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Journal Articles

Structural characterization and dielectric properties of hexagonal Lu(Fe,Ti)O$$_{3}$$

Matsuo, Yoji*; Hoshiyama, Takuya*; Mori, Shigeo*; Yoshii, Kenji; Michiue, Yuichi*; Kambe, Takashi*; Ikeda, Naoshi*; Brown, F.*; Kimizuka, Noboru*

Japanese Journal of Applied Physics, 48(9), p.09KB04_1 - 09KB04_3, 2009/10

https://doi.org/10.1143/JJAP.48.09KB04
 Times Cited Count：1 Percentile：5.3(Physics, Applied)

We have investigated an average crystal structure and microstructures in LuFe$$_{0.56}$$Ti$$_{0.44}$$O$$_{3}$$ by the transmission electron microscopy (TEM), in combination with the dielectric measurements. In this work, high-qualitypolycrystalline samples of LuFe$$_{0.56}$$Ti$$_{0.44}$$O$$_{3}$$ were successfully synthesized in air by the conventional solid state reaction. The average crystal structure at room temperature is characterized by the hexagonal structure (space group: $$P$$6$$_{3}$$ cm). Dielectric measurements revealed that LuFe$$_{0.56}$$Ti$$_{0.44}$$O$$_{3}$$ shows broad dielectric dispersion around 570 K, which should originate from the formation of the polar domain structures on the nanometer scale.

Oral presentation

Elemental substitution effects in the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R=rare earths)

Yoshii, Kenji; Yoneda, Yasuhiro; Ikeda, Naoshi*; Matsuo, Yoji*; Hoshiyama, Takuya*; Horibe, Yoichi*; Mori, Shigeo*

no journal, , 

We have investigated the Fe-site substitution effects in the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R=rare earths). It was found that continuous solid solutions were formed for the Mn substitution; RFe$$_{2-x}$$Mn$$_{x}$$O$$_{4}$$ was synthesized for 0$$underline{<}$$x$$underline{<}$$1. On the other hand, the substitution of other cations (such as Cu and Ga) was possible in limited x regions; e.g., Ga could be substituted for 0$$underline{<}$$x$$underline{<}$$0.4-0.5 It was also found that the low-temperature magnetization and the dielectric constant were reduced by the substitution. Considering the mechanism of dielectric response in RFe$$_{2}$$O$$_{4}$$, the change of the physical properties likely arises from a change of electron transfer between the Fe-site ions.

Oral presentation

Crystal structure and physical properties of RFe$$_{0.56}$$Ti$$_{0.44}$$O$$_{3}$$(R=Lu,Yb)

Hoshiyama, Takuya*; Mori, Shigeo*; Matsuo, Yoji*; Funae, Takeshi*; Kambe, Takashi*; Ikeda, Naoshi*; Kimizuka, Noboru*; Yoshii, Kenji; Michiue, Yuichi*

no journal, , 

We have investigated the crystal structure and physical properties of RFe$$_{0.56}$$Ti$$_{0.44}$$O$$_{3}$$(R=Lu,Yb). The samples were prepared by the solid-state reaction method in air. X-ray and electron diffraction measurements showed that the materials have the same crystal structure as that of multiferroic RMnO$$_{3}$$. Magnetic measurements showed the absence of magnetic transition below 400 K. Dielectric measurements showed the peak of dielectric constant above room temperature, suggesting a existence of ferroelectric phase transition at high temperatures.

Oral presentation

Magnetic/dielectric properties and charge ordering phenomenain YbFe$$_{2-x}$$Mn$$_{x}$$O$$_{4}$$, 2

Matsumoto, Keisuke*; Hoshiyama, Takuya*; Oishi, Daisuke*; Akahama, Hiroshi*; Yoshii, Kenji; Kano, Jun*; Hanasaki, Noriaki*; Kambe, Takashi*; Ikeda, Naoshi*; Mori, Shigeo*

no journal, , 

We have investigated the physical properties of YbFe$$_{2-x}$$Mn$$_{x}$$O$$_{4}$$, a derivative system of the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R: rare earths). Electron diffraction measurements showed taht long-range charge ordering of the Fe-3d charges was observed at room temperature for x=0; this ordering is the origin of ferroelectricity. The x=0.1 oxide showed diffuse scattering patterns at room temperature, instead of the charge-ordered pattern. Thus, 5% Mn substitution can collapse the long-range charge ordering. We will also present the correlation between the magnetic/dielectric properties and the crystal structure.

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