Development of metal/Mg2Si composite materials with high thermoelectric efficiency

• Project/Area Number: 17H03398
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Tohoku University
• Principal Investigator: HAYASHI Kei 東北大学, 工学研究科, 准教授 (70360625)
• Co-Investigator(Kenkyū-buntansha): 宮崎 讓 東北大学, 工学研究科, 教授 (40261606)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000); Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2017: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
• Keywords: 熱電変換 / コンポジット / 金属相 / マグネシウムシリサイド / Mg2Si / 金属粒界相 / 機能性複合材料

Outline of Final Research Achievements

We prepared composite thermoelectric materials consisting of Mg2Si and metal to enhance power factor PF and dimensionless figure-of-merit zT of Mg2Si. As a metal, Mg, Al, and Ni were selected. According to the effective-medium theory, it was predicted that PF and zT are enhanced for all these metals; however, it is valid for the Mg/Mg2Si and Al/Mg2Si composite materials. In the case of Ni, PF and zT decreased by preparing the Ni/Mg2Si composite material. This is due to difference in microstructures and barrier heights at the interface between Mg2Si and metal. The maximum zT value of 0.6 (800 K) was obtained for the Al/Mg2Si composite material by the refinement of the microstructure of the dispersed Al metal phase in Mg2Si, which lead to increase in electrical conductivity and decrease thermal conductivity. This value was higher than an partially Al-substituted Mg2Si materials.

Academic Significance and Societal Importance of the Research Achievements

本研究により、金属粒界相を用いてMg2Siの出力因子PFと無次元性能指数zTを両方向上できることが明らかになった。微細組織の形態を制御することで、電気伝導率の増加だけなく、熱伝導率を低減することができる。本成果は、Mg2Siだけでなく、他の熱電材料にも適用できることから、高効率の熱電材料開発を加速するとともに、化石燃料を使用せず、有害ガスや騒音を出さないクリーンな熱電発電の普及に貢献するものと期待される。

