ELECTRIC FEILD GRADIENT CALCULATIONS IN DILUTE ALLOYS COPPER
ELECTRIC FEILD GRADIENT CALCULATIONS IN DILUTE ALLOYS COPPER
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Date
1990-11
Authors
USMAN, YAHAYA—JOE
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Abstract
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.
Description
A Thesis submitted to the Post gradual e School
Ahmadu B e i l o u n i v e r s i t y , Z a r i a , in p a r t i al
f u l f i l m e n t of the requirements for the
Award of the Degree of Master of Science
in Physics.
Department of Physics
Faculty of science
Ahmadu B e l l o U n i v e r s i t y
Z a r i a , Nigeria
Keywords
ELECTRIC FEILD GRADIENT,, DILUTE ALLOYS COPPER,