Abstract
A significant spontaneous unipolarity in initially polydomain LiNbO3: Zn crystals doped in the range of “threshold” impurity concentrations (∼4.5–4.7 mol %) has been revealed from high-temperature measurements and after high-temperature annealing under short circuit conditions. The effect of strong increase in the spontaneous unipolarity is accompanied by a pronounced low-frequency dielectric dispersion and abrupt anomalies in the temperature dependences of the electrical conductivity and dielectric permittivity. The piezoelectric coefficient d333 increases to nearly maximum values available in the reference literature for nominally pure single-domain LiNbO3 crystals.
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