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RESEARCH PAPER · Chemistry of Materials · 2016

Temperature-Independent, Large Dielectric Constant Induced by Vacancy and Partial Anion Order in the Oxyfluoride Pyrochlore Pb2Ti2O6−δF2δ

Kengo Oka, Hajime Hojo, Masaki Azuma, Katsuyoshi Oh‐ishi

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Temperature-Independent, Large Dielectric Constant Induced by Vacancy and Partial Anion Order in the Oxyfluoride Pyrochlore Pb2Ti2O6−δF2δOriginalChemInform Abstract: Temperature‐Independent, Large Dielectric Constant Induced by Vacancy and Partial Anion Order in the Oxyfluoride Pyrochlore Pb2Ti2O6‐δF2δ.0Physical characteristics of PbO−ZrO 2 −SiO 2 :TiO 2 glass ceramics embedded with Pb 2 Ti 2 O 6 cubic pyrochlore crystal phase: Part-I electrical properties23Synthetic approaches in oxynitride chemistry59A Stable, Narrow-Gap Oxyfluoride Photocatalyst for Visible-Light Hydrogen Evolution and Carbon Dioxide Reduction171Light Absorption Properties and Electronic Band Structures of Lead Titanium Oxyfluoride Photocatalysts Pb 2 Ti 4 O 9 F 2 and Pb 2 Ti 2 O 5.4 F 1.238Metal‐Complex/Semiconductor Hybrid Photocatalysts and Photoelectrodes for CO2 Reduction Driven by Visible Light280Covalency-driven Structural Evolution in the Polar Pyrochlore Series Cd2Nb2O7–xSx24Solar-Driven Photoelectrochemical Water Oxidation over an n-Type Lead–Titanium Oxyfluoride Anode51Oxyfluoride Pb2Ti4O9F2 as a Stable Anode Material for Photoelectrochemical Water Oxidation20Activation of a Pt-loaded Pb 2 Ti 2 O 5.4 F 1.2 photocatalyst by alkaline chloride treatment for improved H 2 evolution under visible light14Formation of breathing pyrochlore lattices: structural, thermodynamic and crystal chemical aspects33Synthesis of NaMoO3F and Na5W3O9F5 with Morphological Controllability in Non-Aqueous Solvents15Recent Progress in Mixed‐Anion Materials for Solar Fuel Production58A bifunctional lead–iron oxyfluoride, PbFeO 2 F, that functions as a visible-light-responsive photoanode and an electrocatalyst for water oxidation5New Visible‐Light‐Responsive Photocatalysts for Water Splitting Based on Mixed Anions1Dielectric constant of thin film graphitic carbon nitride (g-C3N4) and double dielectric Al2O3/g-C3N459Structural Diversity of Ordered Pyrochlores82Improvement of a Pb2Ti2O5.4F1.2 Photoanode for Solar Water Splitting by Refining the Cocatalyst and Electrolyte8Development of Sn2+-based oxyfluoride photocatalyst with visible light response of ca. 650 nm via strengthened hybridization of Sn 5s and O 2p orbitals20Electrochemical Crystal Growth of Titanium Oxyfluorides—A Strategy for Development of Electron-Doped Materials2Exploring novel functional properties arose from anion order in mixed anion compounds1Domain-wall freezing in Cd2Nb2O7 pyrochlore single crystal6Site preference of fluoride anion and potential ionic conductivity in fluorapatites A5(VO4)3F (A = Pb, Sr, and Ba)3An unusual O 2− /F − distribution in the new pyrochlore oxyfluorides: Na 2 B 2 O 5 F 2 (B = Nb, Ta)6Anionic ordering in Pb 2 Ti 4 O 9 F 2 revisited by nuclear magnetic resonance and density functional theory3Effect of different fabrication avenues of pyrochlore ceramics toward order–disorder transitions0Morphology controllable synthesis of GdOF nanocrystals and application in theranostic purpose3Designing new polar materials1Improvement of Visible‐Light H2 Evolution Activity of Pb2Ti2O5.4F1.2 Photocatalyst by Coloading of Rh and Pd Cocatalysts5Oxygen vacancy in GdOF: generation of reactive oxygen species under dark5Vacancy-Driven Disorder and Elevated Dielectric Response in the Pyrochlore Pb1.5Nb2O6.57New Pyrochlore-like Oxyfluorides Na2–2xSnxM2O5F2 (M = Nb5+ or Ta5+ and 1 ≤ x ≤ 0) as Potential Candidates for Overall Water Splitting Photocatalysis8Synthesis, crystal structure and photocatalytic studies of new oxyfluoride Cu5AsO5F516Cr and Mg codoped bismuth tantalate pyrochlores: Thermal expansion and stability, crystal structure, electrical and optical properties, NEXAFS and XPS study16Reduction of a Band Gap and Visible-Light Photocatalytic Activity Induced by the Interaction between 6s and 2p Orbitals known as Revised Lone Pair Model0Low-Temperature Microwave-Assisted Hydrothermal Synthesis of Pb2Ti2O5.4F1.2 Photocatalyst for Improved H2 Evolution under Visible Light16Photoelectrochemical Water Oxidation over Pb2Ti2O5.4F1.2 Photoanodes Prepared by the Particle Transfer Method5Structural modeling of oxygen-fluorine ordering in transition metal inorganic oxyfluorides0Rapid fluorination using polyvinylidene-difluoride (PVDF) for the synthesis of oxyfluoride Bi2VO5F1−x0Mesoporous Oxyhalide Aggregates Exhibiting Improved Photocatalytic Activity for Visible-Light H2 Evolution and CO2 Reduction7Lewis Acid–Base-Driven Anisotropic Crystal Growth of Pyrochlore Pb 2 Ti 2 O 5.4 F 1.2 with Enhanced Visible-Light H 2 Evolution Activity1Stabilizing Iodine in Pyrochlore: Toward New Nuclear Waste Forms1

