Annealing experiments on and high-temperature behaviour of the superconductor YBa2Cu3Ox

Brabers, V.A.M.; Jonge, W. J. M. de; Bosch, L.A.; Steen, C. van der; Groote, A.M.W. de; Verheyen, A.A.; Vennix, C.W.H.M.

doi:10.1016/0025-5408(88)90096-7

Cited by 37 publications

(5 citation statements)

References 11 publications

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“…Moreover, the anisotropy of E D is found as follows: E D, ab and E D, c are 0.97 eV [20] and 4.5 eV [21], respectively, where E D, ab and E D, c are E D within the ab-plane and along the c-axis, respectively. Therefore, the value of E D ≈ 0.96 eV obtained in this work is consistent with those of E D deduced from the measurements of oxygen traces [18][19][20]. Since the (110)-YBCO films have the ab-plane perpendicular to the substrate surface, for the (110)-YBCO films it is easier to take molecular oxygen into the film than for the c-YBCO films [21,22].…”

Section: Resultssupporting

confidence: 90%

“…Brabers et al [18] reported E D ≈ 0.9-1.3 eV using sintered bulk YBCO, and Tu et al [19] reported E D ≈ 1.3 and 0.5 eV for x = 0 and 0.38 using sintered bulk YBCO, respectively. Moreover, the anisotropy of E D is found as follows: E D, ab and E D, c are 0.97 eV [20] and 4.5 eV [21], respectively, where E D, ab and E D, c are E D within the ab-plane and along the c-axis, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Control of crystal orientation in YBCO thin films by an oxygen diffusion process

Uchiyama¹,

Iguchi²

2004

Supercond. Sci. Technol.

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We report the orientation control of Y Ba2Cu3O7−x (YBCO) thin films with high crystallinity, high critical temperature (Tc) and narrow transition width (ΔTc). YBCO thin films with c-axis orientation, a-axis orientation and (110) orientation are prepared by deposition on SrTiO3 (100) and (110) substrates using a dc magnetron sputtering system. No post-annealing process is introduced. With decreasing deposition rate (Rd), Tc increases and ΔTc narrows, which suggests a linear relation between Rd and the oxygen diffusion coefficient. We conclude that molecular oxygen is effectively taken into the film during the sputtering process by the acquiring of the activation energy of 0.96 eV, as oxygen diffusion.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Control of crystal orientation in YBCO thin films by an oxygen diffusion process

Uchiyama¹,

Iguchi²

2004

Supercond. Sci. Technol.

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“…The oxygen deficiency δ increases with increasing temperature above 400 o C [1]. The carrier density decreases with increasing δ, which results in a steep increase of the resistivity [2][3][4]. In other words, the material shows a positive temperature coefficient of resistivity (PTCR).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Hot Spot Oxygen Sensor Using GdBa2Cu3O7-δ Ceramic Rod with Gd2BaCuO5 Core

Fujihara

Kuroki

Okamoto

et al. 2010

KEM

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A ceramic rod of GdBa2Cu3O7-δ with Gd2BaCuO5 core was prepared using a dip coater and sintered at 950oC. A hot spot appeared when a certain voltage was applied to the rod. Oxygen sensing characteristics of the rod were investigated. It was found that the response time of the oxygen sensor using the rod with the core was shorter than that without the core, because the length of the oxygen diffusion in GdBa2Cu3O7-δ part in the rod with the core was shorter than that without the core.

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“…Oxygen deficiency δ increases with increasing temperature above 400 o C [1]. The carrier density decreases with increasing δ, which results in a steep increase of the resistivity [2][3][4]. In other words, the material shows a positive temperature coefficient of resistivity (PTCR).…”

Section: Introductionmentioning

confidence: 99%

Hot Spot Oxygen Sensor Using GdBa2 Cu3O7-δ-Based Composite Ceramics

Okamoto

Iihama

Takata

2006

AMR

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Ceramic rods of GdBa 2 Cu 3 O 7-δ -based composites with BaAl 2 O 4 and Gd 2 BaCuO 5 were prepared by solid-state reaction. When a certain voltage was applied to the rod, electric current decreased abruptly, and a hot spot appeared. After the appearance of the hot spot, the current remained constant with increasing voltage. The maximum withstanding electric-power for the rods significantly increased upon adding BaAl 2 O 4 and Gd 2 BaCuO 5 . The current after the appearance of the hot spot depended on the oxygen partial pressure in the ambient atmosphere. For the GdBa 2 Cu 3 O 7-δ rod, the current oscillated under low oxygen partial pressure. In contrast, the composite rods showed stable sensing characteristics, which resulted in the improvement of response under low oxygen partial pressure. Compared with the BaAl 2 O 4 -added composite, the Gd 2 BaCuO 5 -added composite rod showed a high durability for sensing applications even in high oxygen partial pressure.All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications Ltd, www.scientific.net.

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Annealing experiments on and high-temperature behaviour of the superconductor YBa2Cu3Ox

Cited by 37 publications

References 11 publications

Control of crystal orientation in YBCO thin films by an oxygen diffusion process

Control of crystal orientation in YBCO thin films by an oxygen diffusion process

Characteristics of Hot Spot Oxygen Sensor Using GdBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> Ceramic Rod with Gd<sub>2</sub>BaCuO<sub>5</sub> Core

Hot Spot Oxygen Sensor Using GdBa<sub>2</sub> Cu<sub>3</sub>O<sub>7-δ</sub>-Based Composite Ceramics

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