Conditions of application of LiNbO3 based piezoelectric resonators at high temperatures

We have researched piezoelectric, dielectric properties and ion conductivity in near-stoichiometric LiNbO3stoich crystals (NSLN) in order to establish the conditions for the use of piezoelectric resonators based on LiNbO3 crystals in the high-temperature region (~ 300 – 850К) which implies high conductivity. NSLN crystals were grown from a congruent melt (R = Li/Nb ≈ 0.946) with 5.5 wt % K2O. We have revealed that piezo-resonance in NSLN crystals appears in a certain temperature range ΔТ and frequencies ΔR provided that V– 1  R. Note that the temperature range ΔТ corresponds to certain values of conductivity (Δσ) and relaxation time (ΔV). We have concluded that use of high-temperature piezo-resonators based on crystal NSLN is possible at certain kinetic parameters of charge transport in a temperature range ΔТ and at piezo-resonance frequencies corresponding to the temperature range. This dataset contains raw data of different research aimed at reveling of different properties of near-sroichiometric lithium niobate single crystals.

本研究针对近化学计量比铌酸锂（near-stoichiometric LiNbO3，缩写NSLN）晶体的压电谐振（piezo-resonance）性能、介电性能（dielectric properties）与离子电导率（ion conductivity）开展系统探究，旨在确立基于铌酸锂（LiNbO3）晶体的压电谐振器在高温区域（约300~850K，该区域伴随高电导率）的应用条件。NSLN晶体采用掺有5.5 wt%氧化钾（K₂O）的同成分熔体（congruent melt，R=Li/Nb≈0.946）生长制备。研究发现，当τ_V⁻¹远小于ω_R时，NSLN晶体中的压电谐振会出现在特定的温度区间ΔT与频率区间Δω_R内；需注意，该温度区间ΔT对应着特定的电导率区间Δσ与弛豫时间（relaxation time）区间Δτ_V。本研究得出结论：在温度区间ΔT内，当电荷输运（charge transport）满足特定动力学参数，且压电谐振频率与该温度区间相匹配时，基于NSLN晶体的高温压电谐振器具备实际应用可行性。本数据集包含为揭示近化学计量比铌酸锂单晶各项性能所开展的多项研究的原始实验数据。