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  2. Uchida Hiroshi

Uchida Hiroshi

  (内田 寛)

Profile Information

Affiliation
Professor, Faculty of Science and Technology, Department of Materials and Life Sciences, Sophia University
Degree
修士（工学）(Mar, 1997, 上智大学)
博士（工学）(Jan, 2001, 東京工業大学)
Contact information
uchidahsophia.ac.jp
Researcher number
60327880
J-GLOBAL ID
200901055907958881
researchmap Member ID
1000367338

Apr. 2000 - present
Department of Chemistry, Sophia University (Research Associate)
(i) "Material-research for novel ferroelectric thin films applicable to nonvolatile random access memories" (Apr. 2000 -)
(ii) "Development of novel film-deposition techniques using supercritical fluids" (Apr. 2003 -)
[Supervisor: Prof. Isao Okada (Apr. 2000 - Mar. 2003), Prof. Seiichiro Koda (Apr. 2003 -)]

Apr. 1997 - Mar. 1999
Department of Inorganic materials, Tokyo Institute of Technology (Doctorial research)
(i) "Study on Residual Stress Analysis and Effect of the Stress on Dielectric Properties of Ferroelectric Lead Titanate Thin Film"
[Supervisor: Prof. Nobuyasu Mizutani]

Apr. 1995 - Mar. 1997
Department of Applied Chemistry, Sophia University (Master research)
(i) "Study on nitride ceramics of ternary Mg-Si-N system with high thermal conductivity"
[Supervisor: Prof. Akira Kishioka]

(Subject of research)
Fabrication and Evaluation of Ferroelectric Thin Films by Chemical Solution Deposition
Development of lead-free ferroelectirc thin films
Chemical process for synthesis of inorganic materials using supercritical fluids
Hydrothermal synthesis of metal-oxide thin films

Research Interests

 9

Research Areas

 3

Research History

 6
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Education

 3

Papers

 204
  • H Uchida, K Itatani, M Aizawa, FS Howell, A Kishioka
    ADVANCED POWDER TECHNOLOGY, 10(2) 133-143, 1999  Peer-reviewed
    Magnesium silicon nitride (MgSiN2) powder was prepared by carbothermally reducing a magnesium metasilicate whose chemical composition corresponded to MgO . SiO2 or MgSiO3. About 0.2 g of the powder mixture of magnesium metasilicate and carbon (C) with the molar ratio of C to MgO . SiO2 equal to 6.0 was heated at 1250 degrees C for 7 h in nitrogen atmosphere. The crystalline phase of the carbothermally reduced powder was only MgSiN2. The residual carbon could be removed by heating the powder at 600 degrees C for 1 h in air. The yield of MgSiN2 powder was similar to 70%. The resulting powder contained 3.22 mol% oxygen. The primary particle sizes were ranging from 0.1 to 0.5 mu m.
  • Ian J. Davis, Hiroshi UCHIDA, Mamoru AIZAWA, Kiyoshi ITATANI
    Inorganic materials, 6(278) 40-47, Jan, 1999  Peer-reviewed
  • Wu, T.-J., Uchida, H., Sakurai, O., Wakiya, N., Funakubo, H., Shinozaki, K., Mizutani, N.
    Key Engineering Materials, 169 123-126, 1999  Peer-reviewed
  • Hiroshi UCHIDA, Kiyoshi ITATANI, Mamoru AIZAWA, Frank Scott HOWELL, Akira KISHIOKA
    Journal of the Ceramic Society of Japan, 105(1227) 934-939, Nov, 1997  Peer-reviewed
    Magnesium silicon nitride (MgSiN_2) was synthesized by the nitridation of powders in the magnesium (Mg) -silicon (Si) system. Although an Mg and Si powder with an Mg/Si ratio of 1.0 ( = stoichiometric ratio of MgSiN_2) was heated up to 1400℃ in nitrogen (N_2) , a single phase of MgSiN_2 could not be obtained, due to evaporation of Mg during heating. On the basis of the information that Mg_2Si formed as an intermediate phase during the synthesis of MgSiN_2, an Mg_2Si powder was heated at a temperature between 600 and 1600℃ for 1h in N_2. Although MgSiN_2 and other phases such as Si and amorphous Mg_3N_2 were present in the temperature range of 900℃ to 1300℃, the powder heated at 1400℃ consisted of only MgSiN_2 phase. The chemical composition of the powder heated at 1400℃ for 1h was almost stoichiometric; the content of the oxygen was as low as 0.76 mol%. The powder consisted of agglomerates with sizes of 〜5μm; these agglomerates were furthermore composed of primary particles with an average size of 0.54 μm. The oxidation resistant temperature of MgSiN_2 was estimated to be 〜830℃. The MgSiN_2 powder had good resistivity to hydration.

Misc.

 54
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Books and Other Publications

 5

Presentations

 92
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Professional Memberships

 5

Research Projects

 20
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Industrial Property Rights

 8
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