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  1. ChemInform Abstract: Temperature‐Independent, Large Dielectric Constant Induced by Vacancy and Partial Anion Order in the Oxyfluoride Pyrochlore Pb2Ti2O6‐δF2δ.

    ChemInform · 2016-09-01

    Kengo Oka, Hajime Hojo, Masaki Azuma, Katsuyoshi Oh‐ishi

    Read original paper ↗ ·

  2. Physical characteristics of PbO−ZrO 2 −SiO 2 :TiO 2 glass ceramics embedded with Pb 2 Ti 2 O 6 cubic pyrochlore crystal phase: Part-I electrical properties

    Journal of Alloys and Compounds · 2017-04-14

    Addanki S Rao, Jujjavarapu Ashok, B. Suresh, G. Naga Raju, N. Venkatramaiah, Vandana Ravi Kumar, Ivan V. Kityk, N. Veeraiah

    Read original paper ↗ ·

  3. Synthetic approaches in oxynitride chemistry

    Progress in Solid State Chemistry · 2017-11-03

    Amparo Fuertes

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  4. A Stable, Narrow-Gap Oxyfluoride Photocatalyst for Visible-Light Hydrogen Evolution and Carbon Dioxide Reduction

    Journal of the American Chemical Society · 2018-05-07

    Ryo Kuriki, Tom Ichibha, Kenta Hongo, Daling Lu, Ryo Maezono, Hiroshi Kageyama, Osamu Ishitani, Kengo Oka, Kazuhiko Maeda

    Read original paper ↗ ·

  5. Light Absorption Properties and Electronic Band Structures of Lead Titanium Oxyfluoride Photocatalysts Pb 2 Ti 4 O 9 F 2 and Pb 2 Ti 2 O 5.4 F 1.2

    The Journal of Physical Chemistry C · 2018-10-29

    Haruki Wakayama, Keishu Utimula, Tom Ichibha, Ryo Kuriki, Kenta Hongo, Ryo Maezono, Kengo Oka, Kazuhiko Maeda

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  6. Metal‐Complex/Semiconductor Hybrid Photocatalysts and Photoelectrodes for CO2 Reduction Driven by Visible Light

    Advanced Materials · 2019-05-08

    Kazuhiko Maeda

    Read original paper ↗ ·

  7. Covalency-driven Structural Evolution in the Polar Pyrochlore Series Cd2Nb2O7–xSx

    Chemistry of Materials · 2019-08-27

    Geneva Laurita, Daniel Hickox-Young, Samra Husremovic, Jun Li, A.W. Sleight, Robin T. Macaluso, James M. Rondinelli, Mas A. Subramanian

