M. N. Palatnikov*, V. A. Sandler, N. V. Sidorov, O. V. Makarova,
I. V. Biryukova, I. N. Efremov, and D. V. Ivanenko
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Kola Science Center of the Russian Academy of Sciences,
Akademgorodok 26a, Apatity, Murmansk oblast, 184209 Russia
* e-mail: palat_mn@chemy.kolasc.net.ru
Received March 6, 2015
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 mea-
surements 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 piezo-
electric coefficient d333 increases to nearly maximum values available in the reference literature for nominally
pure single-domain LiNbO3 crystals.
DOI: 10.1134/S1063783415080235
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