New MOD solution for the preparation of high Jc REBCO superconducting films

Kim, Byeong‐Joo; Lim, Sun-Weon; Kim, Ho-Jin; Hong, Gye-Won; Lee, Hee-Gyoun

doi:10.1016/j.physc.2006.04.085

Cited by 11 publications

(8 citation statements)

References 9 publications

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“…Probably, the most wellknown and studied REBCO compound is YBa 2 Cu 3 O 7- (YBCO). However, in recent years it has been studied the replacement of Y 3+ in YBa 2 Cu 3 O 7 by other RE ions (e.g., Nd 3+ , Sm 3+ , Eu 3+ or Gd 3+ ) to form alternative REBCO compounds because some of these compounds can display enhanced superconducting performances [7][8][9] . The differences in the physical properties are linked mainly to variations in structure related to modified ionic radius of the RE ions [10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Epitaxial superconducting GdBa₂Cu₃O_7−δ/Gd₂O₃ nanocomposite thin films from advanced low-fluorine solutions

Cayado

Mundet

Eloussifi

et al. 2017

Supercond. Sci. Technol.

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We have employed the CSD method to synthesize GdBCO and GdBCO-Gd 2 O 3 nanocomposite 250-300 nm thin films. For this we have designed a new Low-Fluorine (LF) solution never used before in the synthesis of GdBCO thin films that allow to reduce the HF release by 80% and increasing the reproducibility of the pyrolysis process. The growth of these thin films required the design of a new thermal process what we called "Flash-Heating" in which the heating rate is extremely fast (~600 ºC/min). The structure and the superconducting properties of the pristine GdBCO films are excellent showing a (00l) epitaxial orientation of the GdBCO grains and T c values that reach 92.8 K which means and enhancement of more than 1 K with respect to the standard YBCO films. The calculated J c inside the grains ( ) present also remarkable values: (5 K) ~ 40 MA/cm 2 and (77 K) ~ 3.3 MA/cm 2 . Finally, the GdBCO-Gd 2 O 3 nanocomposites films, with a 20% mol of Gd 2 O 3 , exhibit superior superconducting properties and pinning performances with respect to the GdBCO pristine films.

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Section: Introductionmentioning

confidence: 99%

Epitaxial superconducting GdBa₂Cu₃O_7−δ/Gd₂O₃ nanocomposite thin films from advanced low-fluorine solutions

Cayado

Mundet

Eloussifi

et al. 2017

Supercond. Sci. Technol.

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“…According to recent studies, (GdBCO) has higher than YBCO, resulting in higher in thin films at 77 K [1]- [3]. Also, for GdBCO thin films and coated conductors (CC) a higher critical current density, , is reported in high magnetic fields at 77 K [1], [2], [4]- [6]. The angular dependence of was more isotropic for GdBCO than for YBCO and the volume of -oriented grains does not grow as much as in YBCO as film thickness increases [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Schlesier

Huhtinen

Paturi

et al. 2009

IEEE Trans. Appl. Supercond.

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We report the effect of 4 wt% BZO-doping in GdBCO thin films on (100) STO substrates with novel nanograined target materials deposited by pulsed laser deposition (PLD) method. X-ray diffraction, atomic force microscopy and magnetization measurements, which were made in particularly wide temperature and magnetic field range, were used to determine the structural and superconducting properties. The results were compared with ones of YBCO. The deposition temperature, s , is not very critical for GdBCO and it is found to be much lower in undoped and BZO-doped GdBCO than in YBCO. The BZO-doping of GdBCO enhanced the field dependence of critical current density, c , at low temperatures. Furthermore, BZO-doping enhances the accommodation field, , below 60 K being clearly higher at 10 K in doped GdBCO than in YBCO. The pinning mechanism in GdBCO was concluded to be similar to that of YBCO. Our results clearly show that undoped and BZO-doped nanophase GdBCO is a very promising target material for applications as well as for coated conductors.

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“…The metalorganic precursor of the DCA-MOD was prepared by dissolving Y-, Ba-and Cu-acetates in dichloroacetic acid with a cation ratio of Y:Ba:Cu = 1:2:3 [7]. Blue gel was obtained by evaporating water and acetic acid in the solution using a rotavapour.…”

Section: Methodsmentioning

confidence: 99%

“…These are encouraging results for the scientists who pursue new MOD precursors for the fabrication of high-quality HTS films. More recently, Kim et al [7] also succeeded in preparing high-quality YBCO film using dichloroacetic (DCA) acid as a solvent for the preparation of the coating solution. Among these processes, the DCA-MOD process is a very recent one and it is desirable to optimize the processing parameters in order to obtain higher J c over 1 MA cm −2 .…”

Section: Introductionmentioning

confidence: 99%

Optimization of processing parameters of YBCO films prepared by a dichloroacetic-metalorganic deposition method

Kim¹,

Yi²,

Kim³

et al. 2007

Supercond. Sci. Technol.

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The fluorine-free dichloroacetic-metalorganic deposition (DCA-MOD) method has been optimized and high-Jc YBa2Cu3Ox (YBCO) superconducting films over 1 MA cm−2 have been obtained. The effects of using a dilution solvent for the preparation of coating solutions were investigated for methanol and 2-methoxyethanol, respectively. The uniformity of the film thickness was improved by the use of 2-methoxyethanol. The two-step heat treatment for the preparation of the YBCO film led to a significant densification of the microstructure. Coated films were calcined at lower temperatures of up to 500 °C in a flowing oxygen atmosphere with a humidity of 7.2%. Conversion heat treatment was performed at various temperatures of 780–810 °C for 2 h in flowing Ar gas containing 1000 ppm oxygen with a humidity of 9.45%. SEM observations showed that the films have very dense microstructures with little pores. X-ray diffraction analysis showed that YBCO grains grew with a (00l) preferred orientation. A high critical current density (Jc) of 1.28 MA cm−2 (at 77 K and self-field) was obtained for the YBCO film prepared by the two-step heat treatment.

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New MOD solution for the preparation of high Jc REBCO superconducting films

Cited by 11 publications

References 9 publications

Epitaxial superconducting GdBa₂Cu₃O_7−δ/Gd₂O₃ nanocomposite thin films from advanced low-fluorine solutions

Epitaxial superconducting GdBa₂Cu₃O_7−δ/Gd₂O₃ nanocomposite thin films from advanced low-fluorine solutions

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Optimization of processing parameters of YBCO films prepared by a dichloroacetic-metalorganic deposition method

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New MOD solution for the preparation of high Jc REBCO superconducting films

Cited by 11 publications

References 9 publications

Epitaxial superconducting GdBa2Cu3O7−δ /Gd2O3 nanocomposite thin films from advanced low-fluorine solutions

Epitaxial superconducting GdBa2Cu3O7−δ /Gd2O3 nanocomposite thin films from advanced low-fluorine solutions

Structural and Superconducting Properties of Undoped and BZO-doped GdBCO Thin Films

Optimization of processing parameters of YBCO films prepared by a dichloroacetic-metalorganic deposition method

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Epitaxial superconducting GdBa₂Cu₃O_7−δ/Gd₂O₃ nanocomposite thin films from advanced low-fluorine solutions

Epitaxial superconducting GdBa₂Cu₃O_7−δ/Gd₂O₃ nanocomposite thin films from advanced low-fluorine solutions