Hagiwara, Manabu

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Chemistry (Yagami)

Position

Assistant Professor/Senior Assistant Professor

E-mail Address

E-mail address

External Links

Career 【 Display / hide

  • 2011.04
    -
    2013.03

    日本学術振興会, 特別研究員(DC1)

  • 2013.04
    -
    2016.03

    慶應義塾大学, 理工学部応用化学科, 助教(有期)

  • 2016.04
    -
    Present

    慶應義塾大学, 理工学部応用化学科, 助教

Academic Background 【 Display / hide

  • 2007.04
    -
    2009.03

    Tokyo Institute of Technology, 工学部, 無機材料工学科

    Japan, University, Graduated

  • 2009.04
    -
    2011.03

    Tokyo Institute of Technology, 理工学研究科, 材料工学専攻

    Japan, Graduate School, Completed, Master's course

  • 2011.04
    -
    2013.03

    Tokyo Institute of Technology, 理工学研究科, 材料工学専攻

    Japan, Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • 博士(工学), Tokyo Institute of Technology, Coursework, 2013.03

    Study on Nonlinear Phenomena in Piezoelectric Ceramics

 

Research Areas 【 Display / hide

  • Inorganic industrial materials

  • Inorganic materials/Physical properties

 

Books 【 Display / hide

  • エレクトロニクス用セラミックスの開発、評価手法と応用

    技術情報協会, 技術情報協会, 2020.08,  Page: 543p

    Scope: 第2章・第2節「水熱法を利用した(Bi1/2K1/2)(ZrxTi1-x)O3非鉛圧電セラミックスの作製」(P.82~ P.87)

Papers 【 Display / hide

  • Fabrication of highly (1 1 1)-oriented Cu2O films on glass substrates by repeated chemical bath deposition

    Daichi Tonagi, Manabu Hagiwara, Shinobu Fujihara

    Journal of Crystal Growth (Elsevier BV)  551   125920 - 125920 2020.12

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  0022-0248

  • Hydrothermal growth of c-axis oriented ferroelectric (Bi1/2K1/2)TiO3 films on metal substrates

    Masayoshi Yamamoto, Ryotaro Sakurai, Manabu Hagiwara, Shinobu Fujihara

    Thin Solid Films (Elsevier BV)  713   138342 - 138342 2020.11

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  0040-6090

  • Effect of micro-/mesoporous structures on H2O2 sensing ability of YVO4:Eu3+ phosphor particles

    Kasumi MOTOMIYA, Manabu HAGIWARA, Shinobu FUJIHARA

    Journal of the Ceramic Society of Japan (Ceramic Society of Japan)  128 ( 8 ) 532 - 538 2020.08

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  1882-0743

  • (Bi1/2K1/2) TiO3–SrTiO3 solid-solution ceramics for high-temperature capacitor applications

    Minami Shiga, Manabu Hagiwara,* and Shinobu Fujihara

    Ceramics International (Ceramics International)  46 ( 8 ) 10242 - 10249 2020.06

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  02728842

     View Summary

    © 2020 Elsevier Ltd and Techna Group S.r.l. The relaxor state of (Bi1/2K1/2)TiO3 exhibits promising dielectric properties for high-temperature capacitor applications, but the spontaneous phase transition into the low-temperature ferroelectric state and the excessively high dielectric maximum temperature (Tm) at around 360 °C are the main drawback to this material. In this study we examined solid solutions of (Bi1/2K1/2)TiO3 with SrTiO3 to improve the temperature stability of the dielectric properties. As precursors to fabricate the sold-solution ceramics, fine powders of (Bi1/2K1/2)TiO3 and SrTiO3 were both synthesized by the hydrothermal method. Dense (1 − x)(Bi1/2K1/2)TiO3–xSrTiO3 ceramics with x up to 0.5 were then obtained by reaction sintering of the powders. A crystal structure analysis revealed that the average symmetry of the solid-solution ceramics changes from tetragonal to cubic with increasing the SrTiO3 content. Dielectric measurements showed that the incorporation of SrTiO3 into (Bi1/2K1/2)TiO3 stabilizes the relaxor state to shift Tm largely toward lower temperatures. As a result, the sample with x = 0.5 exhibited a temperature-stable dielectric permittivity of 1700 ± 15% over a wide temperature range from room temperature up to 260 °C. The electric-field and temperature dependences of the energy-storage properties of the sample were also investigated.

