Melting temperature of YBa2Cu3O7−x and GdBa2Cu3O7−x at subatmospheric partial pressure

Tair, F.; Carreras, Laura; Camps, Jaume; Farjas, Jordi; Roura, P.; Calleja, A.; Puig, T.; Obradors, X.

doi:10.1016/j.jallcom.2016.08.072

Cited by 16 publications

(13 citation statements)

References 25 publications

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“…2. The heating rate as well as the shape and the size of the sample in each case were kept constant, since they have been observed to have an important effect on mass loss and the shape of the DSC peak 23 . Based on the results, during the endothermic melting process where oxygen evaporates from the YBCO, the mass loss in n-YBCO seems to be almost doubled, ≈ 2%, indicating an excess of encapsulated oxygen or a faster release of lattice oxygen through the grain boundaries, pores etc.…”

mentioning

confidence: 99%

Control of the nanosized defect network in superconducting thin films by target grain size

Aye

Rivasto

Khan

et al. 2021

Sci Rep

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A nanograined YBCO target, where a great number of grain boundaries, pores etc. exist, is shown to hold an alternative approach to future pulsed laser deposition based high-temperature superconductor thin film and coated conductor technologies. Although the nanograined material is introduced earlier, in this work, we comprehensively demonstrate the modified ablation process, together with unconventional nucleation and growth mechanisms that produces dramatically enhanced flux pinning properties. The results can be generalized to other complex magnetic oxides, where an increased number of defects are needed for modifying their magnetic and electrical properties, thus improving their usability in the future technological challenges.

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confidence: 99%

Control of the nanosized defect network in superconducting thin films by target grain size

Aye

Rivasto

Khan

et al. 2021

Sci Rep

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“…Thermal stability of cuprate superconductor ceramic compounds, RE1Ba2Cu3O7- (REBCO) (RE means "rare earth"), is limited by sintering temperature Ts and incongruent melting at Tm [1]. Knowledge of Ts and Tm is crucial for growing bulk superconductors from the melt.…”

Section: Introductionmentioning

confidence: 99%

DTA-TG Analysis of Gd0.95La0.05Ba1.95Sr0.05Cu3Oy Compounds

Sumadiyasa¹,

Suardana²,

Wendri³

2020

BULETIN FISIKA

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Abstrak -The sintering temperature is played a vital role in the evolution of phase structure, microstructure, and the properties of the superconductor. In this study, the Gd0.9La0.1Ba1.95Sr0.05Cu3O7- phase compound has been synthesized by the wet method using HNO3 as a solvent. The samples were divided into two groups. The first sample was calcined at 400 °C for 2 hours + 500 °C for 2 hours + 600 °C for 6 hours. The second sample treated by the same process and then continued by heating at 900 °C for 15 minutes. The effect of the calcination temperature for the synthesis of Gd0.9La0.1Ba1.95Sr0.05Cu3O7- bulks was investigated using the DTA-TG method. The results showed that the optimum reaction temperature for the formation of Gd0.9La0.1Ba1.95Sr0.05Cu3O7- phase was 938 °C. The additional heating temperature e.g. 900 °C for 15 minutes on the calcination process can reduce the optimum formation temperature of by 20 °C. The peritectic melting reaction temperatures of the sample without the addition of heating and with the addition of heating at temperature 900 °C for 15 minutes are 1032°C and 1035°C, respectively. The melting temperatures of both samples are 1164 °C and 1200 °C.

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“…Based on such YBCO conversion mechanism, the growth rate of YBCO could be as fast as 100 nm/s, which offers a possibility of high production rate for industrialization . However, such enhanced transition liquid phase also has some drawbacks, that is, strong corrosivity and high reactivity …”

Section: Introductionmentioning

confidence: 99%

“…11 However, such enhanced transition liquid phase also has some drawbacks, that is, strong corrosivity and high reactivity. 12 Chemical stability/compatibility of the cap layer in the technical substrates plays an essential role on YBCO formation, that is, the YBCO and cap-layer interface reaction is a crucial issue that must be taken into consideration during YBCO nucleation and growth. For example, in the case of CeO 2 as cap-layer material, the formation of BaCeO 3 at the interface has been reported for using either chemical solution deposition (TFA-MOD [13][14][15] and FF-MOD 6,16,17 ) or vacuum deposition methods.…”

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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Melting temperature of YBa2Cu3O7−x and GdBa2Cu3O7−x at subatmospheric partial pressure

Cited by 16 publications

References 25 publications

Control of the nanosized defect network in superconducting thin films by target grain size

Control of the nanosized defect network in superconducting thin films by target grain size

DTA-TG Analysis of Gd0.95La0.05Ba1.95Sr0.05Cu3Oy Compounds

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

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Melting temperature of YBa2Cu3O7−x and GdBa2Cu3O7−x at subatmospheric partial pressure

Cited by 16 publications

References 25 publications

Control of the nanosized defect network in superconducting thin films by target grain size

Control of the nanosized defect network in superconducting thin films by target grain size

DTA-TG Analysis of Gd0.95La0.05Ba1.95Sr0.05Cu3Oy Compounds

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

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