93Nb NMR Study of the LiNbO3–LiTaO3 Solid-Solution System

Abstract

The ⁹³Nb nuclear magnetic resonance has been studied in sintered powders of the solid‐solution system LiNbO₃–LiTaO₃. The Nb nuclear quadrupole coupling constant decreases linearly with an increase in LiTaO₃ concentration and this behavior agrees with the calculated electric field gradient. A variation of the ⁹³Nb NMR linewidth with composition was observed which can be explained on the basis of a random distribution of electric field gradients across the solid‐solution range. The linewidths follow closely the well‐known expression for the entropy of a randomly distributed binary solid solution.