Study at TCU


Name MARUYAMA Satofumi
Official Title Associate Professor
Affiliation Faculty of Science and Engineering Department of Mechanical Engineering
Profile I have been working on the synthesis and characterization of boron-based materials since I was a doctoral student. As boron lacks valence electrons, the crystal structure of the same binary borides changes in various structures according to the ratio of the [metal]/[boron]. These structural changes and complex structures result in the creation of various physical properties. So far, I have been synthesizing borides for thermoelectric materials and super-hard materials. The main results include the control of p-type conduction or n-type conduction in YAlB14-based materials through the control of Al occupancy in YAlB14 compound and the evaluation of mechanical properties of Mo2NiB2-based hard materials from both first-principles calculations and experimental methods.
These studies are based on material synthesis and crystal structure characterization, such as Rietveld refinement, which are my areas of expertise. I am particularly interested in the creation of new physical properties through the control of crystal structure. I am working on creating new materials that do not exist in the world and the synthesis of materials, which exhibit unconventional performance in mechanics or thermoelectric.
Research Field(Keyword & Summary)
  1. Borides, Mechanical properties, Thermoelectrics, LPS, SPS

    My research is searching and fabrication for new inorganic and intermetallic compounds, mainly boron-based materials, and applying to energy materials such as superhard materials and thermoelectrics. In particular, our research focuses on material design from a crystallographic approach and the fabrication of sintered materials using various sintering techniques such as spark plasma sintering(SPS) and liquid-phase sintering(LPS).

Representative Papers
  1. R. Maki, K. Yokoyama, S. Maruyama, Y, Kusano, "Thermoelectric properties of oxygen-deficient spinel-type ZnxFe3-xO4-d prepared by carbothermal reduction and spark plasma sintering", Materialia, 26 (2022) 101596.
  2. J. Watanabe, R. Koyama, S. Maruyama, “Fabrication and mechanical properties of Cr, V doped Mo2NiB2 hard materials based on crystallographic approaches”, Journal of the Japan Society of Powder and Powder Metallurgy, 108 (2020) 106373.
  3. J. Watanabe, T. Ota, S. Maruyama, “Synthesis and crystal structure of Mo2Ni1-xCrxB2 hard materials”, Solid State Sciences, 108 (2020) 106373.
  4. J-L. Innocent, D. Portehault, G. Gouget, S. Maruyama, I. Ohkubo, T. Mori, “Thermoelectric properties of boron carbide/HfB2 composites”, Materials for Renewable and Sustainable Energy, 6 (2017) 6.
  5. K. Wei, J. Martin, S. Maruyama, T. Mori, G. S. Nolas, “Physical properties of madocite: A quaternary chalcogenide with very low thermal conductivity”, Journal of Solid State Chemistry, 251 (2017) 113
  6. N. Tsujii, F. Meng, K. Tsuchiya, S. Maruyama, T. Mori, “Effect of Nanostructuring and High-Pressure Torsion Process on Thermal Conductivity of Carrier-Doped Chalcopyrite”, Journal of Electronic Materials, 45 (2016) 1642.
  7. S. Maruyama, T. Nishimura, Y. Miyazaki, K. Hayashi, T. Kajitani and T. Mori, “Microstructure and thermoelectric properties of YxAlyB14 samples fabricated through the spark plasma sintering”, Materials for Renewable and Sustainable Energy, 3 (2014) 31.
  8. S. Maruyama, P. Anastasiia, Y. Miyazaki, K. Hayashi, T. Kajitani and T. Mori, “Al insertion and additive effects on the thermoelectric properties of yttrium boride”, Journal of Applied Physics, 115 (2014) 123702
  9. S. Maruyama, Y. Miyazaki, K. Hayashi, T. Kajitani and T. Mori, “Excellent P-N Control in a High Temperature Thermoelectric Boride”, Applied Physics Letters, 101 (2012) 152101.
Grant-in-Aid for Scientific Research Support: Japan Society for Promotion of Science (JSPS)
Recruitment of research assistant(s) No
Affiliated academic society (Membership type) Japan Society of Powder and Powder Metallurgy (Senior member)
Thermoelectrics Sosiety of Japan (Senior member)
Education Field (Undergraduate level) Introduction to Materials,
Education Field (Graduate level) Engineering Materials,