Publications

A Systematic Evaluation of the Role of the Lanthanide Elements in Complex Functional Oxides; Implications for Energy Conversion Devices
Ji Wu, Kotaro Fujii, Masatomo Yashima, Aleksandar Staykov, Taner Akbay, Tatsumi Ishihara, John A. Kilner
J. Mater. Chem. A, 2018, 6(25), 11819-11829.

Undoped Layered Perovskite Oxynitride Li2LaTa2O6N for Photocata-lytic CO2 Reduction with Visible Light
Takayoshi Oshima, Tom Ichibha, Ken Sinkou Qin, Kanemichi Muraoka, Junie Jhon M. Vequizo, Keisuke Hibino, Ryo Kuriki, Shunsuke Yamashita, Kenta Hongo, Tomoki Uchiyama, Kotaro Fujii, Daling Lu, Ryo Maezono, Akira Yamakata, Hideki Kato, Koji Kimoto, Masatomo Yashi-ma, Yoshiharu Uchimoto, Masato Kakihana, Osamu Ishitani, Hiroshi Kageyama, Kazuhiko Maeda
Angew. Chem. Int. Ed., 2018, 57(27), 8154-8158.

A new structure family of oxide-ion conductor Ca0.8Y2.4Sn0.8O6 discovered by a combined technique of the bond-valence method and experiments
Ryota Inoue, Kotaro Fujii, Masahiro Shiraiwa, Eiki Niwa, Masatomo Yashima
Dalton Trans., 2018, 47(22), 7515-7521.

High oxide-ion conductivity by the overbonded channel oxygens in Si-deficient La9.565(Si5.8260.174)O26 apatite without interstitial oxygens
Kotaro Fujii, Masatomo Yashima, Keisuke Hibino, Masahiro Shiraiwa, Koichiro Fukuda, Susumu Nakayama, Nobuo Ishizawa, Takayasu Hanashima, Takashi Ohhara
J. Mater. Chem. A, 2018, 6(23), 10835-10846.

Redshift and thermal quenching of Ce3+ emission in (Gd,Y)3(Al, Si)5(O, N)12 oxynitride garnet phosphors
Kazuki Asami, Jumpei Ueda, Masahiro Shiraiwa, Kotaro Fujii, Masatomo Yashima, Setsuhisa Tanabe
Opt. Mater., in press.

Experimental visualization of oxide-ion diffusion paths in pyrochlore-type Yb2Ti2O7
Wataru Uno, Kotaro Fujii, Eiki Niwa, Shuki Torii, Ping Miao, Takashi Kamiyama, Masatomo Yashima
J. Ceram. Soc. Jpn., 2018, 126(5), 341-345.

Crystal structure and electrical conductivity of BaR2ZnO5 (R = Sm, Gd, Dy, Ho, and Er) – A new structure family of oxide-ion conductors
Keigo Nakamura, Kotaro Fujii, Eiki Niwa, Masatomo Yashima
J. Ceram. Soc. Jpn., 2018, 126(5), 292-299.

Synthesis, Crystal Structure and Optical Properties of New Layered Perovskite Scandium Oxychlorides: Sr2ScO3Cl, Sr3Sc2O5Cl2, and Ba3Sc2O5Cl2
Yu Su, Yoshihiro Tsujimoto, Kotaro Fujii, Makoto Tatsuta, Kengo Oka, Masatomo Yashima, Hiraku Ogino, Kazunari Yamaura
Inorg. Chem., 2018, 57(9), 5615-5623.

A New Precursor Route Using a Compositionally Flexible Layered Oxide and Nanosheet for Improved Nitrogen Doping and Photocatalytic Activity
Kazuhiko Maeda, Yuki Tokunaga, Keisuke Hibino, Kotaro Fujii, Miharu Eguchi, Shintaro Ida, Masatomo Yashima
ACS Appl. Energy Mater., 2018, 1(4), 1734-1741.

High pressure synthesis of hydride-fluoride pyrochlore NaCaMg2F7–xHx
Kazunari Arai, Yoji Kobayashi, Ya Tang, Yusuke Tsutsui, Daisuke Sakamaki, Takafumi Yamamoto, Kotaro Fujii, Masatomo Yashima, Shu Seki, Hiroshi Kageyama
Chem. Lett., 2018, 47(7), 829-832.

