Formation of thin-film high <i>T</i>
                  <i>c</i> superconductors by metalorganic deposition

Hamdi, Adel; Mantese, J. V.; Micheli, Adolph L.; Laugal, R.C.O.; Dungan, D. F.; Zhang, Z. H.; Padmanabhan, K. R.

doi:10.1063/1.98978

Cited by 84 publications

(8 citation statements)

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“…This ex-situ technique has the advantages of precise composition control and formation of films with any shape and size without the requirement of high vacuum apparatus. This method was first applied by Hamdi et al [1] and Mantese et al [2], to produce YBCO thin films on SrTiO 3 substrate where a chemical solution of Y, Ba, and Cu neodecanoates was used. Thin YBCO films were also prepared on SrTiO 3 and MgO substrates from the metal (Y, Ba, Cu) acetylacetonates dissolved in methanol and the effects of annealing temperature and oxygen partial pressure on the crystallization of YBCO was studied by Manabe et al [3,4] using X-ray diffraction and scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

Characterization of YbBa2Cu3O7—y Superconducting Thin Films Prepared by Chemical Solution Deposition on SrTiO3 (001) and LaAlO3 (001) Substrates

L.¹,

Shibata

Hirayama

et al. 1999

phys. stat. sol. (a)

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c‐axis oriented films of YbBa2Cu3O7—y have been prepared by postdeposition annealing of metal (Yb, Ba, Cu) naphthenate gels spin‐coated on SrTiO3 (001) and LaAlO3 (001) substrates in the temperature range from 650 to 900 °C under oxygen partial pressures from about 105 to 10 Pa. High resolution electron microscopy studies showed that the thickness of the as‐prepared c‐axis YbBCO films was in the range from 80 to 100 nm after postdeposition annealing at 725 °C for the film on SrTiO3 and at 750 °C for the film on LaAlO3; above this thickness, a small amount of Yb2O3, CuO, and random‐oriented Yb123 phases were observed. The c‐axis film obtained on the SrTiO3 (001) substrate is defective with stacking faults to form a defect microstructure rather than forming the well‐ordered YbBa2Cu4O8 (Yb124) phase. The film obtained on the LaAlO3 (001) substrate, in contrast to that on SrTiO3, involves a small amount of a‐axis Yb123 grains with dimensions of 5 to 30 nm. The Tc,zero value is 89 K for the film derived on SrTiO3 and 85.5 K for the film on LaAlO3.

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Section: Introductionmentioning

confidence: 99%

Characterization of YbBa2Cu3O7—y Superconducting Thin Films Prepared by Chemical Solution Deposition on SrTiO3 (001) and LaAlO3 (001) Substrates

L.¹,

Shibata

Hirayama

et al. 1999

phys. stat. sol. (a)

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“…[4][5][6] Non-vacuum techniques, overall classified as Chemical Solution Deposition (CSD) routes, are preferred over vacuum techniques because they show favorable features including (i) lower investments, (ii) faster deposition rates with higher yields, and most importantly (iii) processing under ambient pressure enabling a continuous process. 7 Among the different precursor designs described for the synthesis of YBCO coated conductors using CSD, [8][9][10][11][12][13][14][15][16] metalorganic deposition using trifluoroacatetes (TFA) is the most widespread. This originates from the fact that TFA solutions decompose to carbonate-free precursor films while in fluorine-free CSD processes, the organic precursors lead to the formation of BaCO 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Among the different precursor designs described for the synthesis of YBCO coated conductors using CSD, − metalorganic deposition using trifluoroacatetes (TFA) is the most widespread. This originates from the fact that TFA solutions decompose to carbonate-free precursor films while in fluorine-free CSD processes, the organic precursors lead to the formation of BaCO 3 .…”

Section: Introductionmentioning

confidence: 99%

Elucidation of the Mechanism in Fluorine-Free Prepared YBa₂Cu₃O_7−δ Coatings

et al. 2010

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In this work, the reaction mechanism used in the preparation of fluorine-free superconducting YBa(2)Cu(3)O(7-delta) (YBCO) was investigated. To determine which precursor interactions are dominant, a comprehensive thermal analysis (thermogravimetric analysis-differential thermal analysis) study was performed. The results suggest that a three step reaction mechanism, with a predominant role for BaCO(3), is responsible for the conversion of the initial state to the superconducting phase. In the presence of CuO, the decarboxylation of BaCO(3) is kinetically favored with the formation of BaCuO(2) as a result. BaCuO(2) reacts with the remaining CuO to form a liquid which ultimately reacts with Y(2)O(3) in a last step to form YBCO. High temperature X-ray diffraction experiments confirm that these results are applicable for thin film synthesis prepared from an aqueous fluorine-free sol-gel precursor.

