Anomalies of dielectric properties and conductivity in single domain LiNbO₃:Zn crystals

M. N. PalatnikovI.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials (ICTREMRM KSC RAS), Apatity, RussiaCorrespondence[email protected] [email protected]

V. A. SandlerI.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials (ICTREMRM KSC RAS), Apatity, Russia

O. V. MakarovaI.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials (ICTREMRM KSC RAS), Apatity, Russia

N. V. SidorovI.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials (ICTREMRM KSC RAS), Apatity, Russia

D. V. ManukovskayaI.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials (ICTREMRM KSC RAS), Apatity, Russia

I. N. EfremovI.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials (ICTREMRM KSC RAS), Apatity, Russia

I. V. BiryukovaI.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials (ICTREMRM KSC RAS), Apatity, Russia

K. BormanisInstitute of Solid State Physics, University of Latvia, Riga, LatviaCorrespondence[email protected] [email protected]

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ABSTRACT

A study of the temperature dependence of dielectric constant, conductivity, and piezoelectric modulus in the single-domain state of LiNbO₃ crystals modified by Zn admixture at threshold concentration is reported. Unipolarity of the LiNbO₃:Zn crystals is observed to increase after treatment of brand-new samples by high-temperature electro-diffusion annealing and by subsequent high-temperature annealing of short-circuited samples. The observed effects are explained as a result of meta-stable residual domains collapsing at high temperature the collapse being assisted by disintegration of charged clusters stabilizing domain walls. The rise of unipolarity is accompanied by anomalies on the σ(T) and ϵ(T) dependences and by a significant increase of the value of the piezo-modulus.

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Anomalies of dielectric properties and conductivity in single domain LiNbO₃:Zn crystals

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Anomalies of dielectric properties and conductivity in single domain LiNbO₃:Zn crystals