Faculty Profiles - TANIGUCHI Hiroki

Papers - TANIGUCHI Hiroki

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Unconventional Polarization Response in Titanite-Type Oxides due to Hashed Antiferroelectric Domains

Hiroki Taniguchi, Takumi Watanabe, Taro Kuwano, Akitoshi Nakano, Yukio Sato, Manabu Hagiwara, Hiroko Yokota, Kazuhiko Deguchi

ACS Nano Vol. 18 ( 22 ) page： 14523 - 14531 2024.5

Antiferroelectricity of titanite-type oxide SrTiGeO5 and its potential for power electronics applications Reviewed

Toshiya Uohashi, Taro Kuwano, Manabu Hagiwara, Kenji Natori, Kazuhiko Deguchi, Hiroki Taniguchi

Applied Physics Letters Vol. 124 ( 18 ) page： 182901 2024.4

Antiferroelectricity of titanite-type oxide SrTiGeO5 and its potential for power electronics applications

Toshiya Uohashi, Taro Kuwano, Manabu Hagiwara, Kenji Natori, Kazuhiko Deguchi, Hiroki Taniguchi

Applied Physics Letters Vol. 124 ( 18 ) 2024.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Publishing

Antiferroelectric materials have recently received renewed attention due to the increased demand for energy-storage ceramics and power electronics applications. This study demonstrates antiferroelectricity in a titanite-type oxide, SrTiGeO5, through direct observation of a double D-E hysteresis loop by polarization measurements. Temperature dependence of dielectric permittivity shows a cusp around 550 K, indicating a relatively high antiferroelectric phase transition temperature for SrTiGeO5. It is suggested that an electric-field-induced rise of permittivity in SrTiGeO5 has the potential for application in protective circuits of power electronics devices. The present study paves the way for the development of innovative antiferroelectric applications.

DOI： 10.1063/5.0204239

Scopus

Ferroelectric polycrystalline Bi2SiO5 thin films on Pt-covered Si substrates prepared by pulsed laser deposition combined with post-annealing Reviewed

Haruto Takahashi, Shingo Maruyama, Hiroshi Naganuma, Hiroki Taniguchi, Ryota Takahashi, Shintaro Yasui, Kenichi Kaminaga, Yuji Matsumoto

Journal of Alloys and Compounds Vol. 988 page： 174195 - 174195 2024.3

Antiferroelectric nonlinear polarization response of titanite-type oxide SrTiGeO5 and its temperature dependence Open Access

Uohashi T., Kuwano T., Deguchi K., Taniguchi H.

Meeting Abstracts of the Physical Society of Japan Vol. 79.2 ( 0 ) page： 2455 - 2455 2024

Re-estimation of Maxwell-Wagner relaxation for novel absorbers via (Ta+Ga)-doped rutile-type TiO2 ceramics with various valence proportions and sintering temperatures Reviewed

T. Kuwano, Y. Hashimoto, K. Deguchi, H. Taniguchi

Journal of Alloys and Compounds Vol. 966 2023.12

Dielectric Materials with Hyperordered Structures Reviewed

Hiroki Taniguchi

Hyperordered Structures in Materials: Disorder in Order and Order within Disorder page： 313 - 331 2023.10

Direct microwave energy input on a single cation for outstanding selective catalysis Reviewed Open Access

F. Kishimoto, T. Yoshioka, R. Ishibashi, H. Yamada, K. Muraoka, H. Taniguchi, T. Wakihara, K. Takanabe

Science advances Vol. 9 ( 33 ) 2023.8

Structural origins of the unusual thermal stability of amorphous CuxGe50-xTe50 (0 ≤ x ≤ 33.3) Reviewed International coauthorship Open Access

J.R. Stellhorn, B. Paulus, B.D. Klee, M. Inui, H. Taniguchi, Y. Sutou, S. Hosokawa, W.C. Pilgrim

Journal of Physics Condensed Matter Vol. 35 ( 30 ) 2023.8

Temperature-Stable Linear Dielectric Response of Low-Temperature Sintered La-Doped Bi2SiO5 Ceramics Reviewed