Research Products

• [Int'l Joint Research] 清華大学(中国)
• [Journal Article] Control of the Thermoelectric Properties of Mg2Sn Single Crystals via Point-Defect Engineering (2020)
  • Author(s): Saito Wataru、Hayashi Kei、Dong Jinfeng、Li Jing-Feng、Miyazaki Yuzuru
  • Journal Title: Scientific Reports Volume: 10 Issue: 1 Pages: 2020-2020
  • DOI: 10.1038/s41598-020-58998-1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Preparation, thermoelectric properties, and crystal structure of boron-doped Mg2Si single crystals (2020)
  • Author(s): Hayashi Kei、Saito Wataru、Sugimoto Kazuya、Ohoyama Kenji、Hayashi Kouichi、Happo Naohisa、Harada Masahide、Oikawa Kenichi、Inamura Yasuhiro、Miyazaki Yuzuru
  • Journal Title: AIP Advances Volume: 10 Issue: 3 Pages: 035115-035115
  • DOI: 10.1063/1.5143839
  • Peer Reviewed / Open Access
• [Journal Article] Distinct impact of order degree on thermoelectric power factor of p-type full-Heusler Mn2VAl compounds (2020)
  • Author(s): Li Hezhang、Hayashi Kei、Dong Jinfeng、Li Jing-Feng、Miyazaki Yuzuru
  • Journal Title: Materials Research Express Volume: 7 Issue: 5 Pages: 055503-055503
  • DOI: 10.1088/2053-1591/ab875b
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Lattice dynamics and lattice thermal conductivity of CrSi 2 calculated from first principles and the phonon Boltzmann transport equation (2019)
  • Author(s): Nakasawa Hayato、Hayashi Kei、Takamatsu Tomohisa、Miyazaki Yuzuru
  • Journal Title: Journal of Applied Physics Volume: 126 Issue: 2 Pages: 025105-025105
  • DOI: 10.1063/1.5096458
  • Peer Reviewed
• [Journal Article] Fabrication and Thermoelectric Properties of Al/Mg₂Si Composite Materials (2018)
  • Author(s): Y. Hayashibara, K. Hayashi, I. Ando, M. Kubouchi, Y. Ogawa, W. Saito, Y. Miyazaki
  • Journal Title: MATERIALS TRANSACTIONS Volume: 59 Issue: 7 Pages: 1041-1045
  • DOI: 10.2320/matertrans.E-M2018815
  • NAID: 130007410480
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2018-07-01
  • Peer Reviewed
• [Journal Article] Fabrication and thermoelectric properties of Al/Mg2Si composite materials" (2018)
  • Author(s): Y. Hayashibara, K. Hayashi, I. Ando, M. Kubouchi, Y. Ogawa, W. Saito, and Y. Miyazaki
  • Journal Title: Materials Transactions Volume: 印刷中
  • NAID: 130007410480
  • Peer Reviewed
• [Journal Article] Crystal Structure and Thermoelectric Properties of Magnesium Silicide (2017)
  • Author(s): 林 慶, 窪内将隆
  • Journal Title: Materia Japan Volume: 56 Issue: 9 Pages: 546-553
  • DOI: 10.2320/materia.56.546
  • NAID: 130006038180
  • ISSN: 1340-2625, 1884-5843
• [Presentation] Mg空孔欠陥の導入によるMg2Si2-xSbx単結晶の熱電性能向上 (2020)
  • Author(s): 齋藤 亘, 林 慶, 黄志成, 宮﨑 讓
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] Crystal structure evolution of Zn4Sb3 during melt grown process (2019)
  • Author(s): S. Yoshioka, K. Hayashi, Y. Miyazaki
  • Organizer: 38th International and 4th Asian Conference on Thermoelectrics (ICT & ACT 2019)
  • Int'l Joint Research
• [Presentation] Investigation on lattice defects in Mg2Sn single crystals prepared under different Ar partial pressure (2019)
  • Author(s): W. Saito, K. Hayashi, Y. Miyazaki
