Effect of the firing process on the critical current density of YBa 2 Cu 3 O 7-x films derived from the sol-gel method

Wu, Chuanbao; Zhao, Gaoyang; Po, Fang

doi:10.1016/j.matchemphys.2015.10.024

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…According to references [15] and [16], the heat treatment temperature of the YBCO film can be varied over the range of 700-800 • C by adjusting the oxygen partial pressure. By decreasing the heat treatment temperature layer-by-layer, a comparison study was conducted at three YBCO heat treatment temperatures, 700 • C (with P O2 of 17 Pa), 725 • C (with P O2 of 30 Pa) and 740 • C (with P O2 of 40 Pa) (all below 750 • C, the treatment temperature of the middle LaNiO 3 layer) [16].…”

Section: Methodsmentioning

confidence: 99%

An All Sol-Gel Process for the Heteroepitaxial Growth of YBa2Cu3O7−x/LaNiO3/YBa2Cu3O7−x Tri-layer

Zhao

et al. 2017

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Abstract:The preparation of a YBa 2 Cu 3 O 7−x /LaNiO 3 /YBa 2 Cu 3 O 7−x sandwich structured film on a LaAlO 3 (100) substrate by a sol-gel method was investigated. YBa 2 Cu 3 O 7−x /LaNiO 3 /YBa 2 Cu 3 O 7−x tri-layer heterostructures with different epitaxial characteristics can be deposited by controlling the heat treatment temperature. X-ray diffraction and transmission electron microscopy results show that the bottom YBCO film grows epitaxially on the LaAlO 3 substrate along the c axis, and that this epitaxial growth trend is extended to the subsequently deposited LaNiO 3 film. For this reason, the LaNiO 3 film also grows epitaxially along the c axis. Furthermore, this epitaxial growth trend is extended to the top YBa 2 Cu 3 O 7−x film, yielding YBa 2 Cu 3 O 7−x /LaNiO 3 /YBa 2 Cu 3 O 7−x tri-layer heterostructures with epitaxial growth characteristics along the c axis, which enables both the bottom and top YBa 2 Cu 3 O 7−x layers to possess superconducting abilities.

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Section: Methodsmentioning

confidence: 99%

An All Sol-Gel Process for the Heteroepitaxial Growth of YBa2Cu3O7−x/LaNiO3/YBa2Cu3O7−x Tri-layer

Zhao

et al. 2017

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“…The columnar c-axis grains are advantageous for current transport in the ab plane of the YBCO film. The surface of the SIS-20 sample also exhibited a large amount of c-axis grains, but the surface was denser than the SS sample, which is beneficial for high Jc [26]. The surface of the SIS-40 sample was almost c-axis, but a small number of holes appeared; SIS-70 showed a large number of small particles, which would be likely to degrade Jc.…”

Section: Mechanism Of the J C Variationmentioning

confidence: 97%

“…The precursor solution of YBCO films was obtained by dissolving fluorine-contained yttrium, non-fluorine barium, and non-fluorine copper acetate salts into methanol with the help of acrylic acid [25,26]. The total metallic ion concentration of the synthesized precursor solution was 1.2 mol/L.…”

Section: Film Preparationmentioning

confidence: 99%

Enhancement of Critical Current Density by Establishing a YBa2Cu3O7−x/LaAlO3/YBa2Cu3O7−x Quasi-Trilayer Architecture Using the Sol-Gel Method

Wang

2019

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We developed a solution-derived method to establish a YBa 2 Cu 3 O 7−x /LaAlO 3 /YBa 2 Cu 3 O 7−x quasi-trilayer architecture. Using the method, nano-scale pinning sites were induced into the quasi-trilayer architecture and yielded an apparent improvement in the in-field critical current density (J c ) of high-quality YBa 2 Cu 3 O 7−x (YBCO). The improvement in the in-field J c of the films was closely related to the thickness of the LaAlO 3 (LAO) interlayer. In this paper it is demonstrated that when the nominal interlayer thickness approximates 20 nm, which is slightly higher than the roughness of the YBa 2 Cu 3 O 7−x surface, the LaAlO 3 interlayer is discontinuous due to synchromesh-like growth of the LaAlO 3 layer on relatively rough YBa 2 Cu 3 O 7−x surface resulting from the mobility of the solution. Nanoscale defects, such as particles, some amorphous phases, and especially their concomitant lattice defects (such as stacking faults and plane buckling) arise in YBa 2 Cu 3 O 7−x layers. These nanoscale defects could play a role in flux pinning and thus enhancing J c . The effective non-vacuum solution to induce vortex pinning into YBa 2 Cu 3 O 7−x films could be a reference for the further design of an optimal pinning landscape for higher J c .

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Effects of the Sintering Conditions on the Structural Phase Evolution and T C of Bi1.6Pb0.4Sr2Ca2Cu3O7 Prepared Using the Citrate sol–gel Method

Darsono

Yoon

Raju

2016

J Supercond Nov Magn

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The effects of the sintering temperature and time on the phase evolution, microstructure and superconducting properties in a typical Pb-doped Bi-Sr-Ca-Cu-O (BSCCO) system, Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 7 , were examined systematically by X-ray diffraction (XRD), thermo gravimetricdifferential thermal analysis, scanning electron microscopy, and four-point probe resistivity measurements. The samples were prepared by the citrate based sol-gel method using their corresponding nitrates as the starting materials. The samples were sintered at different temperatures, ranging from 820 to 860 • C with different dwell-times (24-120 h). The results showed that the sintering temperature had a significant effect on the structure and superconducting transition temperature ( TC ). XRD showed that when the samples were heat treated at 550 • C, the BSCCO 2201 phase appeared, whereas peaks corresponding to the BSCCO 2112 phase were dominant at 800 • C. At 840 • C, only the peaks corresponding to the BSCCO 2212 and 2223 phases were detected with no impurities. A strong correlation was observed between the structural data and TC ; the samples sintered at 840 • C for 120 h exhibited the maximum T onset C (115.7 K).

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Effect of the firing process on the critical current density of YBa 2 Cu 3 O 7-x films derived from the sol-gel method

Cited by 8 publications

References 18 publications

An All Sol-Gel Process for the Heteroepitaxial Growth of YBa2Cu3O7−x/LaNiO3/YBa2Cu3O7−x Tri-layer

An All Sol-Gel Process for the Heteroepitaxial Growth of YBa2Cu3O7−x/LaNiO3/YBa2Cu3O7−x Tri-layer

Enhancement of Critical Current Density by Establishing a YBa2Cu3O7−x/LaAlO3/YBa2Cu3O7−x Quasi-Trilayer Architecture Using the Sol-Gel Method

Effects of the Sintering Conditions on the Structural Phase Evolution and T C of Bi1.6Pb0.4Sr2Ca2Cu3O7 Prepared Using the Citrate sol–gel Method

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