Abstract
We have researched piezoelectric, dielectric properties and ion conductivity in near-stoichiometric LiNbO3 crystals (NSLN) in order to establish conditions for application of LiNbO3 based piezoelectric resonators in the high-temperature region (∼300–850 K) which implies high conductivity. NSLN crystals have been grown from a congruent melt (R=Li/Nb≈0.946) with 5.5 wt% K2O flux. We have revealed that piezoelectric resonance in NSLN crystals appears in a certain temperature range ΔT and resonance frequencies ΔωR provided that τV−1≪ωR. The temperature range ΔT corresponds to certain values of conductivity (Δσ) and relaxation time (ΔτV) range. We have concluded that application of high-temperature piezoelectric resonators based on crystal NSLN is possible at certain kinetic parameters of charge transport in a temperature range ΔT and at piezoelectric resonance frequencies corresponding to the temperature range.
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