Abstract
A short range force constant model has been used within the normal coordinate analysis framework for the first time to investigate the lattice dynamics of Sr 2B′UO 6 (B′=Ni, Co) double perovskites having space group P2 1/n. The zone centre phonons have been calculated with ten stretching force constants and eight bending force constants in the nickel compound and ten stretching and nine bending force constants in cobalt compound. The theoretically obtained values of Raman and infrared wave numbers exhibit a satisfactory agreement with the experimental values. A complete assignment of these frequencies to specific modes has also been made.
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