Investigation of multifunctionality of layered tin pnictides

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15291
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: Goto Yosuke 東京都立大学, 理学研究科, 助教 (60760783)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 超伝導 / 熱電変換 / エネルギー材料

Outline of Final Research Achievements

We investigated layered tin pnictides as a novel multifunctional material. We demonstrate that superconducting transition temperature of NaSn2As2 is increased to 2.0 K by tuning stoichiometry. We prepared polycrystalline NaSn2As2 that exhibit axis-dependent carrier polarity, indicating applicability of this material for transverse thermoelectric conversion. We show the activity of Li1-xSn2+xP2 as an anode material for rechargeable Li-ion batteries.
In summary, we demonstrate layered tin pnictides as an attractive material for superconductivity, thermoelectrics, and rechargeable Li-ion batteries.

Free Research Field

固体物理、固体化学

Academic Significance and Societal Importance of the Research Achievements

多様な機能が発現する新物質の開発は材料科学の発展に重要な寄与を果たしてきた。我々はスズ・ニクタイド伝導層を有する新しい超伝導体（NaSn2As2やNa1-xSn2P2）を世界に先駆けて報告してきた（J. Phys. Soc. Jpn. 2017, Sci. Rep. 2018など）。本研究では、層状スズ・ニクタイドの構成元素、電子状態の制御により新しい機能発現を目的とした。結果として、超伝導転移温度の上昇のみならず、熱電変換、リチウムイオン二次電池への応用といった観点からも興味深い物質を開発することに成功した。