@article{CTT100926862,
  author = {Takehiro Koike and Hena Das and Kengo Oka and Yoshihiro Kusano and Fernando Cubillas and Francisco B.  Bojorqez and Victor Emmanuel  Alvarez-Montano and Shigekazu Ito and Kei Shigematsu and Hayato  Togano and Ikuya Yamada and Hiroki Ishibashi and Kubota Yoshiki and Shigeo Mori and Noboru  Kimizuka and Masaki Azuma},
  title = {Pressure-Induced YbFe2O4-Type to Spinel Structural Change of InGaMgO4},
  journal = {Solids},
  year = 2024,
}

@article{CTT100792726,
  author = {Takahiro Ogata and Kengo Oka and Masaki Azuma},
  title = {Negative thermal expansion in electron doped PbVO<sub>3</sub><sub>ー</sub><sub>x</sub>F<sub>x</sub>},
  journal = {Applied Physics Express},
  year = 2019,
}

@article{CTT100779654,
  author = {Hajime Hojo and Kengo Oka and Keisuke Shimizu and Hajime Yamamoto and Ryo Kawabe and Masak Azuma},
  title = {Development of Bismuth Ferrite as a Piezoelectric and Multiferroic Material by Cobalt Substitution},
  journal = {ADVANCED MATERIALS},
  year = 2018,
}

@article{CTT100779898,
  author = {Takumi Nishikubo and Yuki Sakai and Kengo Oka and Masaichiro Mizumaki and Tetsu Watanuki and Akihiko Machida and Naoyuki Maejima and Shigenori Ueda and Takashi Mizokawa and Masaki Azuma},
  title = {Optimized negative thermal expansion induced by gradual intermetallic charge transfer in Bi<sub>1</sub><sub>-</sub><sub>x</sub>Sb<sub>x</sub>NiO<sub>3</sub>},
  journal = {Applied physics express},
  year = 2018,
}

@article{CTT100760072,
  author = {M. Azuma and Y. Sakai and T. Nishikubo and M. Mizumaki and T. Watanuki and T. Mizokawa and K. Oka and H. Hojo and M. Naka},
  title = {Systematic charge distribution changes in Bi- and Pb-3d transition metal perovskites},
  journal = {Dalton Transactions},
  year = 2018,
}

@article{CTT100760071,
  author = {K.Oka and T.Yamauchi and S.Kanungo and T.Shimazu and K.Ohishi and Y. Uwatoko and M.Azuma and T.Saha-Dasgupta},
  title = {Experimental and Theoretical Studies of the Metallic Conductivity in Cubic PbVO<sub>3</sub> under High Pressure},
  journal = {JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN},
  year = 2018,
}

@article{CTT100760245,
  author = {Y. Okimoto and S. Naruse and R. Fukaya and T. Ishikawa and S. Koshihara and K. Oka and M. Azuma and K. Tanaka and H. Hirori},
  title = {Ultrafast Control of the Polarity of BiCoO<sub>3</sub> by Orbital Excitation as Investigated by Femtosecond Spectroscopy},
  journal = {Physical Review Applied},
  year = 2017,
}

@article{CTT100737204,
  author = {Yuki Sakai and Junye Yang and Runze Yu and Hajime Hojo and Ikuya Yamada and Ping Miao and Sanghyun Lee and Shuki Torii and Takashi Kamiyama and Marjana Ležaić and G.Bihlmayer and M. Mizumaki and J.Komiyama and T.Mizokawa and H.Yamamoto and T.Nishikubo and Y.Hattori and K. Oka and Y.Yin and J.Dai and W.Li and S.Ueda and A.Aimi and D.Mori and Y. Inaguma and Z.Hu and T. Uozumi and C.Jin and Y.Long and Masaki Azuma},
  title = {A-site and B-site charge orderings in an s-d level controlled perovskite oxide PbCoO<sub>3</sub>},
  journal = {Journal of the American Chemical Society},
  year = 2017,
}

