BEHAVIOR OF DIELECTRIC PERMITTIVITY OF PIEZOMONOCRYSTALL NEAR THE RESONANT FREQUENCY

Abstract

The behavior of the quartz dielectric permittivity ($\epsilon$) depending on the frequency of the applied alternating electric field is investigated. Peculiarities of quartz $\epsilon$ near the resonant frequency in the range from 1 kHz to 1 MHz and shows that the excitation of the piezoelectric crystal odd resonance frequency value of the real part of permittivity repeatedly ($\epsilon^{\prime}$) increases, when the driving frequency of the crystal is close to the resonance frequency of the low frequency and a further increase in the frequency of the alternating electric field, the value of $\epsilon^{\prime}$ abruptly changes sign, becoming negative. The absolute value of $\epsilon^{\prime}$ increases by more than an order of magnitude. With further increase in the excitation frequency value of $\epsilon^\prime$ increases continuously and monotonically and tends to the value off resonance. Similar results were obtained for the odd high harmonics. The imaginary part of permittivity ($\epsilon^{\prime\prime}$ ) negligible in the vicinity of the resonance frequencies of the odd. In the even of resonance frequencies of visible changes of $\epsilon$ is not observed.