Optimum cation doping for grain boundary design and practical applications of oxyapatite ionic conductors

• Project/Area Number: 15K05649
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Inorganic industrial materials
• Research Institution: University of Hyogo
• Principal Investigator: MINESHIGE Atsushi 兵庫県立大学, 工学研究科, 准教授 (00285339)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 酸素過剰型酸化物 / 酸化物イオン伝導体 / 粒界 / 燃料電池 / イオン伝導体 / アパタイト

Outline of Final Research Achievements

Effect of small amounts of Al or Fe-doping on conducting properties for La-excess-type lanthanum silicate was investigated. In case of high-temperature (1973 K) sintering for preparation, a grain interior resistance could be minimized. It is probably due to increase in oxygen interstitial concentration as charge carriers. In addition, there is a difference in a grain boundary resistances for Al and Fe-doping specimens, and it is revealed that Fe-doping system with optimum doping level had smaller grain boundary resistance compared with Al-doping one with the same doping level. By using X-ray diffraction measurements with synchrotron radiation microbeam at BL24XU, SPring-8, it was found that large grain boundary resistance in case of Al-doping was due to chemically unstable phase formation. On the other hand, in the case of Fe-doping, disappearance of the phase resulted in stabilization in grain boundary structure with reducing grain boundary resistance.

Research Products

• [Journal Article] Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability (2018)
  • Author(s): Mineshige Atsushi、Hayakawa Hikaru、Nishimoto Takuma、Heguri Akie、Yazawa Tetsuo、Takayama Yuki、Kagoshima Yasushi、Takano Hidekazu、Takeda Shingo、Matsui Junji
  • Journal Title: Solid State Ionics Volume: 319 Pages: 223-227
  • DOI: 10.1016/j.ssi.2018.02.002
  • Peer Reviewed
• [Presentation] Oxygen-Excess-Type Solid Electrolyte Based on Lanthanum Silicate (2017)
  • Author(s): A. Mineshige, H. Xiao, H. Hayakawa, M. Kobayashi, T. Nishimoto, A. Heguri, A. Saito, T.Yazawa, and H. Yoshioka
  • Organizer: 21st International Conference on Solid State Ionics
  • Int'l Joint Research
• [Presentation] Fuel Cell Performance of Lanthanum Silicate Electrolyte Thin Films (2017)
  • Author(s): M. Kobayashi, A. Mineshige, A. Saito, T. Yazawa, H. Yoshioka, T. Ishihara, M. Sakao, and R. Mori
  • Organizer: 21st International Conference on Solid State Ionics
  • Int'l Joint Research
• [Presentation] Preparation of Lanthanum Silicate Electrolyte with High Conductivity and High Chemical Stability (2017)
  • Author(s): H. Hayakawa, A. Mineshige, T. Nishimoto, A. Heguri, T. Yazawa, Y. Takayama, Y. Kagoshima, H. Takano, S. Takeda, and J. Matsui
  • Organizer: 21st International Conference on Solid State Ionics
  • Int'l Joint Research
• [Presentation] Oxygen Reduction Reaction for Lanthanum Silicate-Based Electrolyte Cells (2017)
  • Author(s): M. Kobayashi, A. Mineshige, and T. Yazawa
  • Organizer: International Union of Materials Research Societies - The 15th International Conference on Advanced Materials (IUMRS-ICAM2017)
  • Int'l Joint Research
• [Presentation] Preparation of Highly Conductive Lanthanum Silicate Solid Electrolyte with High Chemical Stability (2017)
  • Author(s): H. Hayakawa, A. Mineshige, and T. Yazawa
  • Organizer: ,International Union of Materials Research Societies - The 15th International Conference on Advanced Materials (IUMRS-ICAM2017),2017,2017,,1
  • Int'l Joint Research
• [Presentation] Oxygen-excess-type ionic conducting thin film for fuel cell application (2016)
  • Author(s): A. Mineshige, M. Kobayashi, A. Saito, H. Yoshioka, R. Mori, and T. Yazawa
  • Organizer: 230th Electrochemical Society Meeting (PRiME2016)
  • Place of Presentation: Honolulu, HI, USA
  • Year and Date: 2016-10-02
  • Int'l Joint Research
• [Presentation] ランタンシリケート系電解質の正極界面抵抗の評価 (2016)
  • Author(s): 小林 美緒, 嶺重 温, 斉藤 篤史, 丹下 実香, 矢澤 哲夫, 吉岡 秀樹
  • Organizer: 電気化学会第83回大会
  • Place of Presentation: 大阪大学吹田キャンパス（大阪府吹田市山田丘2-1）
  • Year and Date: 2016-03-29
• [Presentation] ランタンシリケート系電解質の粒界構造観察 (2016)
  • Author(s): 早川 光, 嶺重 温, 西本 琢磨, 平郡 章絵, 矢澤 哲夫, 篭島 靖, 高野 秀和, 竹田 晋, 吉岡 秀樹
  • Organizer: 電気化学会第83回大会
  • Place of Presentation: 大阪大学吹田キャンパス（大阪府吹田市山田丘2-1）
  • Year and Date: 2016-03-29
• [Presentation] Electrical properties of lanthanum silicate-based oxygen-excess-type ionic conductors (2016)
  • Author(s): A. Mineshige, T. Nishimoto, A. Heguri, H. Hayakawa, and T. Yazawa
  • Organizer: Electronic Materials and Applications 2016 (American Ceramic Society Meeting)
  • Place of Presentation: Orlando, FL USA
  • Year and Date: 2016-01-20
  • Int'l Joint Research
• [Presentation] Electrical properties of perovskite-related cobaltites/ferrites mixed conductors (2016)
  • Author(s): M. Tange, A. Mineshige, and T. Yazawa
  • Organizer: Electronic Materials and Applications 2016 (American Ceramic Society Meeting)
  • Place of Presentation: Orlando, FL USA
  • Year and Date: 2016-01-20
  • Int'l Joint Research
• [Presentation] 鉄不純物添加による燃料電池電解質の安定性向上とマイクロビーム放射光による機構解明 (2015)
  • Author(s): 嶺重 温, 西本 琢磨, 矢澤 哲夫, 横山 和司, 高野 秀和, 竹田 晋吾, 篭島 靖,松井 純爾
  • Organizer: 第12回SPring-8産業利用報告会
  • Place of Presentation: 川崎市産業振興会館（神奈川県川崎市幸区堀川町66番地20）
  • Year and Date: 2015-09-04