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Matsuo, Yoji*; Suzuki, Muneyasu*; Noguchi, Yuji*; Yoshimura, Takeshi*; Fujimura, Norifumi*; Yoshii, Kenji; Ikeda, Naoshi*; Mori, Shigeo*
Japanese Journal of Applied Physics, 47(11), p.8464 - 8467, 2008/11
Times Cited Count：11 Percentile：42.15(Physics, Applied)We have investigated the physical properties of LuFeCuO, which is a derivative material of the electronic ferroelectric LuFe
O. From electron diffraction measurements at room temperature, ionic ordering of Fe
and Cu
in the a-b plane was observed. This ordering is similar to that in LuFeO and has an electric dipole. The observation of small domains (5-10 nm) indicates the presence of polar regions. Dielectric measurements showed that a peak of dielectric constant appeared at around 500 K, and the peak value was about 1000, indicating that LuFeCuO is a dielectric material. We will present the experimental data on the samples prepared under high-pressure oxygen.
-BaTiOKitagawa, Shuji*; Horibe, Yoichi*; Yoshii, Kenji; Suzuki, Muneyasu*; Noguchi, Yuji*; Nishihara, Sadafumi*; Hosokoshi, Yuko*; Mori, Shigeo*
Transactions of the Materials Research Society of Japan, 33(1), p.27 - 30, 2008/03
Microstructures related to the ferroelectric (FE) properties in(1-x)BiFeO-xBaTiO were examined mainly by a transmission electron microscopy, in combination with conventional magnetic and dielectric measurements. It was found that macroscopic-sized FE domain structures in BiFeOchanged into fine FE microstructures with the 20-30nm size in the x=0.25compound, as the BaTiO concentration (x) was increased. In addition, we found characteristic tweed-like contrast due to the strain field in the x=0.33 compound at room temperature. We carefully investigated the spatial distribution of the FE microdomains in the x=0.25 compound by obtaining real-space images and determined spatial configuration of the spontaneous polarization in each FE microdomains.