Single crystal growth of Sillén–Aurivillius perovskite oxyhalides Bi4NbO8X (X = Cl, Br)
Chengchao Zhong, Fumitaka Takeiri, Daichi Kato, Kotaro Fujii, Masatomo Yashima, Yasuhiro Fujii, Akitoshi Koreeda, Cédric Tassel, Ryu Abe, Hiroshi Kageyama
Inorganics, 2018, 6(2), 41.

A Quasi-two-dimensional metallic behavior in BaVO3–xHx (0.3 ≤ x ≤ 0.9) with Face- and Corner-sharing Octahedra
Takafumi Yamamoto, Kazuki Shitara, Shunsaku Kitagawa, Akihide Kuwabara, Masahiro Kuroe, Kenji Ishida, Masayuki Ochi, Kazuhiko Kuroki, Kotaro Fujii, Masatomo Yashima, Craig M. Brown, Hiroshi Takatsu, Tassel Cedric, Hiroshi Kageyama
Chem. Mater, 2018, 30(5), 1566-1574.

Weak ferromagnetic ordering in brownmillerite Ca2Fe2O5 and its effect on electric field gradients
Isao Kagomiya, Yuki Hirota, Ken-ichi Kakimoto, Kotaro Fujii, Masahiro Shiraiwa, Masatomo Yashima, Akio Fuwa, Shin Nakamura
Phys. Chem. Chem. Phys., 2017, 19(46), 31194-31201.

Crystal Structure, Electron Density and Characterization of Visible-Light Responsive Photocatalysts, (BaTaO2N)1−x(SrWO2N)x Solid Solutions
Keisuke Hibino, Masatomo Yashima, Takayoshi Oshima, Kotaro Fujii, Kazuhiko Maeda
Dalton Trans., 2017, 46(43), 14947-14956.

Crystal Structure and Oxide-Ion Conductivity of Ba1+xNd1−xInO4−x/2
Masahiro Shiraiwa, Kotaro Fujii, Yuichi Esaki, Su Jae Kim, Seongsu Lee, Masatomo Yashima
J. Electrochem. Soc., 2017, 164(13), F1392-F1399.

Crystal-structure and electron-density analyses of the perovskite-type oxynitrides BaNbO2N and SrNbO2N through synchrotron X-ray powder diffraction
Kotaro Fujii, Kazuho Shimada, Masatomo Yashima
J. Ceram. Soc. Jpn., 2017, 125(11), 808-810.

New Oxide-Ion Conductor SrYbInO4 with Partially Cation-Disordered CaFe2O4-Type Structure
Ayaka Fujimoto, Masatomo Yashima, Kotaro Fujii, James R. Hester
J. Phys. Chem. C, 2017, 121(39), 2172-21280.

Synthesis, Structure and Photoluminescence of a Novel Oxynitride BaYSi2O5N Activated by Eu2+ and Ce3+
Makoto Kobayashi, Takuya Yasunaga, Hironori Sato, Hideki Kato, Kotaro Fujii, Masatomo Yashima, Masato Kakihana
Chemistry Letters, 2017, 46(6), 795-797.

Control of the reversibility during boronic ester formation: application to the construction of ferrocene dimers and trimers
Kosuke Ono, Yohei Tohyama, Tatsuhiro Uchikura, Yuji Kikuchi, Kotaro Fujii, Hidehiro Uekusa and Nobuharu Iwasawa
Dalton Trans., 2017, 46(7), 2370-2376.

Hydrothermal Synthesis, Crystal Structure, and Superconductivity of a Double-Perovskite Bi Oxide
Mirza H. K. Rubel, Takahiro Takei, Nobuhiro Kumada, M. Mozahar Ali, Akira Miura, Kiyoharu Tadanaga, Kengo Oka, Masaki Azuma, Masatomo Yashima, Kotaro Fujii, Eisuke Magome, Chikako Moriyoshi, Yoshihiro Kuroiwa, James R. Hester, and Maxim Avdeev
Chem. Mater., 2016, 28(2), 459–465.

