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Journal Articles

Dielectric studies on the phase transitions of {(NH$$_{4}$$)$$_{3}$$H(SO$$_{4}$$)$$_{2}$$}$$_{1}$$$$_{-}$$$$_{x}$${ND$$_{4}$$)$$_{3}$$D(SO$$_{4}$$)$$_{2}$$}$$_{x}$$ system; Ferroelectricity in (NH$$_{4}$$)$$_{3}$$H(SO$$_{4}$$)$$_{2}$$

*; *;

Journal of the Physical Society of Japan, 49(2), p.593 - 598, 1980/00

https://doi.org/10.1143/JPSJ.49.593
 Times Cited Count：33 Percentile：85.63(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Pressure-induced ferroelectricity in (NH$$_{4}$$)$$_{3}$$(SO$$_{4}$$)$$_{2}$$

Journal of the Physical Society of Japan, 41(4), p.1437 - 1438, 1976/04

https://doi.org/10.1143/JPSJ.41.1437
 Times Cited Count：40

no abstracts in English

Oral presentation

Local structure analysis of KNbO$$_3$$ by high-energy X-ray diffraction

Yoneda, Yasuhiro; Ohara, Koji*; Nagata, Hajime*

no journal, , 

KNbO$$_3$$ has been a candidate for the end member of a non-Pb ferroelectric materials. We performed local structure analysis of KNbO$$_3$$ bulk ceramics by high-energy synchrotron X-ray measurements. It has recently established that temperature-driven structural phase transitions in several perovskite ferroelectric materials (PbTiO$$_3$$, BaTiO$$_3$$, and NaNbO$$_3$$) believed to be purely displacive, have a significant order-disorder component. We performed the local structure analysis in a wide-temperature range to observe order-disorder feature of KNbO$$_3$$. The lowest temperature structure of KNbO$$_3$$ is rhombohedral, and we found that the local rhombohedral distortion maintained in the high-temperature cubic phase.

Oral presentation

Behavior of rigid cubes in soft mediums in agitation or under compression

Saito, Junichi; Takesue, Naohisa*; Kiba, Kazumasa*; Kudo, Junki*; Matsuo, Naoki*

no journal, , 

Oral presentation

Synthesis and integration of barium titanate nanoparticles

Saito, Junichi; Kiba, Kazumasa*; Kudo, Junki*; Matsuo, Naoki*; Takesue, Naohisa*

no journal, , 

Oral presentation

Synthesis and solid solutionaization of nanoparticles of barium titanate and barium zirconate

Saito, Junichi; Kudo, Junki*; Kiba, Kazumasa*; Matsuo, Naoki*; Takesue, Naohisa*

no journal, , 

Oral presentation

Synthesis and solid solutionaization of nanoparticles of barium titanate, barium zirconate, and calcium titanate

Saito, Junichi; Matsuo, Naoki*; Kiba, Kazumasa*; Kudo, Junki*; Takesue, Naohisa*

no journal, , 

Oral presentation

X-ray PDF analysis of BiFeO$$_3$$-Bi(Mg,Ti)O$$_3$$ mixture

Yoneda, Yasuhiro; Wada, Satoshi*

no journal, , 

BiFeO$$_3$$ is a useful ferroelectric material, but it is not easy to reverse the polarization because the rhombohedral structure of the ferroelectric phase is greatly distorted, and attempts have been made to improve the dielectric properties by various additives. BaTiO$$_3$$ and Bi(Mg$$_{0.5}$$Ti$$_{0.5}$$)O$$_3$$ were selected as additives, and structural analysis was performed using synchrotron radiation. BiFeO$$_3$$ has a rhombohedral structure and BaTiO$$_3$$ has a tetragonal structure. Bi(Mg$$_{0.5}$$Ti$$_{0.5}$$)O$$_3$$ has an antiferroelectric orthorhombic structure and is expected to behave as a buffer that binds BiFeO$$_3$$ and BaTiO$$_3$$. The process of averaging the structure from micro to macro was clarified, and various changes were observed depending on the temperature. The flexibility of such a structure reduces the large distortion of BiFeO$$_{3}$$ and enables polarization.

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