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Electric field gradient at nuclear site in the lattice of tetragonal close packed (TCP) metals such as Indium is computed using the theory developed on the pattern of the Charge Shift Model initiated for hexagonal close packed (hcp) lattice. Numerical results are obtained using FORTRAN programs developed by us for electric field gradient in Indium. A tabulation of lattice sums for electric gradient in this metal suggests that all the three nonequivalent sites under the charge shift ansatz do not simultaneously pass through null electric field gradient for the case when the tcp lattice of the element transforms to body centered cubic lattice with axial ratio unity. At least one non-equivalent electronic site in the frame work of the charge shift model lacks the point symmetry of tetragonal system and contributes an extra electric field gradient.

Keywords

Lattice Sum, TCP Lattice, Electric Field Gradient, Indium, Charge Shift, Body Centered Cubic Lattice

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