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    Demonstration of better superconducting performance in a solder with low lead content
    (IOP Publishing Ltd, 2022) Aksoy, Canan; Çakır, Bakiye; Koparan, Ezgi Taylan; Şimşek, Cemaleddin; Tıraşoğlu, Engin; Speller, Susannah
    Lead-free SnIn solders are promising for superconducting magnet applications. However, their superconducting properties are not as good as lead solders. In order to improve the superconducting performance of the Sn-In solders, researchers have investigated the superconducting properties of ternary systems such as Sn-In-Bi for solder joints. In this study, powders of Pb, Nb, AgCu and grapheme nano pellets in the ratios of 0.5-5 wt% have been added into SnIn (35:65) to investigate their microstructural, thermal and superconducting properties. The added materials enhance the superconducting properties. We find that even low Pb additions show a dramatic improvement in superconducting properties, with an increase in both T (c) and J (c) values of up to 6.35 K and 1.47 x 10(4) A m(-2), respectively. This shows that much lower Pb content superconducting solders can be effective and could be used to replace the PbBi solder commonly used with the superconducting properties T (c) =8.4 K, H (C2) = 1.77 T, H (C) = 0.0909 T.
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    Öğe
    Magnetic and levitation properties of YBCO/polymer composite drop-casting films
    (Elsevier B.V., 2025) Lucas, Beatriz; Brito, Miguel; Aksoy, Canan; Çakır, Bakiye; Coşkun, Elvan; Gencer, Ali; Pronto, Anabela; Ferreira, Isabel
    Superconducting materials have been extensively studied for various applications, with YBCO alloys among the most researched and widely applied. This paper investigates the feasibility of using YBCO powder-based inks to produce cost-effective films with magnetic properties. Our studies demonstrate that levitation in liquid nitrogen is consistently observed in all fabricated films, regardless of ink composition or application method. Both drop-casting and spray-coating techniques were successfully employed to create levitating films. Additionally, various substrates—including aluminum foil (with and without adhesive), plastic foil, Teflon, and paper—were evaluated, with no significant impact on levitation performance. The levitation height was also compared to samples without a substrate. Depending on the binder, the resulting films exhibit rigidity or flexibility while maintaining their levitation capabilities even after multiple bending cycles. However, film conductivity is influenced by the binder type and concentration, which also affects the critical current density. A film with a thickness of 300 μm demonstrated a Jc of 2 kA/cm² at 65 K and zero magnetic field.