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Experimental and Theoretical NANOTECHNOLOGY

About the Journal :

Experimental and Theoretical NANOTECHNOLOGY (ETN) is a multidisciplinary peer-reviewed international journal published four issues a year. It includes specialized research papers, short communications, reviews and selected conference papers in special issues on the characterization, synthesis, processing, structure and properties of different principles and applications of NANOTECHNOLOGY; with focus on advantageous achievements and applications for the specialists in engineering, chemistry, physics and materials science.

ETN covers and publishes all aspects of fundamental and applied researches of experimental and theoretical nanoscale technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology within the scope of the journal. ETN aims to acquire the recent and outstanding researches for the benefit of the human being.



THE EFFECT OF ADDITIVES ON BEHAVIOR OF THE HIGH TEMPERATURE LAXY1-XBA2CU3O7-δ SUPERCONDUCTOR

The effect of additives on behavior of the high temperature LaxY1-xBa2Cu3O7-δ superconductor

Abstract

A series of ceramic superconductor compounds with the composition LaxY1-x Ba2Cu3O7-δ are prepared by solid state reaction from the principle routs like La2O3, BaCO3 and CuO with high purity 99.99%. Different measurement are made to show the improvement in high phase superconductor such as resistivity measurement and the X-ray diffraction (XRD). When (x=0.20

and 0.80; x=0.40 and 0.60) an orthorhombic phase is appeared with lattice constants (a= 3.844 Å, b=3.912 Å, c=11.839 Å) and (a= 3.871 Å, b=3.881 Å, c=11.748Å), respectively. This emphasizes the formation of a high temperature superconducting phase. At x=0.5 a phase is changed to a tetragonal where the superconductivity is lost. From the resistivity measurement, the highest (Tc) value is found equals to (97K) for (x=0.20 and x=0.80) comparable with the YBCO-compound which does not normally exhibited Tc-value greater than (95K). The increase in Tc-value may be attributed to the amount of (La) and / or the oxygen content in the mixture which both influence the properties of the compound and are essential for the superconductivity phase.