Improved oxide-ion conductivity of NdBaInO4 by Sr doping
Kotaro Fujii, Masahiro Shiraiwa, Yuichi Esaki, Masatomo Yashima, Su Jae Kim, Seongsu Lee
J. Mater. Chem. A, 2015, 3(22), 11985-11990.

Structure Determination from Powder X-ray Diffraction Data of Black Azo (Hydrazone) Pigments
Junji Otani, Michio Matsumura, Kotaro Fujii, Hidehiro Uekusa
Chem. Lett., 2015, 44(5), 662-664.

Structural Origin of the Anisotropic and Isotropic Thermal Expansion of K2NiF4-Type LaSrAlO4 and Sr2TiO4
Keishi Kawamura, Masatomo Yashima, Kotaro Fujii, Kazuki Omoto, Keisuke Hibino, Shuntaro Yamada, James R. Hester, Maxim Avdeev, Ping Miao, Shuki Torii, Takashi Kamiyama
Inorg. Chem., 2015, 54(8), 3896-3904.

新しい層状構造を有する酸化物イオン伝導体の発見
八島正知, 藤井孝太郎
パリティ, 2015, 30(1), 19-21.

Defect induced sodium disorder and ionic conduction mechanism in Na1.82Mg1.09P2O7
Guandong Liu, Shin-ichi Nishimura, Sai Cheong Chung, Kotaro Fujii, Masatomo Yashima, Atsuo Yamada
J. Mat. Chem. A, 2014, 2(43), 18353-18359.

酸化物イオン伝導体の新構造ファミリーNdBaInO4を発見
藤井孝太郎, 八島正知
パリティ, 2014, 29(9), 35-39.

新構造ファミリーの酸化物イオン伝導性材料を発見
藤井 孝太郎,八島 正知
セラミックス, 2014, 49(7), 615.

New Perovskite-Related Structure Family of Oxide-Ion Conducting Materials NdBaInO4
Kotaro Fujii, Yuichi Esaki, Kazuki Omoto, Masatomo Yashima, Akinori Hoshikawa, Toru Ishigaki, James R. Hester
Chem. Mat., 2014, 26(8), 2488-2491.

Diffusion Path and Conduction Mechanism of Protons in Hydroxyapatite
Masatomo Yashima, Naoyuki Kubo, Kazuki Omoto, Hirotaka Fujimori, Kotaro Fujii, Kenji Ohoyama
J. Phys. Chem. C, 2014, 118(10), 5180-5187.

Structural understanding of solid-state photodimerization reactions of cinnamic amide derivatives in terms of reaction cavities – color developer for thermosensitive paper
Satoshi Kodama, Kohei Johmoto, Akiko Sekine, Kotaro Fujii, Hidehiro Uekusa
CrystEngComm, 2013, 15(23), 4667-4675.

Experimental visualization of the Bi–O covalency in ferroelectric bismuth ferrite (BiFeO3) by synchrotron X-ray powder diffraction analysis
Kotaro Fujii, Hiroki Kato, Kazuki Omoto, Masatomo Yashima, Jun Chen, Xianran Xing
Phys. Chem. Chem. Phys., 2013, 15(18), 6779-6782.

Solid-State Hydration/Dehydration of Erythromycin A Investigated by ab Initio Powder X-ray Diffraction Analysis: Stoichiometric and Nonstoichiometric Dehydrated Hydrate
Kotaro Fujii, Masahide Aoki, Hidehiro Uekusa
Crystal Growth & Design, 2013, 13(5), 2060–2066.

Reversible Solid State Redox of an Octacyanometallate-Bridged Coordination Polymer by Electrochemical Ion Insertion/Extraction
Masashi Okubo, Koichi Kagesawa, Yoshifumi Mizuno, Daisuke Asakura, Eiji Hosono, Tetsuichi Kudo, Haoshen Zhou, Kotaro Fujii, Hidehiro Uekusa, Shin-ichi Nishimura, Atsuo Yamada, Atsushi Okazawa, Norimichi Kojima
Inorg. Chem., 2013, 52(7), 3772-3779.

Mechanism of Dehydration-Hydration Processes of Lisinopril Dihydrate Investigated by ab Initio Powder X-ray Diffraction Analysis
Kotaro Fujii, Hidehiro Uekusa, Naoko Itoda, Etsuo Yonemochi, Katsuhide Terada
Crystal Growth & Design, 2012, 12(12), 6165-6172.

