Nuclear Quadrupole Resonance of Li in Ferroelectric Compounds

Measurements have been made of the temperature dependence of the nuclear quadrupole coupling constant, eQq/h, of Li in a number of ferroelectric compounds. The compounds discussed are LiNH₄{C}₄H₄{O}₆·{H}₂$O, LiTl${C}₄H₄{O}₆·{H}₂$O, LiTa${O}₃$, LiNb${O}₃$, and Li${N}₂H₅SO₄. Powdered samples were used in all cases except the first where single crystals were also measured and favorably compared with the powder results.