Institute of Multidisciplinary Research for Advanced Materials, Tohoku University


LAST UPDATE 2021/05/02

  • 研究者氏名
    Researcher Name

    山田高広 Takahiro YAMADA
    教授 Professor
  • 所属
    Professional Affiliation

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    無機材料研究部門 無機固体材料化学研究分野
    Division of Inorganic Material Research, Inorganic Solid State Materials Chemistry
  • 研究キーワード
    Research Keywords

    極性金属間化合物, ジントル相, 金属窒化物
    Exploration of novel compounds and materials
    Polar intermetallics, Zintl phases, Metal nitrides
    Thermoelectric materials, crystal structure
Research Subject
Exploration of novel inorganic functional materials, and development of new synthetic processes

研究の背景 Background


Most inorganic materials are metals, alloys, and oxides, and inorganic compounds such as nitrides and intermetallic compounds also have high potential as functional materials. There are many inorganic compounds which have not been found or whose functions have not been fully revealed and understood. The fundamental research by exploration and characterization of novel compounds, and by developing new synthesis process which can control the morphology are important to break the limit of the performance of a few existing materials.

研究の目標 Outcome


 We aim to develop low-temperature synthesis of advanced inorganic compounds with various morphologies, and exploration of novel materials focusing on thermoelectric materials, hard ceramics and metals, and superconductors by exploratory research of novel inorganic compounds, and preparation of high-quality samples by new synthetic processes, and characterization of their functionality and demonstration of the mechanism through appropriate experiments and theoretical calculations.

研究図Research Figure

Fig.1. 新規ジントル化合物NaMgBiの結晶構造./ Crystal structure of a novel Zintl phase NaMgBi.

Fig.2. 固体窒素源を用いた新しい合成手法により合成されたε-TaNおよびθ-TaNの単結晶粒. / Single crystal grains of ε-TaN and θ-TaN prepared from metal oxides and BN with Na at 1100˚C.

Fig.3. ノーダルライン半金属超伝導体NaAlSiの単結晶と電気抵抗率. / Single crystal of nodal-line semimetallic superconductor NaAlSi.

文献 / Publications

“A novel ternary bismuthide, NaMgBi: crystal and electronic structure and electrical properties”, Zeitschrift für Naturforschung B 76, 789 (2021), “Preparation of faceted TaN grains by heating Ta-containing oxides in BN crucible with Na”, Ceramics International 48, 10817 (2022), “Superconductivity in the Topological Nodal-line Semimetal NaAlSi”, Journal of the Physical Society of Japan 90, 034710 (2021).