Hagiwara, Manabu

写真a

Affiliation

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

Position

Assistant Professor/Senior Assistant Professor

External Links

Career 【 Display / hide

  • 2011.04
    -
    2013.03

    日本学術振興会, 特別研究員(DC1)

  • 2013.04
    -
    2021.03

    Keio University, Faculty of Science and Technology Department of Applied Chemistry, Research Associate

  • 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
    -
    2021.03

    慶應義塾大学, 理工学部応用化学科, 助教

  • 2018.09
    -
    2019.08

    ノルウェー科学技術大学, 客員研究員

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Academic Background 【 Display / hide

  • 2007.04
    -
    2009.03

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

    University, Graduated

  • 2009.04
    -
    2011.03

    Tokyo Institute of Technology, Graduate School of Engineering, Department of Metallurgy and Ceramics Science

  • 2009.04
    -
    2011.03

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

    Graduate School, Completed, Master's course

  • 2011.04
    -
    2013.03

    Tokyo Institute of Technology, Graduate School of Engineering, Department of Metallurgy and Ceramics Science

  • 2011.04
    -
    2013.03

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

    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

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Research Keywords 【 Display / hide

  • Ceramics

  • Piezoelectrics

  • Ferroeletrics

  • Materials Science

  • Inorganic Chemistry

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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 and luminescence switching of Pt-loaded macro-porous Y2WO6:Eu3+ phosphor thin films for hydrogen-gas detection

    Hong Ye, Manabu Hagiwara, Shinobu Fujihara

    Optical Materials  2023.11

    Research paper (scientific journal), Joint Work, Accepted

  • Impact of synthesis route on the microstructure and energy-storage properties of (Bi1/2K1/2)TiO3–SrTiO3 relaxor ferroelectric ceramics: Solid-state and hydrothermal approaches

    Maho Kitamura, Shinobu Fujihara, Manabu Hagiwara

    Journal of the European Ceramic Society  2023.11

    Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted

  • Temperature-Stable Linear Dielectric Response of Low-Temperature Sintered La-Doped Bi<sub>2</sub>SiO<sub>5</sub> Ceramics

    Yoji Yasumoto, Taro Kuwano, Hiroki Taniguchi, Shinobu Fujihara, Manabu Hagiwara

    ACS Applied Electronic Materials (American Chemical Society (ACS))   2023.07

    Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted,  ISSN  2637-6113

  • Multistep synthesis of VO2 (M) nanoparticles and their application to thermochromic hybrid films for IR modulation

    Soon‐il Kwon, Manabu Hagiwara, Sae‐hoon Kim, Shinobu Fujihara

    International Journal of Applied Ceramic Technology  2023.05

    Research paper (scientific journal), Joint Work, Accepted

  • Influence of ZIF-8 modification on performance of ZnO-based dye-sensitized solar cells

    Masaya Sugihara, Manabu Hagiwara, Shinobu Fujihara

    Journal of Solid State Electrochemistry  2023.01

    Research paper (scientific journal), Joint Work, Accepted

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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

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work

  • ゲーレナイトの圧電材料としての可能性

    TAKEDA HIROAKI, HOSHINA TAKUYA, TSURUMI TAKAAKI, KODAMA NOBUHIRO, HAGIWARA MANABU, FUJIHARA SHINOBU

    日本電子材料技術協会会報 (日本電子材料技術協会)  47 ( 11 ) 11 - 15 2016.11

    ISSN  0285-3833

Presentations 【 Display / hide

  • BiFeO3系ナノ粒子のソルボサーマル合成と低温焼結

    萩原学, 新庄祐太, 森雅恵, 藤原忍

    第42回電子材料研究討論会, 

    2022.11

    Oral presentation (general)

  • 熱電変換応用に向けた(La1/2K1/2)TiO3系セラミックスの作製と結晶構造解析

    櫻庭秀悟, 藤原忍, 萩原学

    第42回電子材料研究討論会, 

    2022.11

    Oral presentation (general)

  • ジルコニアナノ粒子が示す欠陥誘起強磁性におよぼす合成条件の影響

    西出 宥太朗, 伊東 正浩, 賀茂 尚広, 中島 靖, 藤原 忍, 萩原 学

    日本セラミックス協会 第35回秋季シンポジウム, 

    2022.09

    Poster presentation

  • 2段階液相プロセスによるCaTiO3:Pr3+球状マイクロ粒子の合成と発光特性

    矢澤 創太郎, 萩原 学, 藤原 忍

    日本セラミックス協会 第35回秋季シンポジウム, 

    2022.09

    Poster presentation

  • SnO2ナノ構造体とAgナノ粒子の複合化による多色間エレクトロクロミック素子の作製

    波田野 凌, 萩原 学, 藤原 忍

    日本セラミックス協会 第35回秋季シンポジウム, 

    2022.09

    Poster presentation

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

  • Understanding and control of hyper-ordered structures governing dielectric responses of Bi-based relaxor ferroelectrics

    2023.04
    -
    2025.03

    日本学術振興会, 科学研究費助成事業 学術変革領域研究(A), 学術変革領域研究(A), Principal investigator

  • Development of complex-cation engineering for high-performance thermoelectric oxides

