| JaLCDOI | 10.18926/fest/52229 |
|---|---|
| Title Alternative | Material design for the ceramics coating with high mold releasability by using molecular orbital calculations |
| FullText URL | fest_019_022_025.pdf |
| Author | Nanba, Tokuro| Fujihara, Jiro| Sakida, Shinichi| Benino, Yasuhiko| |
| Abstract | To explore the ceramic materials appropriate for the coatings with high mold releasability, molecular orbital (MO) calculations have been applied to the ceramics with NaCl structure, such as TiN, TiC, CrN, etc. Chemical bonding characters were evaluated based on the MO calculations, which were correlated to the experimental surface free energy. The dispersion and polar components of surface free energy indicated high correlation with the bond overlap population of the surface bonds and the net charge of inside atoms of the cluster models, respectively. Among the ceramic materials investigated, MoN had the lowest surface free energy, being expected to be most suitable as the ceramic coating material with high releasability |
| Keywords | Material design Ceramic coating Releasability Molecular orbital calculation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2014-03 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 22 |
| End Page | 25 |
| ISSN | 2187-6940 |
| language | 日本語 |
| File Version | publisher |
| NAID | 120005394644 |
| Author | Omura, Kohei| Sakida, Shinichi| Benino, Yasuhiko| Nanba, Tokuro| |
|---|---|
| Published Date | 2013-03 |
| Publication Title | Journal of Asian Ceramic Societies |
| Volume | volume1 |
| Issue | issue1 |
| Content Type | Journal Article |
| Author | Sakida, Shinichi| Benino, Yasuhiko| Nanba, Tokuro| |
|---|---|
| Published Date | 2012-02 |
| Publication Title | 環境制御 |
| Volume | volume33 |
| Content Type | Departmental Bulletin Paper |
| Author | Nanba, Tokuro| Miura, Yoshinari| Sakida, Shinichi| |
|---|---|
| Published Date | 2005-01 |
| Publication Title | Journal of the Ceramic Society of Japan |
| Volume | volume113 |
| Issue | issue1313 |
| Content Type | Journal Article |
| Author | Nanba, Tokuro| Mikami, Shuhei| Imaoka, Takuya| Sakida, Shinichi| Miura, Yoshinari| |
|---|---|
| Published Date | 2008-02 |
| Publication Title | Journal of the Ceramic Society of Japan |
| Volume | volume116 |
| Issue | issue1350 |
| Content Type | Journal Article |
| Author | Nanba, Tokuro| Kuroda, Yutaro| Sakida, Shinichi| Benino, Yasuhiko| |
|---|---|
| Published Date | 2009-11 |
| Publication Title | Journal of the Ceramic Society of Japan |
| Volume | volume117 |
| Issue | issue1371 |
| Content Type | Journal Article |
| Author | Saiki, Keiji| Sakida, Shinichi| Benino, Yasuhiko| Nanba, Tokuro| |
|---|---|
| Published Date | 2010-07 |
| Publication Title | Journal of the Ceramic Society of Japan |
| Volume | volume118 |
| Issue | issue1379 |
| Content Type | Journal Article |
| Author | Sakida, Shinichi| Kuroda, Ryusuke| Benino, Yasuhiko| Nanba, Tokuro| |
|---|---|
| Published Date | 2009-12 |
| Publication Title | 環境制御 |
| Volume | volume31 |
| Content Type | Departmental Bulletin Paper |
| Author | Nanba, Tokuro| Nishimura, Mitsunori| Miura, Yoshinari| |
|---|---|
| Published Date | 2004-12-15 |
| Publication Title | Geochimica et Cosmochimica Acta |
| Volume | volume68 |
| Issue | issue24 |
| Content Type | Journal Article |
| Author | Sakida, Shinichi| Mikami, Syuuhei| Nanba, Tokuro| Miura, Toshinari| |
|---|---|
| Published Date | 2007-10 |
| Publication Title | 環境制御 |
| Volume | volume29 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/fest/19742 |
|---|---|
| FullText URL | 004_147_158.pdf |
| Author | Chen, Danping| Watanabe, Tomohiro| Miura, Yoshinari| Nanba, Tokuro| |
| Abstract | Photo-induced phenomena such as photoconductive and photovoltaic effects were investigated for the glasses in CdO-Bi(2)O(3)-Al(2)O(3) system. Photoconductive effect was characterized by a slow decay of photocurrent (persitent photoconductivity). The decay rate decreased with increasing CdO content and decreasing Bi(2)O(3) content. Photovoltage was very small at room temperature but increased to an obvious value on heating. The photoconductivity and photovoltage were increased with CdO content and enhanced by heat treatment in air. The valence band spectra of X-ray photoelectron spectroscopy showed that the hybridization of Cd 4d and O 2p orbitals increases with decreasing Bi(2)O(3) content and increasing CdO content in the glasses. As the results maximum tends to flat. This type of band structure inhibits the rapid recombination of electrons and holes. The persistent photoconductivity of the glasses may be attributed to deep energy level of DX centers. Deep energy levels of the glasses are able to prevent the recombination because they have a repulsive barrier for both electron emission and capture. |
