Polar Perovskite高品質単結晶の育成—AgNbO₃を例に—

抄録

  It is reported that a crystal growth under high-oxygen-pressure atmosphere yields high-performance single crystals of ferrielectric AgNbO₃. A single crystal grown via the Czochralski method at an oxygen pressure P_O2 of 0.9 MPa exhibits a large polarization associated with a marked change in polarization hysteresis under an application of high electric field. Chemical analysis reveals that an increase in P_O2 during crystal growth suppresses the deficiency of Ag and leads to a low leakage current. It is demonstrated that the AgNbO₃ single crystal shows ferrielectric polarization associated with an electric-filed-induced phase transition to a ferroelectric phase under electric fields along the [110] axis.