Study of substitution mechanism in the superconductor La2CuO4

Abstract EN

The aim of the research is to understand the mechanism of process of substitution of the ion Sr +2 instead of La+3 in the superconductor 2 4 La CuO.

Calculations of electrostatic potential (E.

P.) for two probable positions is done to determine the site of minimum energy, the site of La around Cu ion is the minimum in energy on all the range of concentrations of the Sr ion.

The changes in E.

P.

by substitution helps in understanding some aspects of the complex synthesis procedure of 2 4 La CuO compound and especially the high and the long period preparation temperature which gives full action of electrostatic forces.