Y. Yasumoto, T. Kuwano, H. Taniguchi, S. Fujihara, M. Hagiwara

ACS Applied Electronic Materials Vol. 5 ( 8 ) page： 4323 - 4329 2023.7

Ferroelectricity in oxygen-deficient perovskite-type oxide Sr10Ga6Sc4O25 Reviewed Open Access

A. Nakano, I. Terasaki, H. Taniguchi

Journal of Materials Chemistry C Vol. 11 ( 25 ) page： 8541 - 8546 2023.6

Ferroelectric Ionic Molecular Crystals with Significant Plasticity and a Low Melting Point: High Performance in Hot-Pressed Polycrystalline Plates and Melt-Grown Crystalline Sheets Reviewed

J. Harada, H. Takahashi, R. Notsuka, M. Takehisa, Y. Takahashi, T. Usui, H. Taniguchi

Angewandte Chemie - International Edition Vol. 62 ( 3 ) page： e202215286 2023.1

エマージェント物性を生みだす超秩序構造の創出ー特に誘電体材料に関してー Reviewed

谷口博基

セラミックス Vol. 58 page： 505 - 508 2023

Controlling dielectric properties of Nb + X (X = Al, Ga, In) co-doped and Nb-doped rutile-type TiO2 single crystals Reviewed

S. Kakimoto, Y. Hashimoto, T. Kuwano, K. Kimura, K. Hayashi, M. Hagiwara, K. Deguchi, H. Taniguchi

Journal of Materials Chemistry C Vol. 11 ( 4 ) page： 1304 - 1310 2022.12

Hyper-Ordered Structures in Dielectric Materials Reviewed International coauthorship

M. Deluca, H. Taniguchi

Journal of the Physical Society of Japan Vol. 91 ( 9 ) page： 091001 2022.9

Phase variation of ferroelectric Li2Sr1−xCax(Nb1−xTax)2O7 by selective reinforcement in the (Nb,Ta)-O covalent bonds Reviewed

A. Nakano, H. Shirakuni, T. Nagai, Y. Mochizuki, F. Oba, H. Yokota, S. Kawaguchi, I. Terasaki, H. Taniguchi

Physical Review Materials Vol. 6 ( 4 ) page： 044412 2022.4

High-Pressure Thermopower of the Mott Insulator Ca2RuO4 Reviewed Open Access

I. Sano, T. Nakano, A. Nakano, H. Taniguchi, F. Nakamura, I. Terasaki

Journal of the Physical Society of Japan Vol. 91 ( 3 ) page： 033703 2022.3

Language：English Publishing type：Research paper (scientific journal)

We have measured and analyzed the thermopower of single-crystal samples of the Mott insulator Ca2RuO4 in high pressure up to 0.9 GPa. We find that the thermopower rapidly changes at a metal-insulator transition temperature, which is explained in terms of a percolation theory. In contrast, the thermopower in the insulator phase slightly decreases with increasing pressure well below the transition temperature, and is associated with thermodynamic quantities through the Kelvin formula. The pressure dependence is compared with the current-density dependence, and a possible origin for the current-enhanced thermopower is proposed.

DOI： 10.7566/JPSJ.91.033703

Open Access

Web of Science

Scopus

A large piezoelectric voltage coefficient in aluminate-sodalite-type improper ferroelectric oxides Reviewed

H. Taniguchi, T. Hattori, T. Isobe, A. Nakano, I. Terasaki, M. Hagiwara

Journal of Materials Chemistry C Vol. 9 ( 43 ) page： 15649 - 15653 2021.11

Nontrivial Spin Dimer in the Hexagonal Ruthenate Ba3CaRu2O9 Revealed by Nonmagnetic Ion Substitution Reviewed Open Access

D. Nishihara, A. Kimura, A. Nakano, H. Taniguchi, I. Terasaki

Journal of the Physical Society of Japan Vol. 90 ( 11 ) page： 114706 2021.11

Giant Peltier conductivity in an uncompensated semimetal Ta2PdSe6 Reviewed Open Access

A. Nakano, A. Yamakage, U. Maruoka, H. Taniguchi, Y. Yasui , I. Terasaki

Vol. 3 ( 4 ) 2021.10

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Papers - TANIGUCHI Hiroki