    Read original paper ↗ ·

  8. Solar-Driven Photoelectrochemical Water Oxidation over an n-Type Lead–Titanium Oxyfluoride Anode

    Journal of the American Chemical Society · 2019-10-05

    Naoki Hirayama, Hiroko Nakata, Haruki Wakayama, Shunta Nishioka, Tomoki Kanazawa, Ryutaro Kamata, Yosuke Ebato, Kosaku Kato, Hiromu Kumagai, Akira Yamakata, Kengo Oka, Kazuhiko Maeda

    Read original paper ↗ ·

  9. Oxyfluoride Pb2Ti4O9F2 as a Stable Anode Material for Photoelectrochemical Water Oxidation

    The Journal of Physical Chemistry C · 2019-12-31

    Kazuhiko Maeda, Naoki Hirayama, Hiroko Nakata, Haruki Wakayama, Kengo Oka

    Read original paper ↗ ·

  10. Activation of a Pt-loaded Pb 2 Ti 2 O 5.4 F 1.2 photocatalyst by alkaline chloride treatment for improved H 2 evolution under visible light

    Journal of Materials Chemistry A · 2020-01-01

    Haruki Wakayama, Kosaku Kato, Kodai Kashihara, Tomoki Uchiyama, Akinobu Miyoshi, Hiroko Nakata, Daling Lu, Kengo Oka, Akira Yamakata, Yoshiharu Uchimoto, Kazuhiko Maeda

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  11. Formation of breathing pyrochlore lattices: structural, thermodynamic and crystal chemical aspects

    CrystEngComm · 2020-01-01

    Mikhail V. Talanov, Valeriy M. Talanov

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  12. Synthesis of NaMoO3F and Na5W3O9F5 with Morphological Controllability in Non-Aqueous Solvents

    Inorganic Chemistry · 2020-07-21

    Yusuke Asakura, Tomoyo Akahira, Makoto Kobayashi, Minoru Osada, Shu Yin

    Read original paper ↗ ·

  13. Recent Progress in Mixed‐Anion Materials for Solar Fuel Production

    Solar RRL · 2020-10-24

    Akinobu Miyoshi, Kazuhiko Maeda

    Read original paper ↗ ·

  14. A bifunctional lead–iron oxyfluoride, PbFeO 2 F, that functions as a visible-light-responsive photoanode and an electrocatalyst for water oxidation

    RSC Advances · 2021-01-01

    Ryusuke Mizuochi, Kazunari Izumi, Yoshiyuki Inaguma, Kazuhiko Maeda

    Read original paper ↗ ·

  15. New Visible‐Light‐Responsive Photocatalysts for Water Splitting Based on Mixed Anions

    Unknown journal · 2021-02-26

    Kazuhiko Maeda

    Read original paper ↗ ·

  16. Dielectric constant of thin film graphitic carbon nitride (g-C3N4) and double dielectric Al2O3/g-C3N4

    Applied Physics Letters · 2021-03-08

    Purna Chandra Patra, Y. N. Mohapatra

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  17. Structural Diversity of Ordered Pyrochlores

    Chemistry of Materials · 2021-04-09

    Mikhail V. Talanov, Valeriy M. Talanov

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  18. Improvement of a Pb2Ti2O5.4F1.2 Photoanode for Solar Water Splitting by Refining the Cocatalyst and Electrolyte

    Bulletin of the Chemical Society of Japan · 2021-05-14

    Kazuhiko Maeda, Naoki Hirayama, Hiroko Nakata, Kengo Oka

    Read original paper ↗ ·

  19. Development of Sn2+-based oxyfluoride photocatalyst with visible light response of ca. 650 nm via strengthened hybridization of Sn 5s and O 2p orbitals

    Journal of Energy Chemistry · 2021-08-09

    Yanpei Luo, Xin Zhou, Jiangwei Zhang, Yu Qi, Zheng Li, Fuxiang Zhang, Can Li

    Read original paper ↗ ·

  20. Electrochemical Crystal Growth of Titanium Oxyfluorides—A Strategy for Development of Electron-Doped Materials

    Inorganic Chemistry · 2021-08-31

    Yusuke Chiba, Kengo Shibata, Hiroshi Takatsu, Kotaro Fujii, Miwa Saito, Hiroshi Kageyama, Kazuhiko Maeda, Masatomo Yashima, Teruki Motohashi

