研究者詳細 - 谷口　博基

論文 - 谷口　博基

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Ferroelectricity in Perovskite-Type Oxides 査読有り

谷口博基

Ferroelectrics 369 頁： 127 - 132 2008年

Ferroelectric Phase Transition of Cd_2Nb_2O_7 Studied by Raman Scattering 査読有り

谷口博基

Physical Review B vol.77 2008年

Dynamics of the Ferroelectric Phase Transition in ^<18>O-exchanged SrTiO_3 Studied by Raman Scattering 査読有り

谷口博基

Ferroelectrics 369 頁： 3 - 9 2008年

Direct Observation of the Soft Mode in the Paraelectric Phase of PbTiO_3 by Confocal Micro-Raman Scattering 査読有り

谷口博基

Physical Review B vol.78 2008年

Direct Observation of the Soft Mode in the Paraelectric Phase of PbTiO_3 by Confocal Micro-Raman Scattering 査読有り

谷口博基

Physical Review B 78 2008年

Origin of Giant Dielectric Response in Nonferroelectric CaCu_3Ti_4O_12 : Inhomogeneous Conduction Nature Probed by Atomic Force Microscopy 査読有り

谷口博基, 谷山智康

Chemistry of Materials vol.20 頁： 1694 - 1698 2008年

Temperature Evolution of the Optical Phonons in Pb(Ni_<1/3>Nb_<2/3>)O_3 Single Crystals Studied by Raman Scattering 査読有り

谷口博基

Ferroelectrics 369 頁： 67 - 72 2008年

Successive Crystallization of Ferroelectric-based BaTi_2O_5 Bulk Glass Studied by Raman Scattering 査読有り

谷口博基

Materials Science and Engineering B 148 頁： 48 - 52 2008年

Reply to Comment on “Origin of Giant Dielectric Response in Nonferroelectric CaCu_3Ti_4O_<12> : Inhomogeneous Conduction Nature Probed by Atomic Force Microscopy" 査読有り

谷口博基, 谷山智康

Chemistry of Materials" 20 頁： 6286 - 6287 2008年

Piezoelectric Properties of Lithium Modified Silver Niobate Perovskite Single Crystals 査読有り

谷口博基, 谷山智康

Applied Physics Letters vol.92 2008年

Critical soft-mode dynamics and unusual anticrossing in CdTi O3 studied by Raman scattering 査読有り

Hiroki Taniguchi, Yue Jin Shan, Hajime Mori, Mitsuru Itoh

Physical Review B - Condensed Matter and Materials Physics 76 巻 ( 21 ) 2007年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

The ferroelectric phase transition and the critical soft-mode behavior of CdTi O3 were investigated by confocal micro-Raman scattering. The soft mode softens toward zero frequency at Tc with the underdamped vibrational state, indicating ideal displacive-type ferroelectric phase transition. The continuous development of the spectra of ferroelectric modes clarified the second-order phase transition of CdTi O3. The soft mode undergoes an unusual splitting during the softening, which is reasonably explained by anticrossing between the soft mode and the different symmetry mode due to the local symmetry breakdown into the triclinic one. © 2007 The American Physical Society.

DOI： 10.1103/PhysRevB.76.212103

Scopus

Critical soft-mode dynamics and unusual anticrossing in CdTiO3 studied by Raman scattering 査読有り

Hiroki Taniguchi, Yue Jin Shan, Hajime Mori, Mitsuru Itoh

PHYSICAL REVIEW B 76 巻 ( 21 ) 2007年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER PHYSICAL SOC

The ferroelectric phase transition and the critical soft-mode behavior of CdTiO3 were investigated by confocal micro-Raman scattering. The soft mode softens toward zero frequency at T-c with the underdamped vibrational state, indicating ideal displacive-type ferroelectric phase transition. The continuous development of the spectra of ferroelectric modes clarified the second-order phase transition of CdTiO3. The soft mode undergoes an unusual splitting during the softening, which is reasonably explained by anticrossing between the soft mode and the different symmetry mode due to the local symmetry breakdown into the triclinic one.

