研究者詳細 - 谷口　博基

論文 - 谷口　博基

分割表示 307 件中 121 - 140 件目／全件表示 >>

是枝聡肇, 藤井康裕, 谷口博基

日本結晶学会誌 57 巻 ( 4 ) 頁： 219-225 2015年

記述言語：英語掲載種別：研究論文（学術雑誌）

We report the broadband light-scattering spectroscopy of a single crystal of a prototypical relaxor ferroelectric, Pb（Mg1/3Nb2/3）O3. A self-similar, "power-law central peak" has been observed, indicating the presence of a fractal in the crystal. A strong correspondence exists between the temperature dependence of the power exponent, and that of the reported behaviors of "polar nanoregions", which consist of the fractal percolation cluster in the crystalline matrix of the material.

DOI： 10.5940/jcrsj.57.219

角度分解偏光ラマン分光による結晶性試料の振動モード解析

藤井康裕, 是枝聡肇, 清水荘雄, 谷口博基

日本結晶学会誌 57 巻 ( 5 ) 頁： 285-290 2015年

記述言語：英語掲載種別：研究論文（学術雑誌）

Phonon properties of lead titanate were investigated by measuring polarization-direction dependence of Raman intensities. Quantitative angle-resolved Raman spectroscopy is advantageous for detecting anisotropic nature of the sample material since that reflects the symmetry of vibrational modes. In this study, a broadband half-waveplate was utilized to establish high quantitativity, stability, and spatial reliability of the angle-resolved measurement.

DOI： 10.5940/jcrsj.57.285

Ruthenium oxide as a thermoelectric material: unconventional thermoelectric properties of Li2RuO3 査読有り

Ichiro Terasaki, Shuhei Abe, Yukio Yasui, Ryuji Okazaki, Hiroki Taniguchi

JOURNAL OF MATERIALS CHEMISTRY C 3 巻 ( 40 ) 頁： 10430 - 10435 2015年

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

Ruthenium oxides are typical strongly correlated electron systems, where various ordering phenomena occur through delicate interplay among the charge, spin and orbital degrees of freedom. We propose that the thermoelectric properties can be improved by controlling such ordered phases in strongly correlated electron systems. Honeycomb Ru oxide Li2RuO3 is a prime example that exhibits a unique phase transition at 540 K with a charge gap. We have found that the ordered state can be modified by substituting the Ru site partially, and succeeded in increasing the thermopower by keeping the resistivity around the same value to enhance the power factor substantially.

DOI： 10.1039/c5tc01619c

Web of Science

Ruthenium oxide as a thermoelectric material: Unconventional thermoelectric properties of Li<inf>2</inf>RuO<inf>3</inf> 査読有り

Ichiro Terasaki, Shuhei Abe, Yukio Yasui, Ryuji Okazaki, Hiroki Taniguchi

Journal of Materials Chemistry C 3 巻 ( 40 ) 頁： 10430 - 10435 2015年

掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry 2015. Ruthenium oxides are typical strongly correlated electron systems, where various ordering phenomena occur through delicate interplay among the charge, spin and orbital degrees of freedom. We propose that the thermoelectric properties can be improved by controlling such ordered phases in strongly correlated electron systems. Honeycomb Ru oxide Li2RuO3 is a prime example that exhibits a unique phase transition at 540 K with a charge gap. We have found that the ordered state can be modified by substituting the Ru site partially, and succeeded in increasing the thermopower by keeping the resistivity around the same value to enhance the power factor substantially.

DOI： 10.1039/c5tc01619c

Scopus

21pCJ-2 ペロブスカイト型酸化物における強誘電性発現機構と新規強誘電体設計

谷口博基

日本物理学会講演概要集 70 巻 ( 0 ) 頁： 2698 - 2699 2015年

21aCH-3 PMN-PTの広帯域光散乱分光III

小川智大, 酒井洋徳, 片山大輔, 藤井康裕, 是枝聡肇, 谷口博基

日本物理学会講演概要集 70 巻頁： 2664 - 2664 2015年

21pBC-10 CaRu_<1-x>Sc_xO_3における磁性と輸送特性の相関

山本貴史, 岡崎竜二, 谷口博基, 寺崎一郎

日本物理学会講演概要集 70 巻頁： 2024 - 2024 2015年

21aCH-4 PMN-PT単結晶のラマン分光

藤井康裕, 小川智大, 酒井洋徳, 是枝聡肇, 谷口博基

日本物理学会講演概要集 70 巻頁： 2665 - 2665 2015年

22pCH-8 アルミネートゼオライトCa_8[Al_<12>O_<24>](WO_4)_2[CAW]における強誘電性

前田悠作, 森吉千佳子, 黒岩芳弘, 廣瀬左京, 岡崎竜二, 寺崎一郎, 谷口博基

日本物理学会講演概要集 70 巻頁： 2738 - 2738 2015年

Photo-transport properties of Pb2CrO5 single crystals 査読有り

P. S. Mondal, R. Okazaki, H. Taniguchi, I. Terasaki

Journal of Applied Physics 116 巻 ( 19 ) 頁： 193706 2014年11月

Structural changes and microstructures in stuffed tridymite-type compounds Ba1-xSrxAl2O4 査読有り

