Materials Development Division

Structure-Controlled Functional Materials



  • Assoc. Prof. Norihiko OKAMOTO
  • Assist. Prof. Hiroshi TANIMURA
  • Assist. Prof. Tomoya KAWAGUCHI

Development of Novel Functional/Strcutural Materials Through Structural Control or Phase-Transformation Process

Since 2018, our laboratory name has been changed to "Structure-Controlled Functional Materials". In our laboratory, we aim to develop novel materials exhibiting new functions (in terms of mechanical properties, electrical, optical properties, etc) by controlling the material structures, with the aid of several experimental techniques such as high-frequency internal friction measurement, synchrotron X-ray/electron-beam diffraction analysis, femtosecond laser pump-probe measurement, and so on. Our study field is mainly based on the materials microstructure theory, thermal statistical thermodynamics, micromechanics theory, and electrochemistry.

Specifically, we focus on: (i) microstructure formation dynamics of solid-solid phase phase transition and its control by application of external fields, (ii) elucidation of relaxation mechanism and structural inhomogeneity in metallic glasses and their analog high-entropy alloys using megahertz oscillation and internal friction techniques, (iii) energy materials for novel energy storage systems and thermoelectric materials, (iv) ultrafast photoinduced phase change materials, and (v) material design utilizing phase transition such as titanium alloys, etc. In the end, we aim to investigate across the various fields to develop new materials possessing new functionalities.

phase transition dynamics, electrode microstructure study, amorphous material, micromechanics
The partially crystallized structureunder ultrasonic oscillation resonating withβ relaxation of a Pd-based metallic glass

(Left) The partially crystallized structure under ultrasonic oscillation resonating with β relaxation of a Pd-based metallic glass, structural inhomogeneity and phonon dispersion schematics. (Right) Spinel-to-rocksalt phase transition that occurs when Mg ions are inserted into MgCo2O4 as a positive electrode material for magnesium rechargeable battery.

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