Electric Feild Gradient Calculations In Dilute Alloys Copper

A re-view of the Electric Field Gradient (EFG) tensor has been carried out. The theoretical models proposed by Kohn and vosko (1960) SI and in and Friedel (1960), Sagalyn, Pashkin and Harrison (1961), Sagalyn and Alexander (1977) and Ponnambalam and Jena (1931) have been reviewed- The Ponnambaiam and Jena theory (1991) was used to calculate the EPG tensor tor fourth and fifth row impurities in copper. Results of first nearest neighbour (1nn) and second nearest neighbour (2nn) calculations show good agreement with experimental values. For fifth row impurities using the value of row=25.6 and gamma=1.0; the mean percentage deviation between calculated values and experimental values was 4,S per cent for Inn For 2nn, using the value of row=34.0, gamma=7.5, a mean percentage deviation or 12.5 per cent was obtained. Where row and gamma are the Bloch enhancement factor and strain coupling parameter respectively. The3 results show that the Ponnambalam—Jena theory account for the EFG results better than the previous theories.

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