Thermoelectric properties and microstructures of misfit-layered cobalt oxides

• Project/Area Number: 26420666
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Nagasaki University
• Principal Investigator: MORIMURA Takao 長崎大学, 工学研究科, 准教授 (30230147)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 熱電変換材料 / 走査透過型電子顕微鏡 / 無次元性能指数 / ゼーベック係数 / HAADF-STEM像 / HAADF－STEM像

Outline of Final Research Achievements

Doping of Sr and Ti in thermoelectric material Ca3Co4O9 enhanced dimensionless figure of merit ZT. EDX STEM experiments revealed that Sr and Ti substituted for Ca and Co in the rock salt layer, respectively. In Ca3Co4+xO9, ZT increased with x by the occurrence of stacking fault.
The doping of Sr in Ca2Bi2Co2Oy enhanced ZT by the substitution of Sr for Ca. By the substitution for more than half, ZT exceeded that of Ca3Co4O9.
HAADF STEM image simulations by Bloch wave method were applied to Ca3Co4O9. By comparing with the experimental images, Sr occupancies in Ca sites were quantitatively revealed.

Research Products

• [Journal Article] Preparation of Metal-Containing Diamond-Like Carbon Films by Magnetron Sputtering and Plasma Source Ion Implantation and Their Properties (2017)
  • Author(s): S. Flege, R. Hatada, A. Hanauer, W. Ensinger, T. Morimura, K. Baba
  • Journal Title: Advances in Materials Science and Engineering Volume: 2017 Pages: 1-8
  • DOI: 10.1155/2017/9082164
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Electroplated Fe-Co-Ni films prepared from deep-eutectic-solvent based plating baths (2016)
  • Author(s): T. Yanai, K. Shiraishi, T. Akiyoshi, K. Azuma, Y. Watanabe, T. Ohgai, T. Morimura, M. Nakano, H. Fukunaga
  • Journal Title: AIP ADVANCES Volume: ６ Issue: 5
  • DOI: 10.1063/1.4943533
  • Peer Reviewed / Open Access
• [Journal Article] Effects of Initial States on the Spinodal Decomposition of Quenched and Melt-Spun Cu-15Ni-8Sn Alloy (2015)
  • Author(s): 近藤慎一郎、枡崎昭憲、小川兼人、森村隆夫、中島弘道
  • Journal Title: Journal of the Japan Institute of Metals and Materials Volume: 79 Issue: 12 Pages: 664-671
  • DOI: 10.2320/jinstmet.J2015012
  • NAID: 130005109975
  • ISSN: 0021-4876, 1880-6880, 2433-7501
  • Peer Reviewed
• [Journal Article] Magnetic analysis of a melt-spun Fe-dilute Cu60Au35Fe5 alloy (2015)
  • Author(s): S. Kondo, K. Ogawa, T. Morimura, H. Nakashima, S. Kobayashi, C. Michioka, K. Yoshimura
  • Journal Title: J. Alloy compd Volume: 640 Pages: 193-200
  • DOI: 10.1016/j.jallcom.2015.04.004
  • Peer Reviewed
• [Journal Article] Magnetic analysis of a melt-spun Fe-dilute Cu60Ag35Fe5 alloy (2015)
  • Author(s): S. Kondo, K. Kaneko, T. Morimura, H. Nakashima, S. Kobayashi, C. Michioka, K. Yoshimura
  • Journal Title: Physica Volume: B463 Pages: 108-113
  • DOI: 10.1016/j.physb.2015.02.001
  • Peer Reviewed