Cocrystallization and amorphization induced by drug-excipient interaction improves the physical properties of acyclovir
Takaaki Masuda, Yasuo Yoshihashi, Etsuo Yonemochi, Kotaro Fujii, Hidehiro Uekusa, Katsuhide Terada
Int. J. Pharm., 2012, 422(1-2), 160-169.

Guest-induced self-assembly of a macrocyclic boronic ester containing diarylethene units: enhancement of photoresponsivity
Nobuharu Iwasawa, Hiroki Takahagi, Kosuke Ono, Kotaro Fujii, Hidehiro Uekusa
Chem. Comm., 2012, 48(60), 7477-7479.

Structure Determination from Powder X-ray Diffraction Data of a New Polymorph of a High-Density Organic Hydrate Material, with an Assessment of Hydrogen-Bond Disorder by Rietveld Refinement
Gin Keat Lim, Kotaro Fujii, Kenneth D. M Harris, David C. Apperley
Crystal Growth & Design, 2011, 11(12), 5192-5199.

Reversible Color Switching of an Organic Crystal Induced by Organic Solvent Vapors
Kotaro Fujii, Aya Sakon, Akiko Sekine, Hidehiro Uekusa
Crystal Growth & Design, 2011, 11(10), 4305-4308.

連載企画 有機粉末構造解析をはじめよう! 「試料準備から測定まで」
藤井 孝太郎、植草 秀裕
日本結晶学会誌, 2011, 53(3), 170-177.

連載企画 有機粉末構造解析をはじめよう! 「粉末未知結晶構造解析の紹介」
植草 秀裕、藤井 孝太郎
日本結晶学会誌, 2011, 53(3), 163-170.

Cooperativity in Solid-State Squaramides
Rafel Prohens, Anna Portell, Cristina Puigjaner, Salvador Tomas, Kotaro Fujii, Kenneth D. M. Harris, Xavier Alcobe, Merce Font-Bardia, Rafael Barbas
Cryst. Growth Des., 2011, 11(9), 3725-3730.

Supramolecular Networks in Crystalline Inclusion Complexes Formed from a New Host: 2,2-Bis, 4-hydroxy-3-phenylphenyl-1H-indene-1,3, 2H-dione
Kenta Kasugai, Suzumi Hashimoto, Kazunori Imai, Aya Sakon, Kotaro Fujii, Hidehiro Uekusa, Naoto Hayashi, Keiji Kobayashi
Cryst. Growth & Des., 2011, 11(9), 4044-4052.

Structural Chemistry of a New Chiral Anhydrous Phase of Ru, bipy3, ClO4 2 Established from Powder X-ray Diffraction Analysis
Eugene Y. Cheung, Kotaro Fujii, Fang Guo, Kenneth D. M. Harris, Sayoko Hasebe, Reiko Kuroda
Cryst. Growth Des., 2011, 11(8), 3313-3317.

Potential of synchrotron X-ray powder diffractometry for detection and quantification of small amounts of crystalline drug substances in pharmaceutical tablets
Hiroyuki Yamada, Katsuhiko Masuda, Takayuki Ishige, Kotaro Fujii, Hidehiro Uekusa, Keiko Miura, Etsuo Yonemochi, Katsuhide Terada
Journal of Pharmaceutical and Biomedical Analysis, 2011, 56(2), 448-453.

Exploiting powder X-ray diffraction for direct structure determination in structural biology: The P2X4 receptor trafficking motif YEQGL
Kotaro Fujii, Mark T. Young, Kenneth D.M. Harris
J. Struct. Biol., 2011, 174(3), 461-467.

Metastable polymorphic form of isopropylbenzophenone derivative directly obtained by the solid-state photoreaction investigated by ab initio powder X-ray diffraction analysis
Kotaro Fujii, Hidehiro Uekusa, Michitaro Fukano,Hideko Koshima
CrystEngComm, 2011, 13(3), 3197-3201.

粉末結晶解析を用いた溶媒蒸気による多形転移現象の解析
藤井孝太郎、植草 秀裕
化学工業, 2011, 64(4), 262-268.

