Synthesis temperature of Ba4CuPt2O9 compounds and the influence of their addition on the orientation of the c-axes of fluorine-doped YBCO superconductors

Hamada, Tomofumi; Morimo, R.; Takada, Akio; Yamashita, Yoshifumi; Nakayama, K.; Nagata, Kohei; Yuji, Toshifumi

doi:10.1016/s0924-0136(99)00474-4

Cited by 1 publication

(2 citation statements)

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“…[11,12]. In case of Pt and PtO 2 addition, it was seen that a new Ba 4 CuPt 2 O 9 phase forms, which acts as nucleating site for Y211, thereby restraining the Y211 growth [12]. In addition, there is also evidence that adding Pt/PtO 2 results in more anisotropic and highly acicular Y211 particles.…”

Section: Introductionmentioning

confidence: 96%

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Effect of Ultra-sonicated Y2BaCuO5 on Top-Seeded Melt Growth YBa2Cu3Oy Bulk Superconductor

Pinmangkorn

Muralidhar

Arvapalli

et al. 2020

J Supercond Nov Magn

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In this work, we tried to improve the superconducting performance of bulk YBa 2 Cu 3 O y (Y123) superconductors via Y 2 Ba 1 Cu 1 O 5 (Y211) secondary phase refinement. A novel method of ultra-sonication was used to refine the Y211 secondary phase particles. The Y211 powder was treated by ultra-sonication for 0 to 80 min with steps of 20 min, keeping the power (300 W) and frequency (20 kHz) constant. For synthesis of the YBCO bulk, we employed top-seeded melt growth (TSMG) with Pt addition. Magnetization measurements showed a superconducting transition temperature at around 91 K, irrespective of ultrasonication parameters. Interestingly, critical current density and trapped field were found to be proportional to the ultra-sonication duration. YBCO bulk sample (20 mm diameter, 7 mm in thickness) fabricated for 80 min ultra-sonicated Y211 showed a maximum trapped field of 0.42 T at 77 K, 0.3 mm above the top surface. The improved trapped field values are explained on the basis of improvements in the microstructure. Keywords YBa 2 Cu 3 O y. Y 2 BaCuO 5. Top-seeded melt growth. Ultra-sonication. Critical current density

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Section: Introductionmentioning

confidence: 96%

“…Several researchers have tried to avoid Y211 particles coarsening with help of chemical agents such as Pt, CeO 2 , etc. [11,12]. In case of Pt and PtO 2 addition, it was seen that a new Ba 4 CuPt 2 O 9 phase forms, which acts as nucleating site for Y211, thereby restraining the Y211 growth [12].…”

Section: Introductionmentioning

confidence: 97%