Ferroelectric Properties and Domain Clamping of (Bi_0.5Na_0.5)TiO₃ Single Crystals Grown under High-Oxygen-Pressure Atmosphere

Abstract:

Top-seeded solution growth method under high-oxygen-pressure atmosphere has been developed for obtaining high-performance and large-sized single crystals of ferroelectric (Bi_0.5Na_0.5)TiO₃ (BNT). Crystals grown at 1000 °C at a Po₂ of 0.9 MPa exhibited a well-saturated hysteresis with a remanent polarization of 34 μC/cm² and a coercive field of 22 kV/cm along <100>_cubic. The spontaneous polarization of BNT along <111>_cubic is estimated to be 59 μC/cm² from the measured polarization properties along <100>_cubic of the crystals obtained. Domain observations using piezoresponse force microscopy revealed that the degraded performance of BNT crystals grown at a low Po₂ is attributed to unswitched 71° domains remaining even after applying a high electric field to the crystals .

• Periodical: Key Engineering Materials (Volume 566)
• Pages: 29-33
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.566.29
• Online since: July 2013
• Authors: Yuuki Kitanaka, Hiroaki Onozuka, Yuji Noguchi, Masaru Miyayama
• Keywords: Leakage Current, Oxygen Vacancies, Piezoresponse Force Microscopy, Polarization Properties, Top Seeded Solution Growth (TSSG)

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