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Synthesis and characterization of YBaCu2O5-δ compound
, Article Physica C: Superconductivity and its Applications ; Volume 548 , 15 May , 2018 , Pages 112-115 ; 09214534 (ISSN) ; Sandoghchi, M ; Mokhtari, P ; Akhavan, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
YBaCu2O5 compound as one of the possible microstructures of Y3Ba5Cu8O19 has been synthesized. The X-ray diffraction analysis of this compound indicates that its formation is accompanied with the formation of YBa2Cu3O7-δ. The observed superconductivity around ∼92 K supports this. So, it seems that YBa2Cu3O7-δ is responsible for the observed superconductivity in YBaCu2O5, and this phase is not an independent superconducting phase. Consequently, the overall effect of the YBaCu2O5 formation during the Y3Ba5Cu8O19 fabrication process could be a reduction in Tc. © 2018 Elsevier B.V
Fast fourier transform based NDT approach for depth detection of hidden defects using HTS rf-SQUID
, Article IEEE Transactions on Applied Superconductivity ; Volume 28, Issue 7 , 2018 ; 10518223 (ISSN) ; Shanehsazzadeh, F ; Fardmanesh, M ; Sharif University of Technology
Abstract
We present a new approach for depth detection of hidden defects based on the analysis of the frequency spectrum of the output waveform in a nondestructive testing (NDT) system. In our eddy current Superconducting quantum interference device (SQUID) based NDT system, we apply multiple frequencies to its single excitation coil in a magnetically unshielded environment. The excitation coil is a planar D-shaped printed circuit board coil, and a high-Tc gradiometer YBCO rf-SQUID is used as the electromagnetic sensor in this system. An automated two-dimensional nonmagnetic scanning robot is used to test samples with intentional defects at different depths. In this approach, a diagram labeled 'FFT...