Effects of Nickel substitution on crystalline structure and superconducting properties of YBa2Cu3O7- ceramics.
Journal Title: Journal of New technology and Materials - Year 2017, Vol 7, Issue 2
Abstract
In this study, nickel-substituted Y〖Ba〗_2 (〖Cu〗_(1-x) 〖Ni〗_x )_3 O_(7-δ) ( 0 ≤x ≤4 at.%) superconductor samples were prepared by the conventional solid state reaction method. The effects of Ni substitution on the structure, microstructure, superconducting properties and Raman modes of Y〖Ba〗_2 (〖Cu〗_(1-x) 〖Ni〗_x )_3 O_(7-δ)systemshavebeeninvestigated. The Ni-substituted induces a porous, finer grained structure. The energy dispersive X-ray spectroscopy (EDS) analysis confirmed the incorporation of nickel into the grains. RamanspectroscopyshowsthattheNidopingenhancesthedisorderatthe〖CuO〗_2planes and decreases the oxygen content by the depletion from the CuO chains. The temperature dependent resistivity measurementsρ(T) show a deviation from linearity, due to the opening of a pseudogap. DC susceptibility measurements show that the transition temperature decreases with increasing Ni content.
Authors and Affiliations
Souheila Chamekh, Abderrahmane Bouabellou, Yalçin Elerman, Melike Kaya, Ilker Dincer
Keywords
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