@article{CTT100737199,
  author = {Mirza HK Rubel and Takahiro  Takei and Nobuhiro Kumada and M Mozahar Ali and Akira  Miura and Kiyoharu Tadanaga and Kengo Oka and Masaki Azuma and Eisuke Magome and Chikako Moriyoshi},
  title = {Hydrothermal Synthesis, Structure, and Superconductivity of Simple Cubic Perovskite (Ba<sub>0. 62</sub>K<sub>0. 38</sub>)(Bi<sub>0. 92</sub>Mg<sub>0. 08</sub>) O<sub>3</sub> with T<sub> c</sub>∼ 30 K},
  journal = {Inorganic Chemistry},
  year = 2017,
}

@article{CTT100737179,
  author = {Nakano Kiho and Oka Kengo and Watanuki Tetsu and Mizumaki Masaichiro and Machida  Akihiko and Agui Akane and Kim  Hyunjeong and Komiyama Jun and Mizokawa Takashi and Nishikubo Takumi and Masaki Azuma},
  title = {Glassy Distribution of Bi3+/Bi5+ in Bi1–x Pb x NiO3 and Negative Thermal Expansion Induced by Intermetallic Charge Transfer},
  journal = {Chemistry of Materials},
  year = 2016,
}

@article{CTT100737195,
  author = {Kengo Oka and Hajime Hojo and Masaki Azuma and Katsuyoshi Oh-ishi},
  title = {Temperature-Independent, Large Dielectric Constant Induced by Vacancy and Partial Anion Order in the Oxyfluoride Pyrochlore Pb<sub>2</sub>Ti<sub>2</sub>O<sub>6</sub>− <sub>δ</sub>F<sub>2</sub><sub>δ</sub>},
  journal = {Chemistry of Materials},
  year = 2016,
}

@article{CTT100711342,
  author = {Octavianti Naa and Nobuhiro Kumada and Akira Miura and Takahiro Takei and Masaki Azuma and Yoshihiro Kusano and Kengo Oka},
  title = {High-Pressure Polymorph of NaBiO<sub>3</sub>},
  journal = {Inorganic Chemistry},
  year = 2016,
}

@article{CTT100737184,
  author = {Naa Octavianti and Nobuhiro Kumada and Miura  Akira and Takahiro Takei and Masaki Azuma and Yoshihiro Kusano and Kengo Oka},
  title = {High-Pressure Polymorph of NaBiO3},
  journal = {Inorganic chemistry},
  year = 2016,
}

@article{CTT100711343,
  author = {Runze Yu and Narumi Matsuda and Ken Tominaga and Keisuke Shimizu and Hajime Hojo and Yuki Sakai and Hajime Yamamoto and Kengo Oka and Masaki Azuma},
  title = {High-Temperature Monoclinic Cc Phase with Reduced c/a Ratio in Bi-based Perovskite Compound Bi<sub>2</sub>ZnTi<sub>1</sub>−<sub>x</sub>Mn<sub>x</sub>O<sub>6</sub>},
  journal = {Inorganic Chemistry},
  year = 2016,
}

@article{CTT100711340,
  author = {Hajime Yamamoto and Takumi Kihara and Kengo Oka and Tokunaga Masashi and Ko Mibu and Masaki Azuma},
  title = {Spin Structure Change in Co-Substituted BiFeO<sub>3 </sub>},
  journal = {Journal of the Physical Society of Japan},
  year = 2016,
}

@article{CTT100702907,
  author = {Mirza H. K. Rubel and Takahiro  Takei and Nobuhiro  Kumada and M. Mozahar Ali and Akira Miura and Kiyoharu Tadanaga and Kengo Oka and Masaki Azuma and Masatomo  Yashima and Kotaro Fujii and Eisuke Magome and Chikako  Moriyoshi and Yoshihiro Kuroiwa and James R. Hester and Maxim Avdeev},
  title = {Hydrothermal Synthesis, Crystal Structure, and Superconductivity of a Double-Perovskite Bi Oxide},
  journal = {Chem Mater},
  year = 2016,
}

@article{CTT100702815,
  author = {Masaki Azuma and Kengo Oka and Koichiro Nabetani},
  title = {Negative thermal expansion induced by intermetallic charge transfer},
  journal = {Science and Technology of Advanced Materials},
  year = 2015,
}

