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

• Дата: 2013
• Автори: Matyjasek, K., Dec, J., Miga, S., Łukasiewicz, T.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут фізики конденсованих систем НАН України 2013
• Назва видання: Condensed Matter Physics
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/120830
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Ferroelectric and dielectric characterization studies on relaxor- and ferroelectric-like strontium-barium niobates / K. Matyjasek, J. Dec, S. Miga, T. Łukasiewicz // Condensed Matter Physics. — 2013. — Т. 16, № 3. — С. 31701:1-10. — Бібліогр.: 29 назв. — англ.

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: Sr₀.₇₀Ba₀.3₀Nb₂O₆ (SBN:70 - relaxor) and Sr₀.₆a₀.₇₄Nb₂O₆ (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.