Tomoyuki Yamamoto

2022

Influence of Isostatic Pressure on the Elastic and Electronic Properties of K₂ SiF₆:Mn⁴⁺

Subhoni, M., Zafari, U., Ma, C. G., Srivastava, A. M., Beers, W. W., Cohen, W. E., Brik, M. G., Piasecki, M. & Yamamoto, T., 2022 1月 1, In: Materials. 15, 2, 613.

研究成果: Article › 査読

Open Access

2021

Evaluation of Damage Coefficient for Minority-Carrier Diffusion Length of Triple-Cation Perovskite Solar Cells under 1 MeV Electron Irradiation for Space Applications

Miyazawa, Y., Kim, G. M., Ishii, A., Ikegami, M., Miyasaka, T., Suzuki, Y., Yamamoto, T., Ohshima, T., Kanaya, S., Toyota, H. & Hirose, K., 2021 6月 24, In: Journal of Physical Chemistry C. 125, 24, p. 13131-13137 7 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

First Principles Analysis of Crystal Structure, Electronic and Optical Properties of CsSnI_3–xBr_x Perovskite for Photoelectric Applications

Nematov, D. D., Burhonzoda, A. S., Khusenov, M. A., Kholmurodov, K. T. & Yamamoto, T., 2021 5月, In: Journal of Surface Investigation. 15, 3, p. 532-536 5 p.

研究成果: Article › 査読

2 被引用数 (Scopus)

First-principles investigations of geometrical and electronic structures of Mn⁴⁺ doped A₂SiF₆ (A= K, Rb, Cs) red phosphors

Subhoni, M., Zafari, U., Srivastava, A. M., Beers, W. W., Cohen, W., Brik, M. G. & Yamamoto, T., 2021 5月, In: Optical Materials. 115, 110986.

研究成果: Article › 査読

2 被引用数 (Scopus)

Origin of room-temperature ferromagnetism in Co-doped CeO₂

Tarui, K., Oomori, T., Ito, Y. & Yamamoto, T., 2021 10月 15, In: Physica B: Condensed Matter. 619, 413158.

研究成果: Article › 査読

Theoretical and Experimental Investigations of Mn4+ Site Occupation in CaAl12O19

Sagayama, M., Zafari, U., Subhoni, M., Srivastava, A. M., Beers, W. W., Cohen, W. E., Brik, M. G. & Yamamoto, T., 2021, In: ECS Journal of Solid State Science and Technology. 10, 7, 076004.

研究成果: Article › 査読

Unusual hydrogen implanted gold with lattice contraction at increased hydrogen content

Nguyen, K. T., Hiep Vuong, V., Nguyen, T. N., Nguyen, T. T., Yamamoto, T. & Hoang, N. N., 2021 12月 1, In: Nature communications. 12, 1, 1560.

研究成果: Article › 査読

Open Access

1 被引用数 (Scopus)

2020

Microstructure and diffusion behavior in the multilayered oxides formed on a Co–W electroplated ferritic stainless steel followed by oxidation treatment

Gan, L., Yamamoto, T. & Murakami, H., 2020 8月 1, In: Acta Materialia. 194, p. 295-304 10 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

Recent progress in nanostructured functional materials and their applications

Yamamoto, T., Yoshiya, M. & Nhat, H. N., 2020 11月 25, In: Materials Transactions. 61, 12, p. 2435-2441 7 p.

研究成果: Article › 査読

Open Access

2019

Proton Irradiation Tolerance of High-Efficiency Perovskite Absorbers for Space Applications

Kanaya, S., Kim, G. M., Ikegami, M., Miyasaka, T., Suzuki, K., Miyazawa, Y., Toyota, H., Osonoe, K., Yamamoto, T. & Hirose, K., 2019 11月 21, In: Journal of Physical Chemistry Letters. 10, 22, p. 6990-6995 6 p.

研究成果: Article › 査読

22 被引用数 (Scopus)

Universal topological representation of geometric patterns

Ohmori, S., Yamazaki, Y., Yamamoto, T. & Kitada, A., 2019 8月 7, In: Physica Scripta. 94, 10, 105213.

研究成果: Article › 査読

2018

Theoretical investigation of the breakdown electric field of SiC polymorphs

Yamaguchi, K., Kobayashi, D., Yamamoto, T. & Hirose, K., 2018 3月 1, In: Physica B: Condensed Matter. 532, p. 99-102 4 p.