@article{CTT100702814,
  author = {Runze Yu and Hajime Hojo and Tetsu Watanuki and Masaichiro Mizumaki and Takashi Mizokawa and Kengo Oka and Hyunjeong  Kim and Akihiko Machida and Kouji Sakaki and Yumiko Nakamura and Aguin Akane and Daisuke Mori and Yoshiyuki Inaguma and Martin Schlipf and Konstantin  Z. Rushchanskii and Marjana Lezaic and Masaaki Matsuda and Jie Ma and Stuart Calder and Masahiko Isobe and Yuichi Ikuhara and Masaki Azuma},
  title = {Melting of Pb Charge Glass and Simultaneous Pb−Cr Charge Transfer in PbCrO<sub>3 </sub> as the Origin of Volume Collapse},
  journal = {Journal of the American Chemical Society},
  year = 2015,
}

@article{CTT100702908,
  author = {Mirza  H.K. Rubel and Takahiro Takei and Nobuhiro Kumada and M.M. Ali and Akira Miura and Kiyoharu Tadanaga and K. Oka and M. Azuma and E. Magomae and C. Moriyoshi and Y. Kuroiwa},
  title = {Hydrothermal synthesis of a new  Bi-based (Ba<sub>0.82</sub>K<sub>0.18</sub>)(Bi<sub>0.53</sub>Pb<sub>0.47</sub>)O<sub>3</sub> superconductor},
  journal = {Journal of Alloys and Compounds},
  year = 2015,
}

@article{CTT100702817,
  author = {K. Nabetani and Y. Muramatsu and K. Oka and Kiho Nakano and H. Hojo and M. Mizumaki and A. Agui and Y.  Higo and N. Hayashi and M. Takano and M. Azuma},
  title = {Suppression of temperature hysteresis in negative thermal expansion compound BiNi1− x Fe x O3 and zero-thermal expansion composite},
  journal = {APPLIED PHYSICS LETTERS},
  year = 2015,
}

@article{CTT100702911,
  author = {N. Ishimatsu and T. Watanabe and K. Oka and M. Azuma and M. Mizumaki and K. Nitta and T. Ina and N. Kawamura},
  title = {Differences in local structure around Co and Fe of the BiCo<sub>1</sub>−<sub>x</sub> Fe<sub>x</sub> O<sub>3</sub> system determined by x-ray absorption fine structure},
  journal = {PHYSICAL REVIEW B},
  year = 2015,
}

@article{CTT100683610,
  author = {Sunseng Pyon and Kazutaka Kudo and Jun-ichi Matsumura and Hiroyuki Ishii and Genta Matsuo and Nohara Minoru and Hojo Hajime and Oka Kengo and Azuma Masaki and Garlea. V.  Ovidiu},
  title = {Superconductivity in Noncentrosymmetric Iridium Silicide Li2IrSi3},
  journal = {JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN},
  year = 2014,
}

@article{CTT100683778,
  author = {Kousuke Nishimura and Ikuya Yamada and Kengo Oka and Yuichi Shimakawa and Masaki Azuma},
  title = {High-pressure synthesis of BaVO3: A new cubic perovskite},
  journal = {JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS},
  year = 2014,
}

@article{CTT100683822,
  author = {Rubel Mirza H. K and Miura Akira and Takei Takahiro and Kumada Nobuhiro and Ali M. Mozahar and Nagao Masanori and Watauchi Satoshi and Tanaka Isao and Oka Kengo and Azuma Masaki and Magome Eisuke and Moriyoshi Chikako and Kuroiwa Yoshihiro and Islam A. K. M. Azharul},
  title = {Superconducting Double Perovskite Bismuth Oxide Prepared by a Low-Temperature Hydrothermal Reaction},
  journal = {ANGEWANDTE CHEMIE-INTERNATIONAL EDITION},
  year = 2014,
}

@article{CTT100668019,
  author = {奈部谷 光一郎 and 岡 研吾 and 東 正樹},
  title = {BiNi<sub>1</sub>−<sub>x</sub>Fe<sub>x</sub>O<sub>3 </sub>のサイト間電荷移動誘起負の熱膨張における温度履歴の抑制},
  journal = {粉体および粉末冶金},
  year = 2014,
}

