Dramatic effects of chlorine addition on expanding synthesis conditions for fluorine-free metal–organic decomposition YBa2Cu3Oy films

Motoki, Takanori; Ikeda, Shuhei; Honda, Genki; Nagaishi, Tatsuoki; Nakamura, Shigenari; Shimoyama, Jun–ichi

doi:10.7567/apex.10.023102

Cited by 12 publications

(13 citation statements)

References 21 publications

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“…For further improvement, we moved on to the replacement of the reactively sputterdeposited NbN thin film by Y123 deposited by the metal-organic deposition (MOD) method [25][26][27]. Because metal-organic precursors dissolved in a carrier fluid such as propionic acid can easily go into the trench, this is advantageous in comparison with sputter deposition with a limited throwing power.…”

Section: Replacement Of Nbn By Yba 2 Cu 3 O 7-δ To Increase Electricity Storage Volume Densitymentioning

confidence: 99%

“…Y123 thin films sometimes grow in mixed orientations of the c-axis and aaxis [25,27]. Even if c-axis-oriented Y123 is successfully grown on buffered Si substrate [26], the c-axis of the Y123 thin film grown on the bottom of the trench and the c-axis of the Y123 thin film grown on the trench wall cannot be in parallel with the same magnetic flux simultaneously. Therefore, there remains many challenges in material science and engineering to attain depositions of high-quality Y123 thin films with a sufficient magnetic flux density dependence of j c in the trench.…”

Section: Possibility Of Smes To Rank With or Surpass Capacitors In Electricity Storage Volume Densitymentioning

confidence: 99%

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Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

et al. 2021

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A compact superconducting magnetic energy storage system (SMES) produced by Si micro fabrication technologies has been proposed to improve electricity storage volume density, w, in the sub-Wh/L range of conventional SMESs and to produce them at a low cost by mass production. In parallel with the experimental development reported previously, a series of trials was performed to estimate a feasible value of w based on the calculation of the magnetic field generated by the compact SMES by improving the calculation models step by step. In this work, the experimentally obtained magnetic flux density dependence of superconductive critical current density was taken into consideration for the first time in this series of trials, together with the additional improvement of the calculation models. The results of the estimation indicated that a compact SMES produced by the proposed concept can attain a w in the Wh/L range or more, ranking with or surpassing that of presently used capacitors.

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Section: Replacement Of Nbn By Yba 2 Cu 3 O 7-δ To Increase Electricity Storage Volume Densitymentioning

confidence: 99%

Section: Possibility Of Smes To Rank With or Surpass Capacitors In Electricity Storage Volume Densitymentioning

confidence: 99%

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

et al. 2021

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“…It is known that superconducting phase stability is increased when replacing oxygen with chlorine [12]. Recently, Takanori Motoki et al reported [13][14][15] the preparation of halogen (Cl, Br) added YBCO thin films on single crystal SrTiO 3 by the fluorine-free MOD method led to the internal epitaxial growth of small nanocrystals Ba 2 Cu 3 O 4 Cl 2 , which effectively promoted the biaxial orientation of YBCO crystals. Further studies showed that halogen-added YBCO films not only improved the flux-pinning performance of the films, but also expanded the synthesis conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chlorine Addition on Texture and Superconducting Performance of YBa2Cu3O7−δ-Coated Conductors

Chen

et al. 2022

Crystals

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YBa2Cu3O7−δ (YBCO) thin films with the addition of Cl were prepared on Hastelloy tape by the extremely low fluorine metal-organic deposition (MOD) technique. The composition and microstructure of the present samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was revealed that the Cl-added YBCO thin films achieved better texture and density compared with the pure YBCO films. The superconducting properties at magnetic fields were measured using the magnetic property measurement system (MPMS). The results showed that the sample onset transition temperature (Tc, on) did not change significantly after the addition of Cl. The critical current density (Jc) in the presence of YBCO with the addition of Cl increased significantly. Meanwhile, both the Jc and gravitational force (Fp) of the (Cl, Hf) co-added YBCO films were further enhanced at different magnetic fields. The thermodynamic analysis of the BaCO3 removal reaction revealed that the addition of Cl to YBCO formed chlorine compounds, which were effective in avoiding the formation of BaCO3. Further, the calculation results of the Gibbs free energy at different pressure quotients showed that the stability of the relevant chlorine compounds occurred in the order of BaCl2 > CuCl2 > YCl3 and the oxidation of BaCl2 to BaO required a higher temperature compared to BaF2, implying the potential advantages of inhibiting the a-axis growth.