Tanaka Eri, Ishii Yui, Teukasaki Hirofumi, Taniguchi Hiroki, Mori Shigeo

JAPANESE JOURNAL OF APPLIED PHYSICS 53 巻 ( 9 ) 2014年10月

Structural Phase Transition and Microstructures in Stuffed Tridymite-Type Compounds; Ba(Al, Fe)(2)O-4

Mori S., Katsumura S., Ozaki T., Tanaka E., Ishii Y., Kurushima K., Kubota Y., Taniguchi H.

FERROELECTRICS 464 巻 ( 1 ) 頁： 116 - 121 2014年5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：Ferroelectrics

We have investigated structural phase transition and changes of microstrucrtures in BaAl2O4 with the tridymite tetrahedral framework structure by transmission electron microscopy experiments in the temperature range between 100 K and 298 K. In our polycrystalline samples the transition from the paraelectric phase with the P6322 space group to the ferroelectric (FE) phase took place around 250 K, which ccompanie with the appearance of the modulated structure with the three equivalent modulation wave vectors, q = 1/2<100>. Real-space images revealed that the FE phase should consist of nanodomains with the 10 ∼ 20 nm size. In addition, it is revealed that partial substitution of Fe3+ for Al3+ in BaAl2O4 induced structural phase transition to themodulated structure with q = 1/3<110> around x ∼ 0.50 in Ba(Al 1-xFex)2O4.

DOI： 10.1080/00150193.2014.893160

Web of Science

Scopus

Pseudogap Observed in the Charge Transport in the Thermoelectric Oxide Ca3−xBixCo4O9 Single Crystals 査読有り

Yu-Chin Hsieh, Ryuji Okazaki, Hiroki Taniguchi, Ichiro Terasaki

Journal of the Physical Society of Japan 83 巻 ( 5 ) 頁： 054710 2014年5月

Pseudogap Observed in the Charge Transport in the Thermoelectric Oxide Ca3−xBixCo4O9 Single Crystals

Hsieh Yu-Chin, Okazaki Ryuji, Taniguchi Hiroki, Terasaki Ichiro

Journal of the Physical Society of Japan 83 巻 ( 5 ) 頁： 54710 - 54710 2014年5月

Electrical oscillation in SmS induced by a constant external voltage 査読有り

Takahashi H., Okazaki R., Taniguchi H., Terasaki I., Saito M., Imura K., Deguchi K., Sato N. K., Suzuki H. S.

PHYSICAL REVIEW B 89 巻 ( 19 ) 2014年5月

Raman Tensor Analysis of Crystalline Lead Titanate by Quantitative Polarized Spectroscopy 査読有り

Fujii Y., Noju M., Shimizu T., Taniguchi H., Itoh M., Nishio I.

FERROELECTRICS 462 巻 ( 1 ) 頁： 8 - 13 2014年4月

Hierarchical dielectric orders in layered ferroelectrics Bi2SiO5 査読有り

Kim Younghun, Kim Jungeun, Fujiwara Akihiko, Taniguchi Hiroki, Kim Sungwng, Tanaka Hiroshi, Sugimoto Kunihisa, Kato Kenichi, Itoh Mitsuru, Hosono Hideo, Takata Masaki

IUCRJ 1 巻 ( Pt 3 ) 頁： 160 - 164 2014年4月

Photo-induced change of dielectric response in BaCoSiO4 stuffed tridymite 査読有り

Taniguchi Hiroki, Moriwake Hiroki, Kuwabara Akihide, Okamura Takuma, Yamamoto Takafumi, Okazaki Ryuji, Itoh Mitsuru, Terasaki Ichiro

JOURNAL OF APPLIED PHYSICS 115 巻 ( 16 ) 2014年4月

Growth and characterization of Cu2ZnSn(SxSe1-x)(4) alloys grown by the melting method 査読有り

Nagaoka Akira, Yoshino Kenji, Taniguchi Hiroki, Taniyama Tomoyasu, Kakimoto Koichi, Miyake Hideto

JOURNAL OF CRYSTAL GROWTH 386 巻頁： 204 - 207 2014年1月

Epitaxial growth of metastable multiferroic AlFeO3 film on SrTiO3 (111) substrate 査読有り

Hamasaki Yosuke, Shimizu Takao, Taniguchi Hiroki, Taniyama Tomoyasu, Yasui Shintaro, Itoh Mitsuru

APPLIED PHYSICS LETTERS 104 巻 ( 8 ) 2014年

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