    Read original paper ↗ ·

  21. Exploring novel functional properties arose from anion order in mixed anion compounds

    Journal of the Ceramic Society of Japan · 2021-08-31

    Kengo Oka

    Read original paper ↗ ·

  22. Domain-wall freezing in Cd2Nb2O7 pyrochlore single crystal

    Materials Research Bulletin · 2021-09-09

    Mikhail V. Talanov, Aleksey A. Pavelko, Liudmila S. Kamzina

    Read original paper ↗ ·

  23. Site preference of fluoride anion and potential ionic conductivity in fluorapatites A5(VO4)3F (A = Pb, Sr, and Ba)

    Journal of the Ceramic Society of Japan · 2021-12-31

    Kengo Oka, Wataru Nishiki, Miho Takasu, Naoki Noma, Mitsunobu Iwasaki

    Read original paper ↗ ·

  24. An unusual O 2− /F − distribution in the new pyrochlore oxyfluorides: Na 2 B 2 O 5 F 2 (B = Nb, Ta)

    Chemical Communications · 2022-01-01

    Édouard Boivin, Frédérique Pourpoint, Sébastien Saitzek, Pardis Simon, Pascal Roussel, Houria Kabbour

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  25. Anionic ordering in Pb 2 Ti 4 O 9 F 2 revisited by nuclear magnetic resonance and density functional theory

    Dalton Transactions · 2022-01-01

    Kengo Oka, Tom Ichibha, Daichi Kato, Yasuto Noda, Yusuke Tominaga, Kosei Yamada, Mitsunobu Iwasaki, Naoki Noma, Kenta Hongo, Ryo Maezono, Fernando Agustín Reboredo

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  26. Effect of different fabrication avenues of pyrochlore ceramics toward order–disorder transitions

    Elsevier eBooks · 2022-01-01

    Gordon James Thorogood, Shirley Chang, Sarah C. Finkeldei

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  27. Morphology controllable synthesis of GdOF nanocrystals and application in theranostic purpose

    Materials Today Proceedings · 2022-01-01

    Tanmoy Mondal, Nibedita Haldar, Biplab Kumar Paul, Chandan Kumar Ghosh

    Read original paper ↗ ·

  28. Designing new polar materials

    Elsevier eBooks · 2022-01-28

    Emma E. McCabe

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  29. Improvement of Visible‐Light H2 Evolution Activity of Pb2Ti2O5.4F1.2 Photocatalyst by Coloading of Rh and Pd Cocatalysts

    Chemistry - A European Journal · 2022-05-27

    Kenta Aihara, Kosaku Kato, Tomoki Uchiyama, Shuhei Yasuda, Toshiyuki Yokoi, Akira Yamakata, Yoshiharu Uchimoto, Kazuhiko Maeda

    Read original paper ↗ ·

  30. Oxygen vacancy in GdOF: generation of reactive oxygen species under dark

    Applied Physics A · 2022-07-20

    Tanmoy Mondal, Nibedita Haldar, Dheeraj Mondal, Chandan Kumar Ghosh

    Read original paper ↗ ·

  31. Vacancy-Driven Disorder and Elevated Dielectric Response in the Pyrochlore Pb1.5Nb2O6.5

    Inorganic Chemistry · 2022-11-08

    Uyen T. Dang, Jake O’Hara, Hayden A. Evans, Daniel Olds, Juan R. Chamorro, Daniel Hickox-Young, Geneva Laurita, Robin T. Macaluso

    Read original paper ↗ ·

  32. New Pyrochlore-like Oxyfluorides Na2–2xSnxM2O5F2 (M = Nb5+ or Ta5+ and 1 ≤ x ≤ 0) as Potential Candidates for Overall Water Splitting Photocatalysis

    Chemistry of Materials · 2022-12-29

    Édouard Boivin, Sébastien Saitzek, François Fauth, Marielle Huvé, Pascal Roussel, Houria Kabbour

