Structural frustration effects by mixed alkali ions in ferroelectric Dion–Jacobson layered perovskites (Cs,Rb)NdNb2O7
Zhen-Tao Lu; Sota Asaki; Suguru Yoshida; Chikako Moriyoshi; George Hasegawa; Koji Fujita; Venkatraman Gopalan; Katsuro Hayashi; Hirofumi Akamatsu
Journal of Materials Chemistry C, 2025年
Suppression of Ferroelectric Transitions by Symmetry Trapping in Dion–Jacobson-Layered Perovskites Cs(La,Nd)Nb2O7
Zhen-Tao Lu; Kai Nishioka; Yang Zhang; Koji Fujita; Katsuro Hayashi; Hirofumi Akamatsu
Inorganic Chemistry, 2024年12月16日
Morphological control and strong light scattering in macroporous TiO 2 monoliths prepared via a colloid-derived sol–gel route
Koji Fujita
Science and Technology of Advanced Materials, 2016年
Low-temperature growth of highly crystallized FeTiO3-Fe2O3 solid solution thin films with smooth surface morphology
Koji Fujita
Journal of Physics: Conference Series, 2010年
Epitaxial growth of ferrimagnetic semiconductor 0.4Fe3O4•0.6Fe2TiO4 solid solution thin films on MgO(100) substrates
Koji Fujita
Journal of Physics: Conference Series, 2010年
Phase separation in Al2O3 sol-gel system incorporated with high molecular weight poly(ethylene oxide)
Koji Fujita
Materials Research Society Symposium - Proceedings, 2008年
Room-temperature photochemical hole burning of Eu3+-doped glasses
K Fujita; M Nishi; K Hirao
RARE-EARTH-DOPED MATERIALS AND DEVICES V, 2001年, 査読有り
多孔質酸化鉄薄膜における局在表面プラズモン共鳴と結合したファラデー効果の増強
村井 俊介; 荒谷 誠; 藤田 晃司; 田中 勝久
粉体および粉末冶金, 2015年01月01日, 査読有り
Anionic Sublattices in Halide Solid Electrolytes: A Case Study with the High-Pressure Phase of Li3ScCl6
FH Ding; A Doi; T Ogawa; H Ubukata; T Zhu; D Kato; C Tassel; I Oikawa; N Inui; S Kuze; T Yamabayashi; K Fujii; M Yashima; X Ou; ZJ Wang; XB Min; K Fujita; H Takamura; A Kuwabara; TR Zhang; KJ Griffith; Z Lin; LY Chai; H Kageyama
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2024年04月
Thermal multiferroics in all-inorganic quasi-two-dimensional halide perovskites
T Zhu; XZ Lu; T Aoyama; K Fujita; Y Nambu; T Saito; H Takatsu; T Kawasaki; T Terauchi; S Kurosawa; A Yamaji; HB Li; C Tassel; K Ohgushi; JM Rondinelli; H Kageyama
Bi12O17Cl2 with a Sextuple Bi-O Layer Composed of Rock-Salt and Fluorite Units and its Structural Conversion through Fluorination to Enhance Photocatalytic Activity
Daichi Kato; Osamu Tomita; Ryky Nelson; Maria A. Kirsanova; Richard Dronskowski; Hajime Suzuki; Chengchao Zhong; Cedric Tassel; Kohdai Ishida; Yosuke Matsuzaki; Craig M. Brown; Koji Fujita; Kotaro Fujii; Masatomo Yashima; Yoji Kobayashi; Akinori Saeki; Itaru Oikawa; Hitoshi Takamura; Ryu Abe; Hiroshi Kageyama; Tatiana E. Gorelik; Artem M. Abakumov
ADVANCED FUNCTIONAL MATERIALS, 2022年08月, 査読有り
Interplay between Oxygen Octahedral Rotation and Deformation in the Acentric ARTiO(4) Series toward Negative Thermal Expansion
Suguru Yoshida; Hirofumi Akamatsu; Alexandra S. Gibbs; Shogo Kawaguchi; Venkatraman Gopalan; Katsuhisa Tanaka; Koji Fujita
CHEMISTRY OF MATERIALS, 2022年07月, 査読有り
PbBi3O4X3 (X = Cl, Br) with Single/Double Halogen Layers as a Photocatalyst for Visible-Light-Driven Water Splitting: Impact of a Halogen Layer on the Band Structure and Stability
Journal of the American Chemical Society, 2021年10月27日
Structural origin of thermal shrinkage in soda-lime silicate glass below the glass transition temperature: A theoretical investigation by microsecond timescale molecular dynamics simulations
