Characterization of the CoFe2O4/Cu displacement effect in the Y123 superconductor matrix on critical properties
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Characterization of the CoFe2O4/Cu displacement effect in the Y123 superconductor matrix on critical properties S. Safran1,*
, F. Bulut2, A. R. A. Nefrow3, H. Ada4, and O. Ozturk3
1
Department of Physics, Ankara University, 06100 Ankara, Turkey Sinop University, Scientific and Technological Research Applications and Research Center, 57000 Sinop, Turkey 3 Department of Electrical and Electronics Engineering, Kastamonu University, 37100 Kastamonu, Turkey 4 Department of Mechanical Engineering, Kastamonu University, 37100 Kastamonu, Turkey 2
Received: 6 July 2020
ABSTRACT
Accepted: 30 September 2020
In this study, CoFe2O4 (x = 0, 5, 10 and 20 wt%) doped YBa2Cu3-x(CoFe2O4)xO7-d bulk samples were produced using solid state reaction (SSR) method and sol–gel(SG) methods. Oxide-form and acetate-form powders were preferred for SSR method and SG method, respectively. The heat treatment of the produced samples was carried out in two stages. Firstly, the samples were annealed at 950 °C for 24 h, after which they were kept in oxygen at 500 °C for 5 h and allowed to be cooled down to room temperature. Characterization of all samples was performed using methods such as X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, temperature-dependent resistance measurement (R–T) and Vickers microhardness analysis. Superconducting behavior was observed in all the produced samples, but as a result of the addition, a decrease was observed with the increase of the doping ratio at the critical transition temperature. As a result of the characterization, it is concluded that the doping ions can be replaced with Cu atoms in Y123 structure. In addition, doping led to significant changes in Vickers microhardness results.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction One of the most important advantages of YBa2Cu3O7d (Y123) superconductor structure is that it has a transition temperature above the liquid nitrogen temperature as in other high temperature superconductors (HTS). In this way, superconductors can be used in many technological areas related to motors,
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https://doi.org/10.1007/s10854-020-04578-y
transformers, material engineering, heavy industry technology and industrial energy etc. To use superconductors in technological applications, structural, electrical, magnetic and mechanical performance of materials are very crucial. In this context, different studies have been conducted to examine and improve the production methods and properties of YBCO, which has one of the copper-layer
J Mater Sci: Mater Electron
superconductors [1–5]. Different methods of production [6–9], displacement [10, 11] or adding to the structure at certain stoichiometric rate [12, 13] were applied and the properties of the samples produced were investigated. The SSR method is one of the most common methods in the production of polycrystalline YBCO superconductors. This method involves mixing of the powdered chemicals in stoichiomet
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