| Keywords | Photoconductivity Photovoltage Persistent photoconductivity CdO-Bi(2)O(3)-Al(2)O(3) glasses Electronic state |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 147 |
| End Page | 158 |
| ISSN | 1341-9099 |
| language | 英語 |
| File Version | publisher |
| NAID | 120002309190 |
| JaLCDOI | 10.18926/15473 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_2_61.pdf |
| Author | Osaka, Akiyoshi| Kawabata Kouji| Nanba, Tokuro| Takada, Jun| Miura, Yoshinari| |
| Abstract | Mullite-dispersed silica ceramics were prepared through sol-gel processing by the use of tetraethoxy silane, aluminium nitrate and aluminium isopropoxide as the Si and Al sources where HCl and HN0(3) were the catalyst. Effect of the starting materials, solvents and catalysts was examined on the gelation time or temperature of mullite precipitation. Apparent activation energy of gelation ranged from 80 to 95kJ/mol. The presence of AI in the sols elongated the gelling time suggesting the formation of chelate bonds between AI and Si-OR or Si-OH bonds. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1992-03-28 |
| Volume | volume26 |
| Issue | issue2 |
| Start Page | 61 |
| End Page | 67 |
| ISSN | 0475-0071 |
| language | 英語 |
| File Version | publisher |
| NAID | 120002307416 |
| JaLCDOI | 10.18926/15436 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_2_69.pdf |
| Author | Fujii, Tatsuo| Sakata Naoki| Nanba, Tokuro| Osaka, Akiyoshi| Miura, Yoshinari| Takada, Jun| |
| Abstract | (001)-oriented Ti(2)O(3) films were epitaxially grown on a(001)-face of sapphire single-crystalline substrate by an activated reactive evaporation method. The formation ranges of stoichiometric and nonstoichiometric Ti(2)O(3) films were determined as a function of the substrate temperature (Ts), the oxygen pressure (Po(2)) and the deposition rate. Stoichiometric Ti(2)O(3) films were grown at Ts≧673K under Po(2)≧1.0×10(-4)Torr, which showed the metal-insulator transition with a sharp change in electrical resistivity from 3.5×10(-2) to 2.6×10(-3)Ωcm at 361K. Nonstoichiometric films prepared under less oxidized conditions did not exhibit the transition. The nonstoichiometry of the Ti(2)O(3)films was discussed in terms of excess Ti ions. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1992-03-28 |
| Volume | volume26 |
| Issue | issue2 |
| Start Page | 69 |
| End Page | 75 |
| ISSN | 0475-0071 |
| language | 英語 |
| File Version | publisher |
| NAID | 120002307639 |
| Author | Sakida, Shinichi| Masuda, Koichi| Nanba, Tokuro| Miura, Yoshinari| |
|---|---|
| Published Date | 2006-12 |
| Publication Title | 環境制御 |
| Volume | volume28 |
| Content Type | Departmental Bulletin Paper |
| Author | Sakida, Shinichi| Mikami, Syuuhei| Nanba, Tokuro| Miura, Yoshinari| |
|---|---|
| Published Date | 2007-10 |
| Publication Title | 環境制御 |
| Volume | volume29 |
| Content Type | Journal Article |
| Author | Sakida, Shinichi| Nanba, Tokuro| Miura, Yoshinari| |
|---|---|
| Published Date | 2008-12 |
| Publication Title | 環境制御 |
| Volume | volume30 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/fest/11614 |
|---|---|
| Title Alternative | Preparation and Properties of ZnO Transparent Conductive Thin Films by Activated Reactive Evaporation Method |
| FullText URL | 002_121_129.pdf |
| Author | Fujiwara, Takashi| Fujii, Tatsuo| Nanba, Tokuro| Takada, Jun| Miura, Yoshinari| |
| Abstract | Zinc oxide films were prepared on silica glass substrates by the use of an r.f. activated reactive evaporation (ARE) method, and were examined by X-ray diffraction (XRD) and scanning electron microscope (SEM). The electrical conductivity of the films and the doping effect of Al ions were also investigated. XRD measurements indicate that the films were c-axis oriented and that an r.f. plasma of Zn and O was necessary for the ZnO film deposition. Substrate temperature, oxygen gas pressure, evaporation rate, r.f. power and Al doping amount affect the c-axis orientation, the growth rate, the microstructure of the films and electrical conductivity. Optimum conditions with a fine texture of the surface and having good ctystallinity as well as good conductivity (≒10(-4)Ω・cm) were as follows : the substrate temperature; 200℃, the total evaporation rate; 1.0Å/s, the oxygen pressure; 2.0×10(-4) Torr, the r.f. power; 250W and the Al evaporation rare ratio; 2～6%. The films with 1.0×10(-3)Ω・cm were prepared at 50℃ for the substrate temperature. |