Hybrid Improper Ferroelectricity in (Sr,Ca)(3)Sn2O7 and Beyond: Universal Relationship between Ferroelectric Transition Temperature and Tolerance Factor in n=2 Ruddlesden-Popper Phases
Suguru Yoshida; Hirofumi Akamatsu; Ryosuke Tsuji; Olivier Hernandez; Haricharan Padmanabhan; Arnab Sen Gupta; Alexandra S. Gibbs; Ko Mibu; Shunsuke Murai; James M. Rondinelli; Venkatraman Gopalan; Katsuhisa Tanaka; Koji Fujita
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2018年11月, 査読有り
Demonstration of temperature-plateau superheated liquid by photothermal conversion of plasmonic titanium nitride nanostructures
Satoshi Ishii; Ryosuke Kamakura; Hiroyuki Sakamoto; Thang D. Dao; Satish L. Shinde; Tadaaki Nagao; Koji Fujita; Kyoko Namura; Motofumi Suzuki; Shunsuke Murai; Katsuhisa Tanaka
NANOSCALE, 2018年10月, 査読有り
Enhanced Photoluminescence from Organic Dyes Coupled to Periodic Array of Zirconium Nitride Nanoparticles
Ryosuke Kamakura; Shunsuke Murai; Koji Fujita; Katsuhisa Tanaka
ACS PHOTONICS, 2018年08月, 査読有り
Ferroelectric Sr3Zr2O7: Competition between Hybrid Improper Ferroelectric and Antiferroelectric Mechanisms
Suguru Yoshida; Koji Fujita; Hirofumi Akamatsu; Olivier Hernandez; Arnab Sen Gupta; Forrest G. Brown; Haricharan Padmanabhan; Alexandra S. Gibbs; Toshihiro Kuge; Ryosuke Tsuji; Shunsuke Murai; James M. Rondinelli; Venkatraman Gopalan; Katsuhisa Tanaka
ADVANCED FUNCTIONAL MATERIALS, 2018年07月
Surface-Enhanced Infrared Absorption for the Periodic Array of Indium Tin Oxide and Gold Microdiscs: Effect of in-Plane Light Diffraction
Ryosuke Kamakura; Tomoki Takeishi; Shunsuke Murai; Koji Fujita; Katsuhisa Tanaka
ACS PHOTONICS, 2018年07月
Collective plasmonic modes excited in Al nanocylinder arrays in the UV spectral region
Directional outcoupling of photoluminescence from Eu(III)-complex thin films by plasmonic array
S. Murai; M. Saito; H. Sakamoto; M. Yamamoto; R. Kamakura; T. Nakanishi; K. Fujita; M. A. Verschuuren; Y. Hasegawa; K. Tanaka
APL PHOTONICS, 2017年02月, 査読有り
Preparation of Nb-doped anatase type TiO2 epitaxial thin films and excitation of surface plasmon polaritons
Shunsuke Murai; Ryosuke Kamakura; Koji Fujita; Yohei Daido; Katsuhisa Tanaka
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 2017年01月01日, 査読有り
Faraday effect of polycrystalline bismuth iron garnet thin film prepared by mist chemical vapor deposition method
Situ Yao; Ryosuke Kamakura; Shunsuke Murai; Koji Fujita; Katsuhisa Tanaka
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2017年01月, 査読有り
Competing Structural Instabilities in the Ruddlesden Popper Derivatives HRTiO4 (R = Rare Earths): Oxygen Octahedral Rotations Inducing Noncentrosymmetricity and Layer Sliding Retaining Centrosymmetricity
Arnab Sen Gupta; Hirofumi Akamatsu; Forrest G. Brown; Minh An T. Nguyen; Megan E. Strayer; Saul Lapidus; Suguru Yoshida; Koji Fujita; Katsuhisa Tanaka; Isao Tanaka; Thomas E. Mallouk; Venkatrarnan Gopalan
CHEMISTRY OF MATERIALS, 2017年01月, 査読有り
Instability of spin glass phase in divalent iron phosphate glass under a magnetic field
Yuko Nakatsuka; Shunsuke Murai; Koji Fujita; Katsuhisa Tanaka
JOURNAL OF PHYSICS-CONDENSED MATTER, 2017年01月, 査読有り
Effect of Cylinder Height on Directional Photoluminescence from Highly Luminous Thin Films on Periodic Plasmonic Arrays
