Average and local structural study of proton conductivity by complementary use of neutron and X-ray

• Project/Area Number: 24710100
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: KIYANAGI RYOJI 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 J-PARCセンター, 研究員 (50521770)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2014: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 中性子構造解析 / プロトン伝導体 / 中性子回折 / 結晶構造 / 超プロトン伝導体

Outline of Final Research Achievements

The purpose of this research is to elucidate the underlying mechanism of the super protonic conduction realized in solid acids. Solid solutions of the solid acids were selected as the target materials in order to precisely understand the relationship between the crystal structure and the super protonic conductivity. The conductivity measurements revealed that the phase transition temperature to the super protonic conductive phase non-linearly varies as the ratio of the solid solutions were changed. Meanwhile, the crystal structure analyses by the neutron diffraction method displayed that the distortion of SeO4 tetrahedrons changes as the ratio of the solid solutions changes. This variation was also non-linear to the ratio of the solid solution, suggesting the direct relationship to the phase transition temperature.

Research Products

• [Journal Article] Phase transition and internal crystal structure of superprotonic conductor, Rb3-xKxH(SeO4)2 (2015)
  • Author(s): Ryoji Kiyanagi, Yasumitsu Matsuo, Takshi Ohhara, Takuro Kawasaki, Kenichi Oikawa, Koji Kaneko, Itraru Tamura, Takayasu Hanashima, Koji Munakata, Akiko Nakao, Yukinobu Kawakita
  • Journal Title: JPS Conf. Proc. Volume: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Proton Conduction Path in Rb3H(SeO4)2 Studied by High Temperature Neutron Single Crystal Diffraction (2014)
  • Author(s): R. Kiyanagi, Y. Ishikawa, Y. Noda
  • Journal Title: JPS Conf. Proc. Volume: 1 Pages: 0120341-6
  • DOI: 10.7566/jpscp.1.012034
  • Peer Reviewed
• [Presentation] Proton conduction mechanism and phase transition of (Rb,K)3H(SeO4)2 (2014)
  • Author(s): Ryoji Kiyanagi, Yasumitsu Matsuo, Yoshihisa Ishikawa, Yukio Noda, Takashi Ohhara, Takuro Kawasaki, Kenichi Oikawa, Koji Kaneko, Itaru Tamura, Takayasu Hanashima, Koji Munakata, Akiko Nakao, Yukinobu Kawakita
  • Organizer: Congress and General Assembly of International Union of Crystallography
  • Place of Presentation: Montreal, Canada
  • Year and Date: 2014-08-05 – 2014-08-12
• [Presentation] Structural study of Solid solution of protonic conductors Rb3-xKxH(SeO4)2 by single crystal neutron diffraction (2013)
  • Author(s): Ryoji Kiyanagi, Yasumitsu Matsuo, Takashi Ohhara, Takuro Kawasaki, Kenichi Oikawa, Koji Kaneko, Itaru Tamura, Takayasu Hanashima, Koji Munakata, Akiko Nakao, Yukinobu Kawakita
  • Organizer: International Conference on Neutron Scattering
  • Place of Presentation: イギリス エディンバラ
• [Presentation] Proton conduction path in Rb3H(SeO4)2 studied by high temperature neutron single crystal diffraction (2013)
  • Author(s): R. Kiyanagi, Y. Ishikawa, Y. Noda
  • Organizer: The 12th Asia Pacific Physics Conference of AAPPS
  • Place of Presentation: 幕張
• [Presentation] 超プロトン伝導体Rb3-xKxH(SeO4)2の結晶構造と相転移 (2013)
  • Author(s): 鬼柳亮嗣，松尾康光、大原高志、川崎卓郎、及川建一、金子耕士、田村格良、中尾朗子、花島隆泰、宗像孝司、川北至信
  • Organizer: 平成25年度日本結晶学会年会
  • Place of Presentation: 熊本
• [Presentation] Relation between crystal structure and phase transition of protonic conductor, Rb3-xKxH(SeO4)2 (2013)
  • Author(s): Ryoji Kiyanagi, Yasumitsu Matsuo, Takashi Ohhara, Takuro Kawasaki, Kenichi Oikawa, Koji Kaneko, Itaru Tamura, Takayasu Hanashima, Koji Munakata, Akiko Nakao, Yukinobu Kawakita
  • Organizer: The 12th conference of the Asian Crystallographic Association
  • Place of Presentation: 中国 香港
• [Presentation] Structural study of solid solution of protonic conductors Rb3-xKxH(SeO4)2 by single crystal neutron diffraction (2013)
  • Author(s): Ryoji Kiyanagi, et. al.
  • Organizer: International Conference on Neutron Scattering
  • Place of Presentation: Edinburgh（英国）
• [Presentation] Proton conduction path in Rb3H(SeO4)2 studied by high temperature neutron single crystal diffraction (2013)
  • Author(s): Ryoji Kiyanagi, et. al.
  • Organizer: The 12th Asia Pacific Physics Conference
  • Place of Presentation: 千葉