Phonon Hole Burning in some Kinds of Piezoelectric Powder

s. We have studied phonon hole burning phenomenon. According to the plastic deformation model proposed by us, some characteristics of holes depend on the amplitude of resonant oscillation exited and the crystal condition of specimen. We studied the effect of heat treatment for the particles on holes. In NH4HZP04 specimen, the increase of decay time for oscillation and larger holes were found. No definite change was detected in the decay time or the shape of holes in LiNb03 or The shapes of holes and the positions of the hole peak in the M&H&'04 and LiNb03 powders were found to be different from each other. This result suggested that dislocatious as plastic deformation were concerned with hole formation. Hole burning phenomenon is well known in the field of light absorption [I]. Its necessary condition is that materials absorb light energy with certain frequencies, which are different from each other and spread widely and moderately. By applying high amplitude light, a hole as a dip in the absorption spectrum is introduced into by, for example, saturation of light absorption. We applied this notion to absorption of alternating electric field by resonantly oscillating piezoelectric powders [2,3]. The piezoelectric particle whose diameter is about an half of wave length absorbs alternating electric field with the frequency which is expressed with the sound velocity and the wave length. We have observed phonon hole burning in piezoelectric particles whose diameters are slightly different from each other. We introduced a hole into them by applying pulsed rf electric field with large amplitude. We found that the hole was formed by the powders [Z]. We proposed that plastic deformation introduced into specimen by large amplitude strain changed the characteristic of particle oscillation, for example, oscillation decay time and was detected as a hole in the resonant oscillation spectrum. With this plastic deformation model, we expect some difference in the characteristics of holes between specimens with different crystal conditions. In this paper, we report the results on phonon hole burning in some kinds of piezoelectric materials and on the effect of annealing.