Mesoporous silica layer on plasmonic array: light trapping in a layer with a variable index of refraction
Shunsuke Murai; Hiroyuki Sakamoto; Koji Fujita; Katsuhisa Tanaka
OPTICAL MATERIALS EXPRESS, 2016年09月, 査読有り
LiNbO3-Type InFeO3: Room-Temperature Polar Magnet without Second-Order Jahn-Teller Active Ions
Koji Fujita; Takahiro Kawamoto; Ikuya Yamada; Olivier Hernandez; Naoaki Hayashi; Hirofumi Akamatsu; William Lafargue-Dit-Hauret; Xavier Rocquefelte; Masafumi Fukuzumi; Pascal Manuel; Andrew J. Studer; Christopher S. Knee; Katsuhisa Tanaka
レーザー研究 = The review of laser engineering : レーザー学会誌, 2016年01月, 査読有り
Improper Inversion Symmetry Breaking and Piezoelectricity through Oxygen Octahedral Rotations in Layered Perovskite Family, LiRTiO4 (R = Rare Earths)
Arnab Sen Gupta; Hirofumi Akamatsu; Megan E. Strayer; Shiming Lei; Toshihiro Kuge; Koji Fujita; Clarina dela Cruz; Atsushi Togo; Isao Tanaka; Katsuhisa Tanaka; Thomas E. Mallouk; Venkatraman Gopalan
ADVANCED ELECTRONIC MATERIALS, 2016年01月, 査読有り
Excitation of Surface Plasmon Polaritons on Titanium Nitride Thin Films through Energy Transfer from Dye Molecules
Shunsuke Murai; Yohei Daido; Ryosuke Kamakura; Koji Fujita; Katsuhisa Tanaka
2016 IEEE 16TH INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (IEEE-NANO), 2016年, 査読有り
Optical Characterization and Emission Properties of Periodic Arrays of Titanium Nitride Nanoparticles
Ryosuke Kamakura; Shunsuke Murai; Koji Fujita; Katsuhisa Tanaka
2016 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS), 2016年, 査読有り
A labile hydride strategy for the synthesis of heavily nitridized BaTiO3
Takeshi Yajima; Fumitaka Takeiri; Kohei Aidzu; Hirofumi Akamatsu; Koji Fujita; Wataru Yoshimune; Masatoshi Ohkura; Shiming Lei; Venkatraman Gopalan; Katsuhisa Tanaka; Craig M. Brown; Mark A. Green; Takafumi Yamamoto; Yoji Kobayashi; Hiroshi Kageyama
NATURE CHEMISTRY, 2015年12月, 査読有り
Terbium Oxide, Fluoride, and Oxyfluoride Nanoparticles with Magneto-optical Properties
Akira Kawashima; Takayuki Nakanishi; Yuichi Kitagawa; Koji Fujita; Katsuhisa Tanaka; Koji Fushimi; Mohammad A. Malik; Paul O'Brien; Yasuchika Hasegawa
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 2015年10月, 査読有り
Electrical Properties of Epitaxial Thin Films of Oxyhydrides ATiO(3-x)H(x) (A = Ba and Sr)
Plasmonics: Metal-Dielectric Core-Shell Nanoparticles: Advanced Plasmonic Architectures Towards Multiple Control of Random Lasers (Advanced Optical Materials 8/2013)
Xiangeng Meng; Koji Fujita; Yusuke Moriguchi; Yanhua Zong; Katsuhisa Tanaka
Advanced Optical Materials, 2013年08月, 査読有り
Ferromagnetic amorphous oxides in the EuO-TiO2 system studied by the Faraday effect in the visible region and the x-ray magnetic circular dichroism at the Eu M-4,M-5 and L-2,L-3 edges
Tuning the wavelength of amplified spontaneous emission coupled to localized surface plasmon
S. Murai; Y. Tokuda; K. Fujita; K. Tanaka
APPLIED PHYSICS LETTERS, 2012年07月, 査読有り
Crystal and Electronic Structure and Magnetic Properties of Divalent Europium Perovskite Oxides EuMO3 (M = Ti, Zr, and Hf): Experimental and First-Principles Approaches
Hirofumi Akamatsu; Koji Fujita; Hiroyuki Hayashi; Takahiro Kawamoto; Yu Kumagai; Yanhua Zong; Koji Iwata; Fumiyasu Oba; Isao Tanaka; Katsuhisa Tanaka
INORGANIC CHEMISTRY, 2012年04月, 査読有り
Local Structure of Amorphous EuO-TiO2 Thin Films Probed by X-Ray Absorption Fine Structure
