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The Effect of Ionic Substitution on the E.P. of Superconductor using Madelung Method | ||
| Journal of Education and Science | ||
| Article 8, Volume 22, Issue 1, 2009, Pages 78-92 PDF (0 K) | ||
| DOI: 10.33899/edusj.2009.57434 | ||
| Author | ||
| Bassam Mahmoud Mustafa* | ||
| Department of physics, College of Science, University of Mosul, Mosul, Iraq | ||
| Abstract | ||
| Abstract The effect of substitution of the ion instead of La+3 in the superconductor was studied, an increase in electrostatic potential energy E. P. (E) with increase of Sr % was noticed, and a step change in P. E. when Sr is added is noticed indicating a phase change occurrence in the crystal structure .Increase of Tc, with the increase of Sr, noticed earlier, is linked with increase of E.P. and a relation between E.P. and Tc is found , the increase of Tc is due the creation of holes by valance difference between La & Sr, which also leads to collapse of crystal by reduction of repulsion between Sr & Cu atoms this have the same effect as the application of pressure on the crystal, which increases Tc also. For x >0.15, Tc decreases due to the appearance of vacancies which may have screening effect of the electrostatic field. | ||
| Keywords | ||
| Ionic Substitution; electrostatic potential energy; Superconductor; Madelung Method | ||
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