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arXiv · 1309.5726

Ferroelectric and dielectric characterization studies on relaxor- and ferroelectric-like strontium-barium niobates

K. Matyjasek·J. Dec·S. Miga·T. Lukasiewicz
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Abstract

Ferroelectric domain structure evolution induced by an external electric field was investigated by means of nematic liquid crystal (NLC) method in two strontium-barium niobate single crystals of nominal composition: Sr_{0.70}Ba_{0.30}Nb_{2}O_{6} (SBN:70 - relaxor) and Sr_{0.26}Ba_{0.74}Nb_{2}O_{6} (SBN:26 - ferroelectric). Our results provide evidence that the broad phase transition and frequency dispersion that are exhibited in SBN:70 crystal have a strong link to the configuration of ferroelectric microdomains. The large leakage current revealed in SBN:26 may compensate internal charges acting as pinning centers for domain walls, which gives rise to a less restricted domain growth similar to that observed in classical ferroelectrics. Microscale studies of a switching process in conjunction with electrical measurements allowed us to establish a relationship between local properties of the domain dynamics and macroscopic response i.e., polarization hysteresis loop and dielectric properties.

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K. Matyjasek, J. Dec, S. Miga, T. Lukasiewicz. 2013-09-23. Ferroelectric and dielectric characterization studies on relaxor- and ferroelectric-like strontium-barium niobates. https://doi.org/10.5488/cmp.16.31701

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