In situ observation and mechanistic elucidation of metastable colored species in crystalline state photochromism of trans-biindenylidenedione
Kotaro Fujii, Kumiko Aruga, Akiko Sekine, Hidehiro Uekusa, Katsuya Sohno, Koichi Tanaka
CrystEngComm, 2011, 13(3), 731-733.

Study of the Pseudo-Crystalline Transformation from Form I to Form II of Thiamine Hydrochloride , Vitamin B1
Katsuhiko Masuda, Takayuki Ishige, Hiroyuki Yamada, Kotaro Fujii, Hidehiro Uekusa, Keiko Miura, Etsuo Yonemochi, Katsuhide Terada
Chem. Pharm. Bull., 2011, 59(1), 57-62.

Cocrystalline phase transformation of binary mixture of trimethoprim and sulfamethoxazole by slurry technique
Erizal Zaini, Yeyet C. Sumirtapura, Sundani N. Soewandhi, Auzal Halim, Hidehiro Uekusa, Kotaro Fujii
Asian Journal of Pharmaceutical and Clinical Research, 2010, 3(4), 26-29.

Direct structure elucidation by powder X-ray diffraction of a metal-organic framework material prepared by solvent-free grinding
Kotaro Fujii, Ana Lazuen Garay, Janeen Hill, Elena Sbircea, Zhigang Pan, Mingcan Xu, David C. Apperley, Stuart L. James, Kenneth D. M. Harris
Chem. Comm., 2010, 46(40), 7572-7574.

Potassium clavulanate
Kotaro Fujii, Kazuyuki Toyota, Akiko Sekine, Hidehiro Uekusa, Ilma Nugrahani, Sukmadjaja Asyarie, N. Sundani Soewandhi, Slamet Ibrahim
Acta Cryst., 2010, E66(8), m985-m986.

Arrays of P=O Dipoles As a Recurrent Structural Motif in Bis-Diphenylphosphine Oxides, Established from Powder X-ray Diffraction
Gin Keat Lim, Zhongfu Zhou, Kotaro Fujii, Patrizia Calcagno, Emilio Tedesco, Simon J. Kitchin, Benson M. Kariuki, Douglas Philp, Kenneth D. M Harris
Cryst. Growth Des., 2010, 10(8), 3814-3818.

A Solid-State Dehydration Process in an Organic Material Associated with Substantial Hydrogen-Bond Reorganization, Investigated by Powder X-ray Diffraction
Javier Marti-Rujas, Anabel Morte-Rodenas, Fang Guo, Nigel Thomas, Kotaro Fujii, Benson M. Kariuki, Kenneth D. M Harris
Cryst. Growth Des., 2010, 10(7), 3176-3181.

Selective transformation pathways between crystalline forms of an organic material established from powder X-ray diffraction analysis
Kotaro Fujii, Yasunari Ashida, Hidehiro Uekusa, Fang Guo, Kenneth D. M. Harris
Chem. Commun., 2010, 46(24), 4264-4266.

Hexaradialenes by Successive Ring Openings of Tris, alkoxytricyclobutabenzenes: Synthesis and Characterization
Shinya Shinozaki, Toshiyuki Hamura, Yousuke Ibusuki, Kotaro Fujii, Hidehiro Uekusa, Keisuke Suzuki
Angew. Chem. Int. Ed., 2010, 49(1), 3026-3029.

Physicochemical Understanding of Polymorphism and Solid-State Dehydration/Rehydration Processes for the Pharmaceutical Material Acrinol, by Ab Initio Powder X-ray Diffraction Analysis and Other Techniques
Kotaro Fujii, Hidehiro Uekusa, Naoko Itoda, Gen Hasegawa, Etsuo Yonemochi, Katsuhide Terada, Zhigang Pan, Kenneth D. M. Harris
J. Phys. Chem. C, 2010, 114(1), 580-586.

Partial ferromagnetic ordering and indirect exchange interaction in the spatially anisotropic kagome antiferromagnet Cs2Cu3CeF12
T. Amemiya, M. Yano, K. Morita, I. Umegaki, T. Ono, H. Tanaka, K. Fujii, H Uekusa
Phys. Rev. B, 2009, 80(10), 100406/1-100406/4.