研究成果: Article › 査読

1 被引用数 (Scopus)

2017

Degradation of CH₃NH₃PbI₃ perovskite due to soft x-ray irradiation as analyzed by an x-ray photoelectron spectroscopy time-dependent measurement method

Motoki, K., Miyazawa, Y., Kobayashi, D., Ikegami, M., Miyasaka, T., Yamamoto, T. & Hirose, K., 2017 2月 28, In: Journal of Applied Physics. 121, 8, 085501.

研究成果: Article › 査読

25 被引用数 (Scopus)

2016

A valence state evaluation of a positive electrode material in an Li-ion battery with first-principles K - And L -edge XANES spectral simulations and resonance photoelectron spectroscopy

Kubobuchi, K., Mogi, M., Matsumoto, M., Baba, T., Yogi, C., Sato, C., Yamamoto, T., Mizoguchi, T. & Imai, H., 2016 10月 14, In: Journal of Applied Physics. 120, 14, 142125.

研究成果: Article › 査読

16 被引用数 (Scopus)

Existence of a polycrystal filled with an arbitrary finite number of self-similar crystals

Kitada, A., Ohmori, S. & Yamamoto, T., 2016 4月 15, In: Journal of the Physical Society of Japan. 85, 4, 045001.

研究成果: Article › 査読

1 被引用数 (Scopus)

2015

In situ measurements of work function of indium tin oxide after UV/ozone treatment

Yamashita, D., Ishizaki, A. & Yamamoto, T., 2015, In: Materials Transactions. 56, 9, p. 1445-1447 3 p.

研究成果: Article › 査読

13 被引用数 (Scopus)

Local environment analysis of Na ions in β-tricalcium phosphate by X-ray absorption near-edge structure measurements and first-principles calculations

Kawabata, K., Yamamoto, T. & Kitada, A., 2015, In: Materials Transactions. 56, 9, p. 1457-1460 4 p.

研究成果: Article › 査読

2 被引用数 (Scopus)

Quantum chemical study of the 1: 1 complex between ferrocene and zinc porphyrin, a building-block of charge-transfer molecular materials

Pichierri, F., Sekine, A. & Yamamoto, T., 2015, In: Materials Transactions. 56, 9, p. 1425-1427 3 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

2014

In situ measurements of the desorption of water from a TiO ₂ surface under dry rir by collecting the photoemission yield with an open counter

Yamashita, D., Ishizaki, A. & Yamamoto, T., 2014, In: Analytical Sciences. 30, 5, p. 575-579 5 p.

研究成果: Article › 査読

6 被引用数 (Scopus)

Substitution Mechanism of Mn and Fe Ions in Bi₄Ti₃O₁₂

Nishimura, K., Yoshioka, T. & Yamamoto, T., 2014 6月 1, In: IEEE Transactions on Magnetics. 50, 6, 6832789.

研究成果: Article › 査読

5 被引用数 (Scopus)

2013

Local environment of silicon in cubic boron nitride

Murata, H., Taniguchi, T., Hishita, S., Yamamoto, T., Oba, F. & Tanaka, I., 2013 12月 21, In: Journal of Applied Physics. 114, 23, 233502.

研究成果: Article › 査読

9 被引用数 (Scopus)

2012

Analysis of charge compensation mechanisms in Pr_1-xA _xCoO₃δ (A = Ca, Sr) by X-ray absorption near-edge structure

Yoshioka, T., Yamamoto, T. & Kitada, A., 2012 7月, In: Japanese journal of applied physics. 51, 7 PART 1, 073201.

研究成果: Article › 査読

2 被引用数 (Scopus)

Co-L ₃ X-ray absorption near-edge structure analysis of Pr _1-xCa _xCoO _3-δ and Pr _1-xSr _xCoO _3-δ

Yoshioka, T., Yamamoto, T. & Kitada, A., 2012 11月 1, In: Physica B: Condensed Matter. 407, 21, p. 4114-4116 3 p.

研究成果: Article › 査読

1 被引用数 (Scopus)

Determination of valence state of Mn ions in Pr _1-xA _xMnO _3-δ (A = Ca, Sr) by Mn-L ₃ X-ray absorption near-edge structure analysis

Kanamori, H., Yoshioka, T., Hirose, K. & Yamamoto, T., 2012 8月 1, In: Journal of Electron Spectroscopy and Related Phenomena. 185, 5-7, p. 129-132 4 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

Electronic structure analysis of Mn- and Fe-codoped In ₂O ₃ by photoemission yield measurements

Yamashita, D., Yoshioka, T., Nishida, S. & Yamamoto, T., 2012 11月 15, In: Physica B: Condensed Matter. 407, 22, p. 4485-4488 4 p.