• [Journal Article] Effects of Initial States on the Spinodal Decomposition of Quenched and Melt-Spun Cu-15Ni-8Sn Alloy (2015)
  • Author(s): S. Kondo, A. Masusaki, K. Ogawa, T. Morimura, H. Nakashima
  • Journal Title: MATERIALS TRANSACTIONS Volume: 56 Issue: 1 Pages: 23-29
  • DOI: 10.2320/matertrans.M2014234
  • NAID: 130004704638
  • ISSN: 1345-9678, 1347-5320
  • Peer Reviewed
• [Journal Article] Microstructures and Thermoelectric Properties of Sintered Misfit-Layered Cobalt Oxide (2014)
  • Author(s): T. Morimura, T. Yamaguchi, T. Kojima, N. Matsuya, S. Kondo, H. Nakashima
  • Journal Title: J. Electron. Mater Volume: 43 Issue: 6 Pages: 1603-1607
  • DOI: 10.1007/s11664-013-2805-7
  • NAID: 120006986539
  • Peer Reviewed
• [Journal Article] Magnetic properties and microstructure of Sm-Co/α-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers (2014)
  • Author(s): A. Tou, T. Morimura, M. Nakano, Y. Yamai, H. Fukunaga
  • Journal Title: J. Appl. Phys Volume: 115 Issue: 20
  • DOI: 10.1063/1.4871335
  • NAID: 120006986466
  • Peer Reviewed
• [Presentation] 液体急冷したNi-Cu-Sn合金のスピノーダル分解 (2016)
  • Author(s): 堤孝瑛、近藤慎一郎、森村隆夫、中島弘道
  • Organizer: 日本金属学会九州支部・日本鉄鋼協会九州支部・軽金属学会九州支部共催合同学術講演大会
  • Place of Presentation: 九州大学筑紫キャンパス（福岡市）
• [Presentation] Ca-Co-O系ミスフィット型層状酸化物の結晶構造と熱電特性 (2016)
  • Author(s): 本村直弥、小島隆聡、森仁史、森村隆夫、近藤慎一郎、中島弘道
  • Organizer: 日本金属学会九州支部・日本鉄鋼協会九州支部・軽金属学会九州支部共催合同学術講演大会
  • Place of Presentation: 九州大学筑紫キャンパス（福岡市）
• [Presentation] Ca-Co-O系ミスフィット型層状酸化物の熱電特性の改善 (2015)
  • Author(s): 阿南朋宏、森村隆夫、近藤慎一郎、中島弘道
  • Organizer: 日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部共催合同学術講演会
  • Place of Presentation: 北九州市国際会議場（福岡県北九州市）
  • Year and Date: 2015-06-06
• [Presentation] 液体急冷したCuNiSn合金に於けるスピノーダル分解の遅れ (2015)
  • Author(s): 堤貴瑛、近藤慎一郎、森村隆夫、中島弘道
  • Organizer: 日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部共催合同学術講演会
  • Place of Presentation: 北九州市国際会議場（福岡県北九州市）
  • Year and Date: 2015-06-06
• [Presentation] Bloch波法によるSTEM像シミュレーションのミスフィット型層状酸化物への適用 (2014)
  • Author(s): 小川兼人、森村隆夫、佐藤幸生、幾原雄一、近藤慎一郎
  • Organizer: 日本顕微鏡学会九州支部学術講演会
  • Place of Presentation: 宮崎市宮崎市民プラザ
  • Year and Date: 2014-12-06
• [Presentation] Zn添加ミスフィット型層状酸化物のSTEM観察と熱電特性 (2014)
  • Author(s): 小島隆聡、森村隆夫、佐藤幸生、幾原雄一、近藤慎一郎
  • Organizer: 日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部共催合同学術講演大会
  • Place of Presentation: 福岡市九州大学伊都キャンパス
  • Year and Date: 2014-06-07
• [Presentation] 液体急冷したCu-Ti合金のスピノーダル分解初期過程 (2014)
  • Author(s): 小川兼人、近藤慎一郎、森村隆夫、中島弘道
  • Organizer: 日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部共催合同学術講演大会
  • Place of Presentation: 福岡市九州大学伊都キャンパス
  • Year and Date: 2014-06-07
• [Presentation] ミスフィット型層状酸化物のSTEM観察と熱電特性 (2014)
  • Author(s): 烏山悟史、山口隆大、森村隆夫、佐藤幸生、幾原雄一
  • Organizer: 日本顕微鏡学会
  • Place of Presentation: 千葉市幕張メッセ国際会議場
  • Year and Date: 2014-05-11 – 2014-05-13