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“…In order to suppress BaCeO 3 formation, several approaches have been proposed. For instance, Motoki et al found that addition of chlorine in the precursor enables formation of YBCO under low sintering temperature so that undesirable reactions are minimized . From the perspective of reaction kinetics, the influences of sintering time on YBCO conversion were also studied .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Motoki et al found that addition of chlorine in the precursor enables formation of YBCO under low sintering temperature so that undesirable reactions are minimized. 20 From the perspective of reaction kinetics, the influences of sintering time on YBCO conversion were also studied. 17 It is suggested that BaCeO 3 is inevitable in the formation of YBCO, but shortening the sintering time is able to reduce its negative effect on the microstructure and performance of the films.…”

Section: Introductionmentioning

confidence: 99%

Interface reaction‐governed heteroepitaxial growth of YBa₂Cu₃O_7‐δ film on CeO₂‐buffered technical substrate

Chu

et al. 2019

J Am Ceram Soc

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Due to the high growth rate and environmental‐friendly, fluorine‐free metal‐organic decomposition routes (FF‐MOD) have attracted more attention for growth of high‐quality YBa2Cu3O7‐δ (YBCO) films. Few works have been performed when using technical substrates. In this study, correlation among the sintering process, microstructure, and superconductivity of the YBCO was systematically established on the technical substrates capped with CeO2 layer. We found that the optimal process conditions are mainly related to the enhanced transient liquid phase and BaCeO3. Combined X‐ray diffraction and scanning electron microscopy analyses indicate that high‐quality growth of YBCO film is a trade‐off of two different competition phenomena during sintering: (a) the presence of enhanced transient liquid phase, (b) the formation of BaCeO3 at the interface. The former is beneficial to YBCO epitaxial growth/structure rearrangement, while the latter should be suppressed in view of minimizing YBCO partial decomposition triggered by the interfacial reaction. Moreover, we confirmed that both two aforementioned phenomena are somehow associated with the cross‐linkage between the sintering temperature and pO2 during the YBCO conversion. According to this systemic study, the key parameters are defined to avoid the BaCeO3 formation prior to the YBCO orientation nucleation. Structure and superconductivity of the YBCO film were also investigated. Remarkably, a high Jc value of 3.69 mA/cm2 (77 K, sf) was obtained in the YBCO film grown on the CeO2 technical substrate deposited under optimized deposition conditions, which is rather comparable with that on the LaAlO3 single crystal. TEM cross‐sectional observation reveals that the enhanced Jc (B) properties of the YBCO film are mainly contributed by high density of short stacking faults. This work demonstrates the feasibility of FF‐MOD to fabricate high‐performance YBCO films on the CeO2‐buffered technical substrate.

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Dramatic effects of chlorine addition on expanding synthesis conditions for fluorine-free metal–organic decomposition YBa₂Cu₃O_y films

Cited by 12 publications

References 21 publications

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

Effect of Chlorine Addition on Texture and Superconducting Performance of YBa2Cu3O7−δ-Coated Conductors

Interface reaction‐governed heteroepitaxial growth of YBa₂Cu₃O_7‐δ film on CeO₂‐buffered technical substrate

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Dramatic effects of chlorine addition on expanding synthesis conditions for fluorine-free metal–organic decomposition YBa2Cu3Oy films

Cited by 12 publications

References 21 publications

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

Effect of Chlorine Addition on Texture and Superconducting Performance of YBa2Cu3O7−δ-Coated Conductors

Interface reaction‐governed heteroepitaxial growth of YBa2Cu3O7‐δ film on CeO2‐buffered technical substrate

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Dramatic effects of chlorine addition on expanding synthesis conditions for fluorine-free metal–organic decomposition YBa₂Cu₃O_y films

Interface reaction‐governed heteroepitaxial growth of YBa₂Cu₃O_7‐δ film on CeO₂‐buffered technical substrate