TITLE:
The Effects of Magnetic Dopant on the Structural and Electrical Properties in Superconducting YBaCu3O7-δ Ceramic
AUTHORS:
Souheila Chamekh, Abderrahmane Bouabellou
KEYWORDS:
YBCO Doped Co, Electrical Properties, Phase Transition, High Tc Superconductivity
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.8 No.1,
January
31,
2018
ABSTRACT: The work reported in this paper aims at a better understanding of the magnetic
doping effects on the structural and electrical properties for a series of
YBa2(Cu1-xCox)3O7-δ ceramics. The Co doped YBa2Cu3O7-δ are (YBCO) prepared
by conventional solid state reaction method and characterized by X-ray
diffraction (XRD) and scanning electron microscopy (SEM), differential
thermal analysis (DTA) and resistivity measurements. The crystal lattice parameters
are found to change due to the cobalt doping and tendency to a
structure phase transition from orthorhombic to tetragonal, which is confirmed
by the decrease of the degree of orthorhombicity. The morphology
examination with SEM revealed gradual increases of grain size with x = 0.02
Co, a high porosity is observed in the doped samples compared to the pure
one. The decomposition temperature of YBCO is pushed from temperatures
above 975°C to lower temperatures of 945°C. The resistivity measurements of
doped samples with x = 0.04 and 0.06; shows a deviation in from T-linear behavior
due to the opening of a pseudogap.