  • Fabrication of highly textured Ca3Co4O9 ceramics with controlled density and high thermoelectric power factors

    Rina Shimonishi, Manabu Hagiwara,* and Shinobu Fujihara*

    Journal of the European Ceramic Society 40 (4), 1338-1343 (Journal of the European Ceramic Society)  40 ( 4 ) 1338 - 1343 2020.04

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  09552219

     View Summary

    © 2019 Elsevier Ltd Ca3Co4O9 ceramics have been studied as an alternative p-type thermoelectric material. Thermoelectric properties of the ceramics would be improved by either orientation of grains or introduction of pores. In this study, we fabricated textured Ca3Co4O9 ceramics with controlled density by a reactive-templated grain growth method combined with a hot-forging technique. A powder precursor obtained by mixing β-Co(OH)2 as a template and CaCO3 as a matrix was uniaxially pressed into pellets and sintered under hot-forging pressures up to 5.0 MPa. The relative density of the resulting ceramics was varied between 41.0 and 83.8 % while all the ceramics showed excellent c-axis orientation. The in-plane electrical conductivity of our ceramics could be kept relatively higher than that ever reported previously due to the orientation. Because Seebeck coefficient did not depend on the relative density, the higher electrical conductivity of our ceramics led directly to improved thermoelectric power factors between 67.0 and 409 μW·m−1 K−2.

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Papers, etc., Registered in KOARA 【 Display / hide

Reviews, Commentaries, etc. 【 Display / hide

  • 水熱法を活用した高品質ビスマス系非鉛圧電セラミックスの作製

    萩原学, 藤原忍

    セラミックス 54 ( 8 ) 559 2019.08

    Introduction and explanation (scientific journal), Joint Work

Presentations 【 Display / hide

  • 層状イットリウム水酸化物の構造制御と蛍光センシング材料への応用

    森山 隼、萩原学、藤原忍

    日本セラミックス協会 2018年年会, 2018.03, Oral Presentation(general)

  • 水熱合成法による金属基板上への(Bi1/2K1/2)TiO3膜の作製と振動発電素子への応用

    萩原学、櫻井亮太朗、藤原忍

    日本セラミックス協会 2018年年会, 2018.03, Oral Presentation(general)

  • ゾル-ゲル法によるBaTiO3系ナノコンポジット誘電体膜の作製

    宮川雄貴、萩原学、藤原忍

    日本セラミックス協会 2018年年会, 2018.03, Poster (general)

  • 2相ゾル-ゲル法で合成したYVO4:Eu3+ナノ/マイクロ構造膜によるH2O2センシング

    本宮香純、萩原学、藤原忍

    日本セラミックス協会 2018年年会, 2018.03, Poster (general)

  • 異なるイットリウム源を用いた固相反応によるCuYO2半導体セラミックスの作製

    鳴嶋俊介、萩原学、藤原忍

    第37回エレクトロセラミックス研究討論会, 2017.10, Poster (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • 高性能な酸化物熱電材料の開発に向けた複合カチオンエンジニアリングの構築

    2020.04
    -
    2024.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 萩原 学, Grant-in-Aid for Scientific Research (B), Principal Investigator

  • 複合カチオンエンジニアリングによる超低熱伝導性酸化物の設計・合成と熱電特性の向上

    2018.04
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 萩原 学, Grant-in-Aid for Early-Career Scientists , Principal Investigator

  • Creation of dielectric materials for high-temperature capacitor applications using relaxor phases of A-site complex perovskites

    2016.04
    -
    2018.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 萩原 学, Grant-in-Aid for Young Scientists (B), Principal Investigator

 

Courses Taught 【 Display / hide

  • SEMINAR IN APPLIED CHEMISTRY

    2021

  • NANO SCALE SCIENCE JOINT SEMINAR

    2021

  • MATERIAL DESIGN SCIENCE JOINT SEMINAR

    2021

  • LABORATORY IN SCIENCE

    2021

  • LABORATORIES IN APPLIED CHEMISTRY A

    2021

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Courses Previously Taught 【 Display / hide

  • 自然科学実験

    Keio University, 2014, Autumn Semester, General education subject

  • 応用化学実験A

    Keio University, 2014, Spring Semester, Major subject, Laboratory work/practical work/exercise

 

Memberships in Academic Societies 【 Display / hide

  • 日本セラミックス協会