BEHAVIOR OF DIELECTRIC PERMITTIVITY OF PIEZOMONOCRYSTALL NEAR THE RESONANT FREQUENCY

The behavior of the quartz dielectric permittivity (ϵ) depending on the frequency of the applied alternating electric field is investigated. Peculiarities of quartz ϵ 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 (ϵ′) 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 ϵ′ abruptly changes sign, becoming negative. The absolute value of ϵ′ increases by more than an order of magnitude. With further increase in the excitation frequency value of ϵ′ 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 (ϵ′′ ) negligible in the vicinity of the resonance frequencies of the odd. In the even of resonance frequencies of visible changes of ϵ is not observed.