Impurity effects on activation energy, structure and physical properties of Ybco superconductor

Authors : Murat ÖZABACI

Pages : 42-57

Doi:10.33769/aupse.766178

View : 10 | Download : 7

Publication Date : 2021-06-30

Article Type : Research Paper

Abstract :The influence of separately added 0.3 wt%, CdO, Bi 2 O 3 , BeO and SiO 2  on the phase formation, microstructure, magnetic and transport properties of Y 1 Ba 2 Cu 3 O insert ignore into journalissuearticles values(7-$\delta$);   insert ignore into journalissuearticles values(Y-123 or YBCO); fabricated by conventional solid state reaction method has been analyzed. The results reveal a very low solubility limit for bismuth and silicon in the Y-123 phase, leading to precipitation phases located within intergranular regions. BeO addition suppresses the granular nature of the structure by probably incorporating into the host matrix. CdO does not have a remarkable effect both on structural and superconducting properties of the Y-123 at this doping ratio. Attractive infield transition behavior was obtained in the Bi 2 O 3 added sample with a narrower transition width and an increase of transition temperatures approximately 1 K. The activation energy insert ignore into journalissuearticles values(U 0 );, a potential energy barrier to prevent flux flow, of the samples was estimated by taking into account Arrhenius law. The best U 0  value was computed to be 1.11 eV belonging to the Bi 2 O 3 added sample which implies the contribution of 3-5 µm sized Bi containing precipitation regions on the flux pinning capability of the Y-123.
Keywords : Y 1 Ba 2 Cu 3 O 7 delta, superconductor, doping, activation energy, flux pinning