Piezoelectric resonance study of polycrystalline urea (OC(NH2)(2)) has
been made by the newly developed inductive method employing a standar
d pulsed NMR spectrometer. It is shown that the temperature and DC ele
ctric field dependence of the piezoelectric resonance parameters prove
s to be a very sensitive indicator of the electromechanical changes in
piezoelectric materials.