Nuclear Quadrupole Coupling Constants ofLi7in Lithium Compounds

Abstract

Quadrupolar splittings of ${\mathrm{Li}}^7$ nuclear magnetic resonance have been detected and measured in powders of LiOH, LiOH·${\mathrm{H}}_2$O, LiN${\mathrm{O}}_3$, LiN${\mathrm{O}}_3$·${3\mathrm{H}}_2$O, LiI${\mathrm{O}}_3$, ${\mathrm{Li}}_3$P${\mathrm{O}}_4$, ${\mathrm{Li}}_2$Ti${\mathrm{O}}_3$, and ${\mathrm{Li}}_2$ ${\mathrm{ZrO}}_3$. The theoretical powder pattern for a nonvanishing asymmetry parameter, $\eta$, has been checked by observations in spodumene, LiAl${\left(\mathrm{S}\mathrm{i}{\mathrm{O}}_3\right)}_2$, and applied in the analysis of several of the observed spectra. It was found necessary to shorten the ${\mathrm{Li}}^7$ spin-lattice relaxation time, $T_1$, in most of the compounds before successful measurements could be made.