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“…S oon after the discovery of the cuprate high temperature superconductor (HTS), chemical solution depositions (CSD) were developed to grow YBa 2 Cu 3 O 7− δ (YBCO) films 1–5 . Now three major CSD approaches are in use for the ReBCO (Re, rear earth) deposition 6–9 : (1) sol–gel processes that use 2‐methoxyethanol as reactant/solvent, (2) hybrid processes that use chelating agents such as acetylacetonates or diethanolamine to reduce alkoxide reactivity, and (3) metal organic decomposition (MOD) techniques that use high‐molecular weight precursors and water‐insensitive carboxylates, for example 2‐ethyl‐hexanoates, etc.…”

Section: Introductionmentioning

confidence: 99%

Processing Dependence of Texture, and Critical Properties of YBa₂Cu₃O_7−δ Films on RABiTS Substrates by a Non‐Fluorine MOD Method

Goyal

Leonard

et al. 2006

Journal of the American Ceramic Society

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YBa 2 Cu 3 O 7Àd (YBCO or Y123) films on rolling-assisted biaxially textured substrates (RABiTS) were prepared via a fluorinefree metallorganic deposition (MOD) through spin coating, burnout, and high temperature anneal. The effects of substrate texture and surface energy of the CeO 2 cap layer were investigated. Except for the commonly accepted key factors, such as the textures of substrate and buffer layers, we found some other factors, for example, the deposition temperature of the cap layer, are also critical to the epitaxial growth of Y123 phase. With the CeO 2 cap layer deposited at relative high temperature of 7001C, a critical current density, J c , over 1 MA/cm 2 has been demonstrated for the first time on Ni-RABiTS by a fluorine-free MOD method. Whereas for samples with CeO 2 cap layers deposited at a lower temperature of 6001C, even though XRD data showed a better texture on these buffer layers, texture degradations of YBCO grains under the optimized processing conditions were observed and a lower oxygen partial pressure around 40 ppm was necessary for the epitaxial growth of Y123 phase. As a result, J c fell to 0.45 MA/cm 2 at 77 K. The observed phenomena points to the change of surface energy and reactivity of the CeO 2 cap layer with respect to the CeO 2 deposition temperature. In this paper, the YBCO phase diagram was also summarized. J ournalJ. Am. Ceram. Soc., 89 [3] 914-920 (2006)

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Formation of thin-film high T c superconductors by metalorganic deposition

Abstract: Articles you may be interested inThinfilm junctions of cadmium telluride by metalorganic chemical vapor deposition

Cited by 84 publications

References 9 publications

Characterization of YbBa2Cu3O7—y Superconducting Thin Films Prepared by Chemical Solution Deposition on SrTiO3 (001) and LaAlO3 (001) Substrates

Characterization of YbBa2Cu3O7—y Superconducting Thin Films Prepared by Chemical Solution Deposition on SrTiO3 (001) and LaAlO3 (001) Substrates

Elucidation of the Mechanism in Fluorine-Free Prepared YBa₂Cu₃O_7−δ Coatings

Processing Dependence of Texture, and Critical Properties of YBa₂Cu₃O_7−δ Films on RABiTS Substrates by a Non‐Fluorine MOD Method

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Formation of thin-film high T c superconductors by metalorganic deposition

Abstract: Articles you may be interested inThinfilm junctions of cadmium telluride by metalorganic chemical vapor deposition

Cited by 84 publications

References 9 publications

Characterization of YbBa2Cu3O7—y Superconducting Thin Films Prepared by Chemical Solution Deposition on SrTiO3 (001) and LaAlO3 (001) Substrates

Characterization of YbBa2Cu3O7—y Superconducting Thin Films Prepared by Chemical Solution Deposition on SrTiO3 (001) and LaAlO3 (001) Substrates

Elucidation of the Mechanism in Fluorine-Free Prepared YBa2Cu3O7−δ Coatings

Processing Dependence of Texture, and Critical Properties of YBa2Cu3O7−δ Films on RABiTS Substrates by a Non‐Fluorine MOD Method

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Elucidation of the Mechanism in Fluorine-Free Prepared YBa₂Cu₃O_7−δ Coatings

Processing Dependence of Texture, and Critical Properties of YBa₂Cu₃O_7−δ Films on RABiTS Substrates by a Non‐Fluorine MOD Method