H C Verma
Articles written in Pramana – Journal of Physics
Volume 21 Issue 6 December 1983 pp 357-367 Solid State Physics
A new method to calculate the lattice contribution to electric field gradients at a nuclear site in tetragonal crystals is developed. The crystal is regarded as an assembly of positive ions at lattice points embedded in a uniform background of negative charge (point charge model). The method uses Euler-Maclaurin formula and makes the plane-wise summation in the direct crystal space unlike most of the previous methods utilising Fourier transform to reciprocal space. The numerical values obtained using the above approach agree well with previous results.
Volume 22 Issue 1 January 1984 pp 57-61 Solid State Physics
Mössbauer studies of metallurgically prepared FeZn alloy reveal that it undergoes an irreversible phase change on heating. The new phase starts precipitating at temperatures below 403 K and causes an apparent decrease in quadrupole splitting. The results are analysed in the framework of charge shift model and it is suggested that the vibrations of iron ion in zinc are likely to be much less anisotropic than those of zinc ions in pure zinc.
Volume 23 Issue 1 July 1984 pp 39-46 Solid State Physics
The charge shift model has been used to calculate electric field gradients (
Volume 25 Issue 2 August 1985 pp 211-215 Solid State Physics
Electric field gradient (
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