  • Organizer: 38th International and 4th Asian Conference on Thermoelectrics (ICT & ACT 2019)
  • Int'l Joint Research
• [Presentation] Thermoelectric Properties of Strontium Titanium Oxyhydrides (2019)
  • Author(s): D. Fukutome, T. Takamatsu, K. Hayashi, Y. Miyazaki
  • Organizer: 38th International and 4th Asian Conference on Thermoelectrics (ICT & ACT 2019)
  • Int'l Joint Research
• [Presentation] Thermoelectric properties and local structure of B doped Mg2Si single crystal (2019)
  • Author(s): K. Hayashi, W. Saito, Y. Miyazaki, K. Sugimoto, S. Uechi, Y. Kanazawa, Y. Fukumoto, T. Yamamoto, K. Ohyama, K. Hayashi, N. Happo, M. Harada, K. Oikawa, Y. Inamura
  • Organizer: 38th International and 4th Asian Conference on Thermoelectrics (ICT & ACT 2019)
  • Int'l Joint Research
• [Presentation] Preparation and Thermoelectric Properties of Mn2VAl Full Heusler Alloys with Different Order Degree (2019)
  • Author(s): H. Li, K. Hayashi, Y. Miyazaki
  • Organizer: 38th International and 4th Asian Conference on Thermoelectrics (ICT & ACT 2019)
  • Int'l Joint Research
• [Presentation] Cross-sectional characterization of Mg2Si-Ni interface compacted by SPS method at 800°C (2019)
  • Author(s): T. Ishii, H. Sugawara, M. Tokuda, H. Sato, T. Hanajiri, H. Shimoshige, S. Kurosu, K. Hayashi, I. Ando, W. Saito, and Y. Miyazaki
  • Organizer: 5th Asia-Pacific conference on semiconducting silicides and related materials (APAC-SILICIDE 2019)
  • Int'l Joint Research
• [Presentation] C40型(Mn,Cr)(Si,Al)2系化合物における熱電特性の組成および合成条件依存性 (2019)
  • Author(s): 齋藤啓介, 髙松智寿, 林慶, 宮﨑讓
  • Organizer: 第16回日本熱電学会学術講演会
• [Presentation] Mg空孔欠陥を含むMg2Sn単結晶の熱電性能と微細組織 (2019)
  • Author(s): 齋籐 亘, 林 慶, 宮﨑 讓
  • Organizer: 第80回応用物理学会秋季学術講演会
• [Presentation] Thermoelectric Properties and Local Structure of Boron-Doped Mg2Si and Mg2Sn (2019)
  • Author(s): Kei Hayashi, Wataru Saito, Yuzuru Miyazaki, Kazuya Sugimoto, Syouichi Uechi, Yuki Kanazawa, Yohei Fukumoto, Takayoshi Yamamoto, Kenji Ohoyama, Kouichi Hayashi, Naohisa Happo, Masahide Harada, Kenichi Oikawa, Yasuhiro Inamura
  • Organizer: 14th International Conference on the Structure of Non-Crystalline Materials (NCM14)
  • Int'l Joint Research
• [Presentation] Mn2VAlフルホイスラー合金の熱電特性と規則度の関係 (2019)
  • Author(s): 李和章, 林 慶, 宮﨑 讓
  • Organizer: 第74回応用物理学会東北支部学術講演会
• [Presentation] Thermoelectric Properties of Melt-Grown Mg2Sn1-xGax Ingots (2019)
  • Author(s): Z. Huang, W. Saito, K. Hayashi, Y. Miyazaki
  • Organizer: 第74回応用物理学会東北支部学術講演会
• [Presentation] 溶融合成したZn4Sb3におけるクラック生成機構 (2019)
  • Author(s): 吉岡 駿, 林 慶, 宮﨑 讓
  • Organizer: 第74回応用物理学会東北支部学術講演会
• [Presentation] スピンギャップレス半導体Mn2CoAlの熱電性能 (2019)
  • Author(s): 永島良美, 李和章, 林 慶, 宮﨑 讓
  • Organizer: 第74回応用物理学会東北支部学術講演会
• [Presentation] Understanding Detailed Crystal Structures to Further Improve Thermoelectric Properties of Silicide-based Materials (2019)
  • Author(s): Y. Miyazaki, H. Nagai, W. Saito, K. Hayashi
  • Organizer: 17th European Conference on Thermoelectrics (ECT2019)
  • Int'l Joint Research / Invited
• [Presentation] Determination of dopant position of thermoelectric material B-doped Mg2Si by white neutron holography (2019)
