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Abstract
The effects of Na substitution on the properties of Bi2Sr2Ca1Cu2−xNaxOy were investigated. The prepared samples are characterized using X-ray powder diffraction, scanning electron microscope, DC electrical resistivity and magnetic-hysteresis loop measurements. It has been found that with increasing Na doping for Cu, the transition temperature gradually increase while crystal lattice parameters slightly change. Magnetic hysteresis measurements have shown that the hysteresis loops of doped samples are greater than the undoped sample. In addition, significant enhancement has been observed in the Jc values of Na-doped samples, which were calculated from the M–H curves by using Bean’s critical state model.
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