Growth model and the effect of CuO nanocrystallites on the properties of chemically derived epitaxial thin films of YBa2Cu3O7−x

Araki, Takao; Niwa, T.; Yamada, Yutaka; Hirabayashi, I.; Shibata, Junko; Ikuhara, Yuichi; Kato, Kazumi; Kato, Takumi; Hirayama, Tsukasa

doi:10.1063/1.1499985

Cited by 36 publications

(33 citation statements)

References 28 publications

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“…On the other hand, the longer duration of the heat treatment (1) causes CuO nanocrystallites growth. The growth results in a decent of value [7]. The effect of the growth on value is also illustrated in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…Calcining process, however, has not thoroughly been studied yet. In our recent work, the decomposition of trifluoroacetates [7]. reaches a maximum at around 10 hours of the decomposition time during the heat treatment of 200 to 250 C. Origin of this peak formation is tentatively explained as effects of decomposed residue such as carbon content and CuO grain growth.…”

Section: Introductionmentioning

confidence: 93%

“…The latter effect has been investigated and is reported in detail [7]. Here we investigate the relationship between residual carbon content and of YBCO films with different calcining conditions.…”

Section: Introductionmentioning

confidence: 96%

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Calcining conditions for YBa/sub 2/Cu/sub 3/O/sub 7-x/ films by metalorganic deposition using trifluoroacetates

Niwa

Araki

Muroga

et al. 2003

IEEE Trans. Appl. Supercond.

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We investigated calcining conditions for YBa 2 Cu 3 O 7 (YBCO) films by metalorganic deposition using trifluoroacetates. We measured residual carbon content by secondary ion mass spectroscopy (SIMS) and critical current density values of the films calcined with various heat treatments. Precursor films are decomposed in calcining duration at 200 to 250 C, and simultaneously harmful residue such as carbon content is generated. SIMS results of carbon intensity show calcination is more effective than extension of the duration at 200 to 250 C to reduce carbon content.values of films with the calcination varied with the duration, reaching a maximum at about 10 hours. The values of the films depend on decomposition of trifluoroacetates and CuO nanocrystallites growth, rather than the influence of carbon content.We have succeeded in fabricating the YBCO films of 217 to 241 nm thickness with high values; 1.7 to 2.9 MA cm 2 (77 K, 0 T) on CeO 2 Gd 2 Zr 2 O 7 /hastelloy -C.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 93%

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Calcining conditions for YBa/sub 2/Cu/sub 3/O/sub 7-x/ films by metalorganic deposition using trifluoroacetates

Niwa

Araki

Muroga

et al. 2003

IEEE Trans. Appl. Supercond.

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“…The defects could behave as flux pinning sites, and thus Jc is enhanced. gradually [34,35]. Since the amorphous LAO area is smaller, the Ostwald ripening mechanism would make the top YBCO maintain its primitive growth characteristics, as shown in Figure 6f and the corresponding schematic diagram in Figure 8.…”

Section: Mechanism Of the J C Variationmentioning

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

Coatings

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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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“…The partial pressure of water, oxygen, the concentration of HF and temperature are main factors in the YBCO nucleation and growth. It has been suggested that reducing the fluorine content in the metal-organic precursors could help to lessen inhomogeneity in the resulting films [1,2] and the growth rate of the YBCO film is governed by Temperature, P H2O and P HF [3,4]. Takeshi Araki et al found that Y, Ba, and Cu trifluoroacetates decomposed to oxides or oxy-fluorides at 400°C in a humidified oxygen atmosphere, while Y and Ba trifluoroacetates which finally decompose to amorphous oxy-fluorides [5].…”

Section: Introductionmentioning

confidence: 99%

Phase transition during sintering process before nucleation of TFA-MOD YBa2Cu3O7-δ films

Dou

Liu

et al. 2015

2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

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In order to bring new insights to the transformation mechanism of intermediate phase and its dependence on processing conditions via trifluoroacetate metal organic deposition (TFA-MOD) method, a series of quenching experiments with different annealing temperature and atmospheres were designed. It was revealed that the transformation temperature of Ba-Y-F solid solution was lower with increasing the partial pressure of water. Calculation results of the Gibbs free energy change with different partial pressure of HF and H 2 O illustrated that the intermediate process is dominated by the exit diffusion of fluorine and the higher concentration of HF will inhibit the hydrolysis of barium fluoride.

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Growth model and the effect of CuO nanocrystallites on the properties of chemically derived epitaxial thin films of YBa2Cu3O7−x

Cited by 36 publications

References 28 publications

Calcining conditions for YBa/sub 2/Cu/sub 3/O/sub 7-x/ films by metalorganic deposition using trifluoroacetates

Calcining conditions for YBa/sub 2/Cu/sub 3/O/sub 7-x/ films by metalorganic deposition using trifluoroacetates

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

Phase transition during sintering process before nucleation of TFA-MOD YBa2Cu3O7-δ films

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