Finite Element Method simulation study of heat propagation in a novel YBCO-based Coated Conductor for resistive fault current limiters

Djokić, Dejan M.; Antognazza, L.; Decroux, M.

doi:10.1016/j.ijthermalsci.2016.08.023

Cited by 1 publication

(3 citation statements)

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“…The 340 cm −1 phonon modes for the doped samples exhibit hardening below 700 K in Fig. 8(c) and (e) as a result of the weak chain disorder that may be due to the small concentrations of SiO 2 at the chain-Cu(1) site, which reduces the self-energy effect [6]. The change in this mode presents that it is directly relevant to the vibrations of the crystal lattice.…”

Section: Raman Scatteringmentioning

confidence: 90%

“…Because of the large number of phonons in the oxides, it is easy to obtain modes at the right frequencies and wave vectors for achieving energy conservation [20]. The results of fitting (6) to the experimental high-temperature Raman data and the anharmonic coefficients A 2 and A 3 obtained are shown in Tab. IV and Fig.…”

Section: Raman Scatteringmentioning

confidence: 99%

“…O (4) positioned between Cu(1) and Cu (2) atoms are called the apex-o or bridge-site oxygen. Djokić et al [6] have computed the configuration of YBCO-based coated conductors for applications in resistive superconducting fault current limiters. The simulation results have demonstrated an enhancement in the normal zone propagation velocity.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of temperature dependence of Raman and photoluminescence analysis of YBa2Cu3O7 (YBCO) doped with SiO2 nanoparticles

Almessiere

2018

SCI SINTER

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We report the effect of SiO 2 nanoparticles (12 nm) in YBa 2 Cu 3 O 7 (YBCO) matrix. The samples YBCO and SiO 2 +YBCO are fabricated by a conventional solid-state reaction method, in ambiance conditions. We analyze these samples using X-ray diffraction (XRD), resonant Raman, environmental scanning electron microscopy (ESEM), and Photoluminescence (PL) as a function of temperature in the range from 77 to 837 K. The XRD confirm that the doped YBCO still displays a perovskite structure with the orthorhombic Pmmm phase. The Rietveld refinement confirms that SiO 2 nanoparticles induce not only a strong effect on the oxygen's O(5) and O(8) positions but also an elongation of the unit cell along the c-axis. The PL intensity of pure YBCO is more intense than the doped one that is mainly composed of two bands located at 2.4 eV and 1.88 eV. We simulate the PL intensity with temperature using the Bose-Einstein model with two activation energies corresponding to some specific vibration mode energies. The simulation reveals that the exchange energy between different levels in pure and doped YBCO is conducted by only two vibrations modes that are strongly linked to the oxygen and copper atoms in the YBCO matrix. We determine the evolution of Raman mode frequencies at 340 and 500 cm −1 with temperature using the Lorentzian function at q = 0 of the Balkanski model.

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Section: Raman Scatteringmentioning

confidence: 90%

Section: Raman Scatteringmentioning

confidence: 99%