Dihydrochalcone Designed from Methylophiopogonanone B Strongly Inhibits Hypoxia-inducible Factor , HIF-1α Activity
Mikio Fujii, Kiyoshi Egawa, Yasuaki Hirai, Masato Kondo, Kotaro Fujii, Hidehiro Uekusa, Hiroyuki Akita, Kiyoshi Nose, Kazuo Toriizuka, Yoshiteru Ida
Heterocycles, 2009, 78(8), 2061-2065.

Magnetic susceptibilities in a family of S = 1/2 kagome antiferromagnets
T. Ono, K. Morita, M. Yano, H. Tanaka, K. Fujii, H. Uekusa, Y. Narumi, K Kindo
Phys. Rev. B, 2009, 79(17), 174407/1-174407/11.

Chiral Tetraazamacrocycles Having Four Pendant-Arms
Seiji Kamioka, Takashi Takahashi, Susumu Kawauchi, Hiroaki Adachi, Yusuke Mori, Kotaro Fujii, Hidehiro Uekusa, Takayuki Doi
Org. Lett., 2009, 11(11), 2289-2292.

Performance of the micro-PIC gaseous area detector in small-angle X-ray scattering experiments.
Kaori Hattori, Ken'ichi Tsuchiya, Kazuki Ito, Yoko Okada, Kotaro Fujii, Hidetoshi Kubo, Kentaro Miuchi, Masaki Takata, Toru Tanimori, Hidehiro Uekusa
J. Synch. Rad., 2009, 16(2), 231-236.

Reevaluation of solubility of tolbutamide and polymorphic transformation from Form I to unknown crystal form
Gen Hasegawa, Takao Komasaka, Rui Bando, Yasuo Yoshihashi, Etsuo Yonemochi, Kotaro Fujii, Hidehiro Uekusa, Katsuhide Terada
Int. J. Pharm., 2009, 369(1-2), 12-18.

Vapor Induced Crystalline Transformation Investigated by ab initio Powder X-ray Diffraction Analysis.
Kotaro Fujii, Yasunari Ashida, Hidehiro Uekusa, Shinya Hirano, Shinji Toyota, Fumio Toda, Zhigang Pan, Kenneth D. M. Harris
Cryst. Growth & Des., 2009, 9(2), 1201-1207.

粉末X線結晶構造解析で解明する5-メチル-2-ピリドン共結晶の光反応性と転移現象
藤井 孝太郎, 植草 秀裕
日本結晶学会誌, 2008, 50(6), 335-340.

Singlet ground state and spin gap in S = 1/2 Kagome antiferromagnet Rb2Cu3SnF12.
Katsuhiro Morita, Midori Yano, Toshio Ono, Hidekazu Tanaka, Kotaro Fujii, Hidehiro Uekusa, Yasuo Narumi, Koichi Kindo
J. Phys. Soc. Jpn., 2008, 77(4), 043707/1-043707/4.

Single-crystal-to-single-crystal photocyclization of 4-, 2,4,6-triisopropylbenzoylbenzoic acid in the salt crystal with , S-phenylethylamine.
Hideko Koshima, Yuya Ide, Michitaro Fukano, Kotaro Fujii, Hidehiro Uekusa
Tetrahedron Lett., 2008, 49(28), 4346-4348.

粉末X線回折データを用いる有機化合物の結晶構造解析
津江 広人,堀口 雅弘,田村 類,藤井 孝太郎,植草 秀裕
有機合成化学協会誌, 2007, 65(12), 1203-1212.

Multiple pentafluorophenylation of 2,2,3,3,5,6,6-heptafluoro-3,6-dihydro-2H-1,4-oxazine with an organosilicon reagent: NMR and DFT structural analysis of oligo, perfluoroaryl compounds.
Masakazu Nishida, Haruhiko Fukaya, Yoshio Hayakawa, Taizo Ono, Kotaro Fujii, Hidehiro Uekusa
Helv. Chim. Acta, 2006, 89(11), 2671-2685.

Solid-state phase transition of an inclusion complex of 5-methyl-2-pyridone with 1,3,5-benzenetricarboxylic acid.
Shinya Hirano, Shinji Toyota, Fumio Toda, Kotaro Fujii, Hidehiro Uekuasa
Angew. Chem. Int. Ed., 2006, 45(36), 6013-6016.