  • Author(s): K. Sugimoto, S. Uechi, Y. Kanazawa, Y. Fukumoto, T. Yamamoto, K. Ohoyama, K. Hayashi, N. Happo, M. Harada, K. Oikawa, Y. Inamura, K. Hayashi, W. Saito, Y. Miyazaki
  • Organizer: ISSP - J-PARC Joint Workshop on Science Frontier by Neutron Scattering ～ The 17th Korea-Japan meeting on Neutron Science ～
  • Int'l Joint Research
• [Presentation] 白色中性子ホログラフィーによる熱電材料BドープMg2Siの研究 (2019)
  • Author(s): 杉本和哉, 上地昇一, 金澤雄輝, 本陽平, 山本隆文, 大山研司, 林好一, 八方直久, 原田正英, 及川健一, 稲村康弘, 林慶, 齋藤亘, 宮﨑讓
  • Organizer: 日本物理学会 第74回年次大会
• [Presentation] 単結晶作製時の圧力変化によるMg2Snの格子欠陥制御 (2019)
  • Author(s): 齋籐 亘, 林 慶, 宮﨑 讓
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] Measurements of surface potential of M/Mg2Si (M = Mg, Al, Ni) interfaces (2018)
  • Author(s): I. Ando, K. Hayashi, W. Saito, Y. Hayashibara, Y. Miyazaki
  • Organizer: 37th International and 16th European Conference on Thermoelectrics (ICT & ECT 2018)
  • Int'l Joint Research
• [Presentation] Mg2Snの伝導型と結晶構造に対する格子欠陥の効果 (2018)
  • Author(s): 齋藤亘, 林慶, 宮﨑讓
  • Organizer: 第15回日本熱電学会学術講演会
• [Presentation] 白色中性子ホログラフィーによる熱電材料BドープMg2Siの研究 (2018)
  • Author(s): 杉本和哉, 上地昇一, 金澤雄輝, 福本陽平, 山本隆文, 大山研司, 林好一, 八方直久, 原田正英, 及川健一, 稲村康弘, 林慶, 齋藤亘, 宮﨑讓
  • Organizer: 第8回3D活性サイト科学成果報告会
• [Presentation] マグネシウムシリサイド熱電材料における活性サイトの研究 (2018)
  • Author(s): 林慶, 齋藤亘, 宮﨑讓, 杉本和哉, 上地昇一, 金澤雄輝, 福本陽平, 山本隆文, 大山研司, 林好一, 八方直久, 原田正英, 及川健一, 稲村康弘
  • Organizer: 第8回3D活性サイト科学成果報告会
• [Presentation] 白色中性子ホログラフィーによる熱電材料BドープMg2Siの研究 (2018)
  • Author(s): 杉本和哉, 上地昇一, 金澤雄輝, 福本陽平, 山本隆文, 大山研司, 林好一, 八方直久, 原田正英, 及川健一, 稲村康弘, 林慶, 齋藤亘, 宮﨑讓
  • Organizer: 日本中性子科学会 第18回年会
• [Presentation] Mg2Snの結晶構造と伝導型の関係に関する研究 (2018)
  • Author(s): 齋藤亘, 林慶, 宮﨑讓
  • Organizer: 応用物理学会東北支部 第73回学術講演会
• [Presentation] Microstructure and thermoelectric properties of metal / magnesium silicide composite materials (2018)
  • Author(s): K. Hayashi
  • Organizer: Advanced Composite Materials Congress 2018
  • Int'l Joint Research / Invited
• [Presentation] Microstructure and thermoelectric properties of magnesium silicide composites (2018)
  • Author(s): K. Hayashi
  • Organizer: World Congress of Smart Materials 2018
  • Int'l Joint Research / Invited
• [Presentation] Mg2Si/M (M = Mg, Al, Ni)界面の表面電位測定 (2018)
  • Author(s): 安藤 郁美, 林 慶, 齋藤 亘, 林原 佑太, 宮﨑 讓
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Mg2Si/M (M=Mg, Al, Ni)界面の表面電位測定 (2017)
  • Author(s): 安藤郁美, 林 慶，齋藤 亘, 林原佑太, 宮﨑 讓
  • Organizer: 応用物理学会東北支部 第72回学術講演会
• [Presentation] Analysis of point defects in Mg-Si-Sn ternary thermoelectric compounds (2017)
  • Author(s): M. Kubouchi, K. Hayashi, Y. Ogawa, W. Saito, Y. Miyazaki, and R. Funahashi
  • Organizer: The 15th International Conference on Advanced Materials IUMRS-ICAM 2017
  • Int'l Joint Research
• [Book] Thermoelectric Materials Principles and Concepts for Enhanced Properties (Ed. Ken Kurosaki, Yoshiki Takagiwa and Xun Shi) (2020)
  • Author(s): Kei Hayashi, Yuzuru Miyazaki, Wataru Saito, Masataka Kubouchi, Yohei Ogawa, Shogo Suzuki, Yuta Hayashibara, Ikumi Ando
  • Total Pages: 280
  • Publisher: De Gruyter
  • ISBN: 9783110596489