DOI： 10.1103/PhysRevB.76.212103

Web of Science

Light scattering study of the phase transition in quantum paraelectric strontium titanate

Yagi T., Takesada M., Taniguchi H., Itoh M.

JOURNAL OF THE KOREAN PHYSICAL SOCIETY 51 巻 ( 2 ) 頁： 798-803 2007年8月

Light scattering study of the phase transition in quantum paraelectric strontium titanate 査読有り

T. Yagi, M. Takesada, H. Taniguchi, M. Itoh

Journal of the Korean Physical Society 51 巻 ( 2 PART I ) 頁： 798 - 803 2007年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：KOREAN PHYSICAL SOC

New features of the ferroelectric phase transition are found by using light scattering studies on quantum paraelectric SrTi16O3 (STO16) and its oxygen-isotope exchanged compound SrTi18O3 (STO18). The ferroelectric Eu mode observed by using high-resolution spectroscopy with interferometry shows a perfect softening at the phase transition point of the ferroelectric STO18-95, where 95 % of the oxygen atoms are replaced by the oxygen isotope 18O. The phase transition is concluded to be an ideal displacive-type transition accompanied with the complete freezing of the Slater-type polar mode. The role of the substituted 18O atoms is elucidated in more detail by using low-frequency Raman scattering below 1 K with a triple monochromator. The dynamical inhomogeneity enhanced by the inhomogeneous distribution of 18O atoms plays an essential role in quantum paraelectric STO18 where the concentration of 18O is less than the critical value of 33 %. Both the decrease in the frequency of the polar modes as a mass effect and the enhancement of the dynamical inhomogeneity take place cooperatively in the quantum paraelectric-ferroelectric phase transition in STO18.

Web of Science

Scopus

Ideal soft mode-type quantum phase transition and phase coexistence at quantum critical point in O-18-exchanged SrTiO3 査読有り

Taniguchi Hiroki, Itoh Mitsuru, Yagi Toshirou

PHYSICAL REVIEW LETTERS 99 巻 ( 1 ) 頁： 017602 2007年7月

Recent topics on the light scattering study of ferroelectrics 査読有り

Yagi Toshirou, Takesada Masaki, Taniguchi Hiroki, Itoh Mitsuru

FERROELECTRICS 355 巻 ( 1 PART 1 ) 頁： 3 - 12 2007年

22pTE-3 CdTiO_3における変位型強誘電相転移とソフトモード(誘電体(酸化物系),領域10,誘電体,格子欠陥,X線・粒子線,フォノン物性)

谷口博基, 単躍進, 森基, 伊藤満

日本物理学会講演概要集 62.2.4 巻 ( 0 ) 頁： 996 2007年

Conductive Boundary Layer in CaCu3Ti4O12 with Giant-Dielectric-Response 査読有り

Fu Desheng, Arima Yosuke, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru, Yu Jianding, Koshihara Shin-Ya

FERROELECTRICS 347 巻頁： 140 - 144 2007年

AgNbO3: A lead-free material with large polarization and electromechanical response 査読有り

Fu Desheng, Endo Makoto, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru

APPLIED PHYSICS LETTERS 90 巻 ( 25 ) 2007年

銀系酸化物における巨大電気分極

符徳勝, 遠藤誠, 谷口博基, 谷山智康, 伊藤満

日本セラミックス協会　年会・秋季シンポジウム講演予稿集 2007 巻 ( 0 ) 頁： 503 - 503 2007年

掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本セラミックス協会

Pb系ABO<SUB>3<SUB>型酸化物が優れた圧電性や強誘電性を有するのはA-site元素である鉛と酸素の強い結合性によって生じる原子変位に深く関係すると報告されている。それは非鉛系新規材料の探索に良い指針を与えてくれる。われわれはAg系酸化物に52uC/cm2以上極めて大きな分極が存在することを発見した。その巨大な分極がA-siteのAgとOの結合に由来すると提案している。その発見は新規強誘電体の開発に新たな道を開くことを強く期待している。

DOI： 10.14853/pcersj.2007F.0.503.0

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