@article{CTT100668026,
  author = {村松 裕也 and 奈部谷 光一郎 and 岡 研吾 and 東 正樹},
  title = {巨大な負の熱膨張を示すペロブスカイトBiNiO<sub>3</sub> を用いたゼロ熱膨張コンポジットの作製},
  journal = {粉体および粉末冶金},
  year = 2014,
}

@article{CTT100667939,
  author = {Romain  Gautier and Kengo Oka and Takumi Kihara and Nitesh Kumar and Athinarayanan Sundaresan and M  Tokunaga and Masaki Azuma and Kenneth R. Poeppelmeier},
  title = {Spin Frustration from cis-Edge or -Corner Sharing Metal-Centered Octahedra},
  journal = {Journal of the american chemical society},
  year = 2013,
}

@article{CTT100667930,
  author = {Izabela Sosnowska and Masaki Azuma and Radosław Przeniosło and Dariusz Wardecki and Wei-tin Chen and Kengo Oka and Yuichi Shimakawa},
  title = {Crystal and Magnetic Structure in Co-Substituted BiFeO<sub>3</sub>},
  journal = {Inorganic Chemistry},
  year = 2013,
}

@article{CTT100667810,
  author = {岡 研吾 and 東 正樹 and 森 茂生},
  title = {BiCo<sub>1</sub>–<sub>x</sub>Fe<sub>x</sub>O<sub>3</sub> の分極回転現象},
  journal = {日本結晶学会誌},
  year = 2013,
}

@article{CTT100669076,
  author = {Ikuya YAMADA and Kentaro  SHIRO and Kengo OKA and Masaki AZUMA and Tetsuo IRIFUNE},
  title = {Direct observation of negative thermal expansion in SrCu₃Fe₄O₁₂},
  journal = {Journal of the Ceramic Society of Japan},
  year = 2013,
}

@article{CTT100667931,
  author = {Makoto Kubota and Kengo Oka and Hisato Yabuta and Kaoru Miura and Masaki Azuma},
  title = {Structure and Magnetic Properties of BiFe<sub>1</sub>−<sub>x</sub>Co<sub>x</sub>O<sub>3 </sub>andBi<sub>0.9</sub>Sm<sub>0.1</sub>Fe<sub>1</sub>−<sub>x</sub>Co<sub>x</sub>O<sub>3</sub>},
  journal = {Inorganic Chemistry},
  year = 2013,
}

@article{CTT100668094,
  author = {Kengo Oka and Koichiro Nabetani and Chika Sakaguchi and Hayato Seki and Michel  Czapski and Yuichi Shimakawa and Masaki Azuma},
  title = {Tuning negative thermal expansion in Bi<sub>1</sub>-<sub>X</sub>Ln<sub>X</sub>NiO<sub>3</sub>(Ln=La,Nd,Eu,Dy)},
  journal = {APPLIED PHYSICS LETTERS},
  year = 2013,
}

@article{CTT100667804,
  author = {Kengo Oka and Masaichiro Mizumaki and Chika Sakaguchi and Alexandra  Sinclair and Clemens  Ritter and J. Paul Attfield and Masaki Azuma},
  title = {Intermetallic charge-transfer transition in Bi<sub>1</sub>−<sub>x</sub>La<sub>x</sub>NiO<sub>3</sub> as the origin of the colossal negative thermal expansion},
  journal = {PHYSICAL REVIEW B},
  year = 2013,
}

@article{CTT100645090,
  author = {Kengo Oka and Tsukasa koyama and Tomoatsu Ozaki and Yuichi Shimakawa and Masaki Azuma and Shigeo Mori},
  title = {Polarization Rotation in the Monoclinic  Perovskite  BiCo1_xFex03},
  journal = {Angewandte Chemie-International Edition},
  year = 2012,
}

@article{CTT100638994,
  author = {久保田 純 and 岡 研吾 and 中村 嘉孝 and 薮田 久人 and 三浦 薫 and 島川 祐一 and 東 正樹},
  title = {Sm置換BiFeO₃の相転移挙動},
  journal = {粉体および粉末冶金},
  year = 2012,
}