研究成果: Article › 査読

5 被引用数 (Scopus)

2011

Substitution mechanism of Zn ions in β-tricalcium phosphate

Kawabata, K., Yamamoto, T. & Kitada, A., 2011 2月, In: Physica B: Condensed Matter. 406, 4, p. 890-894 5 p.

研究成果: Article › 査読

23 被引用数 (Scopus)

Valence state analysis of Mn and Fe ions in room-temperature ferromagnetic Mn- and Fe-codoped in ₂ O ₃

Okazaki, T., Yoshioka, T., Kusakabe, Y., Yamamoto, T. & Kitada, A., 2011 12月 1, In: Solid State Communications. 151, 23, p. 1749-1752 4 p.

研究成果: Article › 査読

5 被引用数 (Scopus)

2010

Analysis of local environment of Fe ions in hexagonal BaTiO₃

Chikada, S., Hirose, K. & Yamamoto, T., 2010 9月, In: Japanese journal of applied physics. 49, 9 PART 1, 091502.

研究成果: Article › 査読

19 被引用数 (Scopus)

Electronic structure analysis of Sb-doped BaSnO₃

Yamashita, D., Takefuji, S., Tsubomoto, M. & Yamamoto, T., 2010 1月 1, In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology. 173, 1-3, p. 33-36 4 p.

研究成果: Article › 査読

11 被引用数 (Scopus)

First-principles calculations of the elastic properties of hydroxyapatite doped with divalent ions

Kawabata, K. & Yamamoto, T., 2010 6月, In: Journal of the Ceramic Society of Japan. 118, 1378, p. 548-549 2 p.

研究成果: Article › 査読

Open Access

8 被引用数 (Scopus)

2009

First principles lattice dynamics calculations of Ag⁺ doped KX (X = Cl, Br and I)

Murata, H., Yamamoto, T. & Tanaka, I., 2009 5月, In: Materials Transactions. 50, 5, p. 999-1003 5 p.

研究成果: Article › 査読

Geometric ferroelectricity in rare-earth compounds R GaO3 and R InO3

Tohei, T., Moriwake, H., Murata, H., Kuwabara, A., Hashimoto, R., Yamamoto, T. & Tanaka, I., 2009 4月 1, In: Physical Review B - Condensed Matter and Materials Physics. 79, 14, 144125.

研究成果: Article › 査読

37 被引用数 (Scopus)

Lattice dynamics and thermal properties of SrHfO₃ by first-principles calculations

Murata, H., Yamamoto, T., Moriwake, H. & Tanaka, I., 2009 7月, In: Physica Status Solidi (B) Basic Research. 246, 7, p. 1628-1633 6 p.

研究成果: Article › 査読

8 被引用数 (Scopus)

Local environment analysis of dopants in ceramics by x-ray absorption near-edge structure with the aid of first-principles calculations

Yamamoto, T., Kawashima, Y., Kusakabe, Y., Matsuda, S., Mizuoka, Y., Nakade, Y. & Okajima, T., 2009 5月 18, In: Journal of Physics Condensed Matter. 21, 10, 104211.

研究成果: Article › 査読

15 被引用数 (Scopus)

2008

Atomic structures of supersaturated ZnO- Al2 O3 solid solutions

Yoshioka, S., Oba, F., Huang, R., Tanaka, I., Mizoguchi, T. & Yamamoto, T., 2008, In: Journal of Applied Physics. 103, 1, 014309.

研究成果: Article › 査読

67 被引用数 (Scopus)

Local environment analysis of Mn ions in β-tricalcium phosphate

Kawabata, K., Sato, H. & Yamamoto, T., 2008 1月, In: Journal of the Ceramic Society of Japan. 116, 1349, p. 108-110 3 p.

研究成果: Article › 査読

Open Access

15 被引用数 (Scopus)

2007

Awaking of ferromagnetism in GaMnN through control of Mn valence

Sonoda, S., Tanaka, I., Oba, F., Ikeno, H., Hayashi, H., Yamamoto, T., Yuba, Y., Akasaka, Y., Yoshida, K., Aoki, M., Asari, M., Araki, T., Nanishi, Y., Kindo, K. & Hori, H., 2007, In: Applied Physics Letters. 90, 1, 012504.

研究成果: Article › 査読

14 被引用数 (Scopus)

First-principles XANES simulations of spinel zinc ferrite with a disordered cation distribution

Nakashima, S., Fujita, K., Tanaka, K., Hirao, K., Yamamoto, T. & Tanaka, I., 2007 5月 25, In: Physical Review B - Condensed Matter and Materials Physics. 75, 17, 174443.