    2020.04
    -
    2024.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

     View Summary

    本研究の目的は、価数の異なる2種類のカチオンからなる“複合カチオン”を金属酸化物半導体に導入することで、フォノン散乱の増強によって熱伝導率を大幅に低減し、中温(300℃程度)から高温(900℃程度)までの幅広い温度範囲で優れた特性を示す熱電変換材料を創製することである。2021年度は、まず空気中での焼成が可能なn型の酸化物半導体であるマンガン酸カルシウムCaMnO3(CM)についてNa+および希土類イオン(La3+, Gd3+, Dy3+)からなる複合カチオンでCa2+を部分置換したセラミックスを作製し、その電気伝導および熱伝導特性を調べた。その結果、複合カチオンの部分置換によって300 Kから700 Kの温度範囲での熱伝導率が大きく低下し、またイオン半径の大きいLa3+を使った場合に比べてより小さいGd3+あるいはDy3+を使った場合のほうが、高い熱電変換特性が得られることがわかった。また、チタン酸系のAサイト複合ペロブスカイト型酸化物である(La1/2K1/2)TiO3(LKT)について放射光X線を用いた全散乱測定を行い、得られた原子対相関関数を逆モンテカルロ・シミュレーションにより解析した。その結果、LKTのTi4+イオン周りの配位環境は既往の熱電材料であるSrTiO3と非常に似通っており、キャリア密度を増大させればSrTiO3と同等の高い電気伝導性が実現できることが示唆された。今後はLKT系の材料についてプロセスおよびドーピングのさらなる最適化により、高い電気伝導性を示す試料の作製を試みていく。

  • Design and synthesis of thermoelectric oxides with ultralow thermal conductivity by complex cation engineering

    2018.04
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Manabu Hagiwara, Grant-in-Aid for Early-Career Scientists , Principal investigator

     View Summary

    This study aimed to develop n-type thermoelectric oxides with a low thermal conductivity by constructing the A-site of perovskite titanate with a complex cation composed of lanthanum and potassium ions. Semiconductive ceramic samples were obtained by the conventional solid-state synthesis process. It was found that obtained samples have a highly reduced thermal conductivity. A pair distribution function analysis by the reverse Monte Carlo method suggested that a nanometer-scale chemical heterogeneity of lanthanum and potassium ions contributes to the reduced thermal conductivity. It was also showed that doping of barium is effective to increase the electrical conductivity.

  • 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, Hagiwara Manabu, Grant-in-Aid for Young Scientists (B), Principal investigator

     View Summary

    This study aimed to develop high-temperature dielectric materials using the relaxor phase of bismuth potassium titanate (BKT). We first studied the mechanism underlying the spontaneous relaxor-ferroelectric phase transition of BKT through analyses of dielectric responses of high-quality ceramic samples fabricated via a hydrothermal process. We found that the transition was triggered by freezing of the thermal fluctuation of polar nanoregions existing in the relaxor phase. We also measured the dielectric responses of BKT under biasing electric field and uniaxial load. Based on these results, electric field-temperature and stress-temperature phase diagrams are firstly determined for BKT. We then fabricated solid solutions between BKT and strontium titanate (ST), (1-x)BKT-xST, to shift the dielectric maximum temperature of BKT toward room temperature. Consequently, 0.5BKT-0.5ST ceramics showed high dielectric permittivity exceeding 1000 in a wide temperature range up to 300°C.

  • Development of lead-free piezoelectric ceramics with mobility-controlled ferroelectric domains for high-temperature applications

    2013.08
    -
    2015.03

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity start-up, HAGIWARA Manabu, Grant-in-Aid for Research Activity start-up, Principal investigator

     View Summary

    For the high-temperature actuator applications of piezoelectric ceramics, it is necessary to control the mobility of ferroelectric domain walls. In this study, we firstly revealed the influence of dopant and grain size on the domain switching in BiFeO3-based lead-free piezoelectric ceramics with high Curie temperatures. In order to control the domain wall motions by introducing the inhomogeneous distribution of point defects in piezoelectric ceramics, we also tried to concentrate Mn ions near grain boundaries in BaTiO3 ceramics. It was demonstrated that the polarized state in the resulting ceramic was more stable than that in an undoped BaTiO3 ceramic.

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Courses Taught 【 Display / hide

  • SEMINAR IN APPLIED CHEMISTRY

    2024

  • NANO SCALE SCIENCE JOINT SEMINAR

    2024

  • MATERIAL SCIENCE 3

    2024

  • MATERIAL DESIGN SCIENCE JOINT SEMINAR

    2024

  • LABORATORIES IN APPLIED CHEMISTRY A

    2024

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Courses Previously Taught 【 Display / hide

  • 自然科学実験

    Keio University

    2014.04
    -
    2015.03

    Autumn Semester

  • 応用化学実験A

    Keio University

    2014.04
    -
    2015.03

    Spring Semester, Laboratory work/practical work/exercise

 

Memberships in Academic Societies 【 Display / hide

  • The American Ceramic Society, 

    2016.07
    -
    Present
  • The Japanese Sol-Gel Society, 

    2014.07
    -
    Present
  • The Ceramic Society of Japan, 

    2009.10
    -
    Present
  • The Japan Society of Applied Physics, 

    2009.01
    -
    Present

Committee Experiences 【 Display / hide

  • 2024.04
    -
    Present

    Editorial Board Members, Journal of the Ceramic Society of Japan, The Ceramic Society of Japan

  • 2023.04
    -
    Present

    Program Editorial Board Member, The Japan Society of Applied Physics

  • 2023.04
    -
    Present

    Event Planning Committee Member, The Ceramic Society of Japan

  • 2019.09
    -
    Present

    Session Organizer, Fall Meeting, The Ceramic Society of Japan