@article{CTT100639080,
  author = {N. Onishi and K. Oka and M. Azuma and Y. Shimakawa and Yukitoshi Motome and Toshifumi Taniguchi and M. Hiraishi and M. Miyazaki and Tetsuya Masuda and A. Koda and R. Kadono and Kenji Kojima},
  title = {Magnetic ground state of the frustrated honeycomb lattice antiferromagnet Bi3Mn4O12(NO3)},
  journal = {PHYSICAL REVIEW B},
  year = 2012,
}

@article{CTT100652588,
  author = {Yoshihiro Tsujimoto and Clastin I.  Sathish and Kun-Pyo Hong and Kengo Oka and Masaki Azuma and Yanfeng  Guo and Yoshitaka Matsushita and Kazunari Yamaura and Eiji Takayama-Muromachi},
  title = {Crystal Structural, Magnetic, and Transport Properties of Layered Cobalt Oxyfluorides, Sr2CoO3+xF1−x (0 ≤ x ≤ 0.15)},
  journal = {Inorganic Chemistry},
  year = 2012,
}

@article{CTT100631985,
  author = {Makoto Kubota and Kengo Oka and Yoshitaka Nakamura and Hisato Yabuta and Kaoru Miura and Yuichi Shimakawa and Masaki Azuma},
  title = {Sequential Phase Transitions in Sm Substituted BiFeO3},
  journal = {Jpn. J. Appl. Phys.},
  year = 2011,
}

@article{CTT100632254,
  author = {Watanabe Takayuki and Mikio Shimada and Toshiaki Aiba and Hisato Yabuta and Kaoru Miura and Kengo Oka and Masaki Azuma and Satoshi Wada and Nobuhiro Kumada},
  title = {Structural Transformation of Hexagonal (0001)BaTiO3 Ceramics to Tetragonal (111)BaTiO3 Ceramics},
  journal = {JAPANESE JOURNAL OF APPLIED PHYSICS},
  year = 2011,
}

@article{CTT100632241,
  author = {Sudayama, T and Y. Wakisaka and H.  Wadati and Mizokawa and G. A. Sawatzky and D.G. Hawthorn and T. Z. Regier and Kengo Oka and Masaki Azuma and M. Shimakawa, Y},
  title = {Co-O-O-Co superexchange pathways enhanced by small charge-transfer energy in multiferroic BiCoO(3)},
  journal = {Pysical Review B},
  year = 2011,
}

@article{CTT100631999,
  author = {Masaki Azuma and Wei-tin Chen and Hayato  seki and Michal  Czapski and Smirnova olga and Kengo oka and Masaichiro Mizumaki and Tetsu Watanuki and Naoki Ishimatsu and Naomi Kawamura and Shintaro Ishiwata and Matthew G. Tucker and Yuichi Shimakawa and J. Paul Attfield},
  title = {Colossal negative thermal expansion in BiNiO3 induced by intermetallic charge transfer},
  journal = {NATURE COMMUNICATIONS},
  year = 2011,
}

@article{CTT100617362,
  author = {Kengo Oka and Masaki Azuma and Wei-tin Chen and hitoshi Yusa and Alexei A. Belik and Eiji Takayama-Muromachi and Masaichiro Mizumaki and Naoki Ishimatsu and Nozomu Hiraoka and Masahiko Tsujimoto and Matthew G. Tucker and J. Paul Attfield and Yuichi Shimakawa},
  title = {Pressure-Induced Spin-State Transition in BiCoO3},
  journal = {JOURNAL OF THE AMERICAN CHEMICAL SOCIETY},
  year = 2010,
}

@article{CTT100617476,
  author = {Kengo Oka and Masaki Azuma and Alexei A. Belik and Hiroshi Kojitani and Masaki Akaogi and Mikio Takano and Yuichi Shimakawa},
  title = {Pressure-Induced Transformation of 6H Hexagonal to 3C Perovskite Structure in PbMnO3},
  journal = {Inorganic Chemistry},
  year = 2009,
}

@article{CTT100631729,
  author = {Long, Y.W. and T. Saito and T. Tohyama and K. Oka and M. Azuma and Y. Shimakawa},
  title = {Intermetallic Charge Transfer in A-Site-Ordered Double Perovskite BiCu3Fe4O12.},
  journal = {Inog. Chem.},
  year = 2009,
}