Crystalline ZrO2 monoliths with well-defined macropores and mesostructured skeletons prepared by combining the alkoxy-derived sol-gel process accompanied by phase separation and the solvothermal process
Junko Konishi; Koji Fujita; Satoshi Oiwa; Kazuki Nakanishi; Kazuyuki Hirao
Formation of interconnected macropores in Sm2+-doped silicate glasses through phase separation: Fabrication of photosensitive and dielectrically disordered materials
Photoinduced valence changes of samarium ions inside a silica-based glass with near-infrared femtosecond-laser pulses: Materials for three-dimensional optical memory
K Fujita; K Hirao
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2001年03月, 査読有り
Expanding the Structural Diversity of Anion-Based Solid Solutions(アニオン性固溶体における構造多様性の拡大)
新井 一功, 工学研究科, 副査
2025年03月24日
Study on characterization of rutile-type oxide semiconductor thin films toward next-generation power devices(次世代パワーデバイス応用に向けたルチル型酸化物半導体薄膜の特性評価に関する研究)
高根 倫史, 工学研究科, 副査
2025年03月24日
Local structural modification by femtosecond laser pulses and light manipulation by dielectric metasurface hologram(フェムト秒レーザーによる局所構造改質と誘電体メタサーフェスホログラムによる光操作)
Yang Yang, 工学研究科, 副査
2025年01月23日
Synthesis, Structure and Electronic Properties of Transition Metal Oxynitrides(遷移金属酸窒化物の合成、構造と電子物性)
石田 耕大, 工学研究科, 副査
2024年03月25日
Control of optical properties in periodic nanoparticle arrays based on metallurgical approaches(冶金的アプローチに基づく周期ナノ粒子アレイにおける光学特性の制御)
東野 真, 工学研究科, 副査
2024年03月25日
Studies on structural relaxation of silicate glasses below glass transition temperature(ガラス転移点以下におけるシリケートガラスの構造緩和に関する研究)
濱田 裕也, 工学研究科, 副査
2023年09月25日
Synthesis and Magnetism of Low-dimensional Compounds by Mixed Anion Strategy(複合アニオン戦略による合成と磁性)
松本 勇輝, 工学研究科, 副査
2023年03月23日
Fabrications and optical properties of loss-reduced silicon metasurfaces for luminescence enhancement(発光増強のための損失低減シリコンメタサーフェスの作製と光学特性)
LIU LIBEI, 工学研究科, 副査
2023年03月23日
Studies on chemical valence speciation analyses of trace sulfur and tin in glass(ガラス中の微量の硫黄とスズの価数の化学分析に関する研究)
西條 佳孝, 工学研究科, 副査
2022年09月26日
Anion Engineering on Functional Antiperovskites:From Solid-state Electrolytes to Polar Materials(アニオン視点による逆ペロブスカイトの機能開拓:固体電解質から極性物質まで)
GAO SHENGHAN, 工学研究科, 副査
2022年09月26日
Design of Bi-based layered oxyhalide photocatalysts for efficient solar-to-chemical conversion (高効率太陽光エネルギー変換に向けたBi系層状酸ハロゲン化物光触媒の設計)
小川 幹太, 工学研究科, 副査
2022年03月23日
Internal modification and functionality control of transparent materials by femtosecond laser irradiation (フェムト秒レーザー照射による透明材料内部改質および機能制御)
栗田 寅太郎, 工学研究科, 副査
2021年05月24日
Synthesis and Physical Properties of Low-Dimensional Pnictides(新規低次元ニクタイドの合成と物性)
村上 泰斗, 副査
2019年03月25日
Investigation on Piezoelectric Properties Reflecting Hierarchical Organization of Cyclic Peptide Nanotubes(圧電特性に現れる環状ペプチドナノチューブの階層構成に関する研究)
田畑 有基, 副査
2019年03月25日
Design of rare-earth-doped inorganic phosphors and luminescence enhancement by plasmonic effects(希土類添加無機蛍光体の設計とプラズモンの効果によるルミネセンスの増強)
GAO, YUAN, 副査
2020年03月23日
Preparation and magnetic properties of layered rare-earth ferrites(層状希土類フェライトの作製と磁気的性質)
KIM YOUJIN, 副査
2020年09月23日
Crystal and band structure control of layered oxyhalide photocatalysts(層状酸ハロゲン化物光触媒の結晶構造・バンド構造制御)
加藤 大地, 副査
2020年11月24日
Design and Synthesis of Bismuth-based Layered Oxychloride Photocatalysts for Visible-Light-Driven Water Splitting(可視光水分解のためのビスマス系層状酸塩化物光触媒の設計と合成)