Computing of 93Nb NMR Parameters of Solid-State Niobates. The Geometry Matters

Abstract

This work aims at studying the influence of structural parameters on computations of the ⁹³Nb quadrupolar interaction and chemical shift parameters in various niobates using first-principles approaches. We demonstrate that some of the computed NMR parameters, especially the isotropic chemical shift and the quadrupolar coupling constant, may differ either the X-ray crystal structure or a relaxed structure used for the calculation of the spectroscopic properties.