    Read original paper ↗ ·

  33. Synthesis, crystal structure and photocatalytic studies of new oxyfluoride Cu5AsO5F5

    Journal of Molecular Structure · 2023-04-17

    Bibaswan Sen, Sayantani Paul, Sangita Das, Asoke Prasun Chattopadhyay, S. Ali

    Read original paper ↗ ·

  34. Cr and Mg codoped bismuth tantalate pyrochlores: Thermal expansion and stability, crystal structure, electrical and optical properties, NEXAFS and XPS study

    Journal of Solid State Chemistry · 2023-04-26

    Nadezhda A. Zhuk, Maria Georgievna Krzhizhanovskaya, Aleksandra V. Koroleva, Artem A. Selyutin, Nikolay A. Sekushin, Sergey V. Nekipelov, Danil V. Sivkov, Vladislav V. Kharton

    Read original paper ↗ ·

  35. Reduction of a Band Gap and Visible-Light Photocatalytic Activity Induced by the Interaction between 6s and 2p Orbitals known as Revised Lone Pair Model

    Journal of the Japan Society of Colour Material · 2023-05-20

    Kengo Oka, Naoki Noma, Mitsunobu Iwasaki

    Read original paper ↗ ·

  36. Low-Temperature Microwave-Assisted Hydrothermal Synthesis of Pb2Ti2O5.4F1.2 Photocatalyst for Improved H2 Evolution under Visible Light

    ACS Materials Letters · 2023-08-02

    Kenta Aihara, Ryusuke Mizuochi, Megumi Okazaki, Shunta Nishioka, Shuhei Yasuda, Toshiyuki Yokoi, Fumitaka Ishiwari, Akinori Saeki, Miki Inada, Kazuhiko Maeda

    Read original paper ↗ ·

  37. Photoelectrochemical Water Oxidation over Pb2Ti2O5.4F1.2 Photoanodes Prepared by the Particle Transfer Method

    The Journal of Physical Chemistry C · 2023-10-31

    Ryusuke Mizuochi, Naoki Hirayama, Kazuhiko Maeda

    Read original paper ↗ ·

  38. Structural modeling of oxygen-fluorine ordering in transition metal inorganic oxyfluorides

    Unknown journal · 2023-12-08

    Ouail Zakary

    Read original paper ↗ ·

  39. Rapid fluorination using polyvinylidene-difluoride (PVDF) for the synthesis of oxyfluoride Bi2VO5F1−x

    Journal of the Ceramic Society of Japan · 2025-05-31

    Kengo Oka, Hideo Mizutani, Ibuki Sumitani, Joichiro Murasaki, Naoki Noma, Mitsunobu Iwasaki

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  40. Mesoporous Oxyhalide Aggregates Exhibiting Improved Photocatalytic Activity for Visible-Light H2 Evolution and CO2 Reduction

    ACS Catalysis · 2025-07-09

    Hiroto Ueki, Toshiya Tanaka, Shuji Anabuki, Ryuichi Nakada, Megumi Okazaki, Kenta Aihara, Masashi Hattori, Fumitaka Ishiwari, Rie Haruki, Shunsuke Nozawa, Toshiyuki Yokoi, Masahiko Hara, Osamu Ishitani, Akinori Saeki, Akira Yamakata, Kazuhiko Maeda

    Read original paper ↗ ·

  41. Lewis Acid–Base-Driven Anisotropic Crystal Growth of Pyrochlore Pb 2 Ti 2 O 5.4 F 1.2 with Enhanced Visible-Light H 2 Evolution Activity

    Chemistry of Materials · 2026-02-06

    Gentoku Kido, Hiroto Ueki, Megumi Okazaki, Jun Kikkawa, Koji Kimoto, Ryosuke Nishikubo, Akinori Saeki Saeki, Kazuhiko Maeda

    Read original paper ↗ ·

  42. Stabilizing Iodine in Pyrochlore: Toward New Nuclear Waste Forms

    Precision Chemistry · 2026-06-09

    Xiao Xu, Guangshuai Han, Tianhao Li, Jiayue Hu, Guotao Qiu, Shao-Yu Tseng, Gyeong Ho Han, Alexander D. Dupuy, Anthony Shoji Hall, Corey Oses

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