electron microscopy and vibrating sample magnetometry were employed to investigate the microstructure and current-carrying capabilities of the samples. From these, 0.1 wt% Pt doping was determined to be sufficient for the fabrication of melt-processed samples containing fine, sub-micron-sized Y-211 particles which exhibited high critical current densities. No improvement in sample properties was observed for higher levels of Pt doping.

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