NMR Study of Ferroelectric LiNbO3 and LiTaO3. I

Abstract

A study of the ⁷Li nuclear magnetic resonance in a LiNbO₃ single crystal is made and the electric field gradient at the lithium site is determined. Electric‐field‐gradient calculations indicate that the net charge on the niobium is +1.59 while that on the oxygens is −0.86. This shows that the niobate ion is predominately covalently bonded. The ⁹³Nb resonance in a LiNbO₃ single crystal and the ⁷Li resonance in powder samples of LiNbO₃–LiTaO₃ solid solutions are reported.