@article{CTT100633048,
  author = {Kohki Satoh and Masatoshi Hiraishi and Masanori Miyazaki and Satoshi Takeshita and Akihiro Koda and R. Kadono and I. Yamada and K. Oka and M. Azuma and Y. Shimakawa and M. Takano},
  title = {Effect of Zn substitution for Cu on Ca2-xNaxCuO2Cl2 near the hole concentration of 1/8 per Cu.},
  journal = {Physica B-Condensed Matter},
  year = 2009,
}

@article{CTT100631614,
  author = {H. Jiang and N. Kumada and Y. Yonesaki and T. Takei and N. Kinomura and M. Yashima and M. Azuma and K. Oka and Y. Shimakawa},
  title = {Hydrothermal Synthesis of a New Double Perovskite-Type Bismuthate, (Ba0.75K0.14H0.11)BiO3•nH2O},
  journal = {Jpn. J. Appl. Phys.},
  year = 2009,
}

@article{CTT100617473,
  author = {Kengo Oka and Masaki Azuma and Ikuya Yamada and Soshi Takeshita and Kohki Satoh and Akihiro Koda and Ryosuke Kadono and Mikio Takano and Yuichi Shimakawa},
  title = {Magnetic ground-state of perovskite PbVO3 with large tetragonal distortion},
  journal = {Inorganic Chemistry},
  year = 2008,
}

@article{CTT100617481,
  author = {Kengo Oka and Masaki Azuma and Naoaki Hayashi and Shigetoshi Muranaka and Yasuo Narumi and Koichi Kindo and Masatsune Kato and Yoji Koike and Yuichi Shimakawa and Mikio Takano},
  title = {Charge and magnetic orderings in the triangular-lattice antiferromagnet InFe2O4},
  journal = {Journal of the Physical Society of Japan},
  year = 2008,
}

@article{CTT100633338,
  author = {岡研吾 and 東正樹 and 鳴海康雄 and 金道浩一 and 林直顕 and 島川祐一 and 高野幹夫},
  title = {三角格子反強磁性体InFe2O4の合成と物性},
  journal = {粉体および粉末冶金},
  year = 2007,
}

@article{CTT100617483,
  author = {Kengo Oka and Siichiro Imamura},
  title = {Active state of tungsten oxides on WO3/ZrO2 catalyst for steam reforming of dimethyl ether combined with CuO/CeO2},
  journal = {Applied Catalysis A-General},
  year = 2006,
}

@inproceedings{CTT100723578,
  author = {松田奈瑠美 and 于 潤澤 and 北條 元 and 東 正樹 and 岡研吾},
  title = {適度な c/a 比を持つ単斜晶 ペロブスカイトBi<sub>2</sub>ZnTi<sub>1-x</sub>Mn<sub>x</sub>O<sub>6</sub>},
  booktitle = {},
  year = 2015,
}

@misc{CTT100792725,
  author = {東 正樹 and 岡 研吾 and 山本 孟 and 酒井 雄樹},
  title = {相転移型巨大負熱膨張物質},
  year = 2019,
}

@misc{CTT100652206,
  author = {東 正樹 and 岡 研吾},
  title = {ぺロブスカイトBiNiO₃におけるサイト間電荷移動と巨大負の熱膨張},
  year = 2012,
}

@misc{CTT100633990,
  author = {東正樹 and 岡研吾 and 辻本将彦 and 齊藤高志 and 磯田正二 and 島川祐一 and 高野幹夫 and 新高誠司 and Alexei Belik},
  title = {Bi, Pb-3d遷移金属ペロブスカイトの構造物性研究},
  year = 2007,
}

@misc{CTT100720895,
  author = {東正樹 and 岡研吾 and 坂口　智可 and 奈部谷光一郎 and 村松裕也},
  title = {負熱膨張性材料},
  howpublished = {登録特許},
  year = 2017,
  month  = {},
  note   = {特願2014-531487(2013/07/23), 再表2014/030293(2016/07/28), 特許第6143197号(2017/05/19)}
}