研究成果: Article › 査読

102 被引用数 (Scopus)

On a dendrite generated by a zero-dimensional weak self-similar set

Kitada, A., Ogasawara, Y. & Yamamoto, T., 2007 12月, In: Chaos, solitons and fractals. 34, 5, p. 1732-1735 4 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

Thermal annealing effect on magnetism and cation distribution in disordered ZnFe₂O₄ thin films deposited on glass substrates

Nakashima, S., Fujita, K., Tanaka, K., Hirao, K., Yamamoto, T. & Tanaka, I., 2007 3月, In: Journal of Magnetism and Magnetic Materials. 310, 2 SUPPL. PART 3, p. 2543-2545 3 p.

研究成果: Article › 査読

40 被引用数 (Scopus)

2006

Coexistence of Mn²⁺ and Mn³⁺ in ferromagnetic GaMnN

Sonoda, S., Tanaka, I., Ikeno, H., Yamamoto, T., Oba, F., Araki, T., Yamamoto, Y., Suga, K., Nanishi, Y., Akasaka, Y., Kindo, K. & Hori, H., 2006 5月 17, In: Journal of Physics Condensed Matter. 18, 19, p. 4615-4621 7 p.

研究成果: Article › 査読

43 被引用数 (Scopus)

Dilute Ga dopant in TiO₂ by X-ray absorption near-edge structure

Okajima, T., Yamamoto, T., Kunisu, M., Yoshioka, S., Tanaka, I. & Umesaki, N., 2006 9月 7, In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 45, 9 A, p. 7028-7031 4 p.

研究成果: Article › 査読

15 被引用数 (Scopus)

First-principles calculations of migration energy of lithium ions in halides and chalcogenides

Kishida, I., Koyama, Y., Kuwabara, A., Yamamoto, T., Oba, F. & Tanaka, I., 2006 4月 27, In: Journal of Physical Chemistry B. 110, 16, p. 8258-8262 5 p.

研究成果: Article › 査読

21 被引用数 (Scopus)

First-principles study of cation disordering in Mg Al2 O4 spinel with cluster expansion and Monte Carlo simulation

Seko, A., Yuge, K., Oba, F., Kuwabara, A., Tanaka, I. & Yamamoto, T., 2006 3月 23, In: Physical Review B - Condensed Matter and Materials Physics. 73, 9, 094116.

研究成果: Article › 査読

46 被引用数 (Scopus)

2005

Ab initio lattice dynamics and phase transformations of ZrO ₂

Kuwabara, A., Tohei, T., Yamamoto, T. & Tanaka, I., 2005 2月, In: Physical Review B - Condensed Matter and Materials Physics. 71, 6, 064301.

研究成果: Article › 査読

93 被引用数 (Scopus)

Characterization of nanotextured AlN thin films by x-ray absorption near-edge structures

Suga, T., Kameyama, S., Yoshioka, S., Yamamoto, T., Tanaka, I. & Mizoguchi, T., 2005 4月 18, In: Applied Physics Letters. 86, 16, p. 1-3 3 p., 163113.

研究成果: Article › 査読

19 被引用数 (Scopus)

Core-hole effect on dipolar and quadrupolar transitions of SrTiO3 and BaTiO3 at Ti K edge

Yamamoto, T., Mizoguchi, T. & Tanaka, I., 2005 6月 15, In: Physical Review B - Condensed Matter and Materials Physics. 71, 24, 245113.

研究成果: Article › 査読

50 被引用数 (Scopus)

Distribution of solute atoms in β- and spinel Si _6-zAl _zO _zN _8-z by Al K-edge x-ray absorption near-edge structure

Tatsumi, K., Mizoguchi, T., Yoshioka, S., Yamamoto, T., Suga, T., Sekine, T. & Tanaka, I., 2005 1月, In: Physical Review B - Condensed Matter and Materials Physics. 71, 3, 033202.

研究成果: Article › 査読

39 被引用数 (Scopus)

General rule for displacive phase transitions in perovskite compounds revisited by first principles calculations

Tohei, T., Kuwabara, A., Yamamoto, T., Oba, F. & Tanaka, I., 2005 1月 28, In: Physical Review Letters. 94, 3, 035502.

研究成果: Article › 査読

39 被引用数 (Scopus)

Local environment of Mn dopant in ZnO by near-edge x-ray absorption fine structure analysis

Kunisu, M., Oba, F., Ikeno, H., Tanaka, I. & Yamamoto, T., 2005 3月 21, In: Applied Physics Letters. 86, 12, p. 1-3 3 p., 121902.

研究成果: Article › 査読

48 被引用数 (Scopus)

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