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Shotaro Ishikawa,Yuuki Kitanaka,Takeshi Oguchi,Yuji Noguchi,Masaru Miyayama,Chikako Moriyoshi,Yoshihiro Kuroiwa 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
Domain structures and dynamics of BaTiO<SUB>3</SUB> single crystals under in-situ electric fields along <101> were investigated by using synchrotron radiation single-crystal X-ray diffractions. Diffraction patterns clearly show the presence of a 90 o domain structure in crystals poled along <101>. The linear characteristics of strain and polarization with unipolar electric fields along <101> suggested that the 90˚ domain structures established by poling treatments do not change by applying electric fields. The diffraction analysis, however, provides direct evidence of a reversible change in the volume fractions of two kinds of the 90˚ domains under unipolar in-situ electric fields.
Ken Yanai,Hiroaki Onozuka,Yuuki Kitanaka,Yuji Noguchi,Masaru Miyayama,Chikako Moriyoshi,Yoshihiro Kuroiwa,Kousuke Kurushima,Shigeo Mori 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
Single crystals of ferroelectric (Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>)TiO<SUB>3</SUB> were successfully grown by the top-seeded solution growth method at a high oxygen pressure of 0.9쟋Pa and their polarization switching dynamics along <100><SUB>c</SUB> and their domain structures were investigated. Piezoelectric force microscope (PFM) observations show that BNT crystals poled along <100><SUB>c</SUB>. had 71-degree domains in which the spontaneous polarization (<I>P</I><SUB>s</SUB>) vector is opposite to the poling electric fields. Synchrotronradiation single-crystal X-ray diffraction analyses and the PFM observations reveal that the polarization switching in the BNT crystals along <100><SUB>c</SUB> is achieved by a 71-degree rotation of the <I>P</I><SUB>s</SUB> vector.
Defect control for polarization switching in BiFeO<sub>3</sub> single crystals
Chishima, Yuji,Noguchi, Yuji,Kitanaka, Yuuki,Miyayama, Masaru IEEE 2010 and Frequency Control Vol.57 No.10
<P>BiFeO<SUB>3</SUB> (BFO) single crystals were grown and the effects of Zn and Mn co-doping on the polarization and leakage current properties were investigated at 25°C for establishing materials design based on defect chemistry. Although Zn doping or Mn doping led to a deterioration in the properties, Zn-Mn co-doping led to a large remanent polarization (36 μC/cm<SUP>2</SUP>), a low coercive field (19 kV/cm), and a relatively low leakage current density (~10<SUP>-8</SUP> A/cm<SUP>2</SUP>). It is proposed that defect dipoles composed of Zn<SUP>2+</SUP> and Mn<SUP>4+</SUP> act as effective nucleation sites for ferroelectric domains during polarization switching in BFO crystals.</P>