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Journal Articles

X-ray topography of piezoelectric La$$_3$$Ta$$_{0.5}$$Ga$$_{5.5}$$O$$_{14}$$ crystal grown by Czochralski method

Yoneda, Yasuhiro; Mizuki, Junichiro; Takeda, Hiroaki*; Shiosaki, Tadashi*

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 55(5), p.971 - 974, 2008/05

We performed synchrotron X-ray topography on a La$$_3$$Ta$$_{0.5}$$Ga$$_{5.5}$$O$$_{14}$$ (LTG) crystal grown by the Czochralski (Cz) method. Since the synchrotron X-ray source can provide high-energy X-rays, one can detect bulk-sensitive information by the X-ray topography. LTG is one of the most attractive piezoelectric crystals like La$$_{3}$$Ga$$_{5}$$SiO$$_{14}$$ (LGS), because of excellent acoustic properties (temperature compensation of acoustic losses). Since LTG single crystals can be grown from stoichiometric melt, single crystals with good crystal quality can be obtained comparing to LGS which can not be grown from stoichiometric system but from congruent melt. The 60-keV X-ray topography revealed that the LTG crystal quality was not the same crystalline quality. The crystal quality of a center parts was worse than that of surroundings.

Journal Articles

Electronic ferroelectricity from charge ordering in RFe$$_{2}$$O$$_{4}$$

Ikeda, Naoshi*; Matsuo, Yoji*; Mori, Shigeo*; Yoshii, Kenji

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 55(5), p.1043 - 1045, 2008/05

We report our recent discovery of novel ferroelectricity arising from the polar ordering of Fe$$^{3+}$$ and Fe$$^{2+}$$ in a mixed valence triangular lattice oxide LuFe$$_{2}$$O$$_{4}$$, where the electric polarization is not a result of ionic displacement. The polar ordering of Fe$$^{3+}$$ and Fe$$^{2+}$$ was confirmed with a resonant X-ray scattering study in SPring-8. The origin of such ordering is the competitive interaction between Fe$$^{3+}$$ and Fe$$^{2+}$$ in the triangular lattice, i.e., the charge frustration. The polar superlattice of Fe$$^{3+}$$ and Fe$$^{2+}$$ develops below 350 K, where the electric polarization appears. The ferroelectricity arising from the polar charge ordering or the polar electron distribution may have great potential for the future application of ferroelectrics.

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