Investigation of the Piezoelectric Resonance in Stoichiometric LiNbO3 Crystals at High Temperatures and Conductivities

Abstract

The piezoelectric characteristics, dielectric properties, and ionic conductivity of close-to-stoichiometry LiNbO $$_{{{{3}_{{{\text{stoich}}}}}}}$$ crystals have been investigated in a wide temperature range (300–850 K) with the aim of establishing the conditions of use of lithium-niobate-based piezoelectric resonators at high temperatures and, accordingly, high conductivities. It is shown that the piezoelectric phenomenon in LiNbO $$_{{{{3}_{{{\text{stoich}}}}}}}$$ crystals is observed in a certain temperature range ΔT (and, correspondingly, at certain static-conductivity relaxation times ΔτV) and a frequency range ΔωR at the condition $$\tau _{V}^{{ - 1}}$$ $$ \ll $$ ωR satisfied. Apparently, not only LiNbO $$_{{{{3}_{{{\text{stoich}}}}}}}$$ crystals exhibit such regularities, but also some other piezoelectric materials.