| Keywords | ZnO film Al doped ZnO transparent conductive film r.f. activated reactive evaporation method |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 129 |
| ISSN | 1341-9099 |
| language | 日本語 |
| File Version | publisher |
| NAID | 120002313550 |
| JaLCDOI | 10.18926/fest/11578 |
|---|---|
| Title Alternative | Consideration for the correlation between basicity of oxide glasses and chemical shift of O1s binding energy in XPS |
| FullText URL | 003_145_156.pdf |
| Author | Nanba, Tokuro| Miura, Yoshinari| |
| Abstract | Binding energy of O1s core electron measured in XPS is a candidate to determine new scale of Lewis basicity of oxide ion in glass. Some mathematical expressions for the basicity or XPS chemical shift, such as charge parameter and optical basicity, are compared with experimental O1s binding energy in binary alkali oxide glasses. The expressions so far in use need some modification in parameters. A new empirical expression introduced in this paper gives new concept and universal scale of basicity. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 145 |
| End Page | 156 |
| ISSN | 1341-9099 |
| language | 日本語 |
| File Version | publisher |
| NAID | 120002313359 |
| JaLCDOI | 10.18926/fest/11541 |
|---|---|
| Title Alternative | Upconversion property and light scattering in Tm(3+)-doped glass-ceramics |
| FullText URL | 007_119_125.pdf |
| Author | Miura, Yoshinari| Ding, Yong| Murata, Takashi| Himei, Yusuke| Nanba, Tokuro| |
| Abstract | Glass-ceramics containing Pb(x)Cd(1-x)F(2) microcrystallites were prepared through heat treatment of Tm(3+)/Yb(3+)doped SiO(2)-Al(2)O(3)-PbF(2) glasses. The crystallite size was controlled by varying the heat-treatment time. By changing glass composition, two types of strong optical scattering, Rayleigh and Mie scattering modes were observed for the glass ceramics. In the case of Rayleigh scattering, the scattering region expanded to the long-wavelength side with increasing the heat-treatment time. On the other hand, in the case of Mie scattering, the region were hardly dependent on wavelength, and visible light was widely scattered. It was argued that the different scattering phenomena were caused by the different size of the crystallites or their morphogical texture. Furthermore, the glass-ceramics with strong optical scattering showed higher upconversion fluorescence intensity than the matrix glass. The mechanisms for the enhanced upconversion due to the scattering were discussed. |
| Keywords | Optical scattering Glass-ceramics Oxyfluoride glass Microcrystallite Upconversion fluorescence |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2002-03-22 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 119 |
| End Page | 125 |
| ISSN | 1341-9099 |
| language | 日本語 |
| File Version | publisher |
| NAID | 120002313480 |
| JaLCDOI | 10.18926/fest/11538 |
|---|---|
| Title Alternative | Effects of ultrasonic treatment on the preparation of transparent glass-ceramic phosphor |
| FullText URL | 007_113_118.pdf |
| Author | Inoue, Teruhide| Nakashima, Mizuho| Nanba, Tokuro| Miura, Yoshinari| |
| Abstract | The effects of ultrasonic surface treatment (UST) on the crystallization behavior and optical emission properties were investigated for the transparent glass-ceramics prepared from calcium aluminosilicate glasses co-doped with Eu(2+), Nd(3+). The glass-ceramics A were prepared by sintering a glass 45CaO・45Al(2)O(3)・10SiO(2) (mol%) containing 0.5Eu(2)O(3)+1Nd(2)O(3) under a 2% H(2)+98% Ar reducing atmosphere. In the glass-ceramics A, three crystalline phases, CaAl(2)O(4) (CA), CaAl(4)O(7) (CA2) and Ca(2)Al(2)SiO(7) (CAS) were commonly confirmed by X-ray diffraction. No drastic change in the amount of the precipitated crystalline phases was observed even in the case using UST of CA powders. It was suggested that the optical emission properties of the glass-ceramics A was responsible for the CA2 crystals. The glass-ceramics B were also prepared from a 51CaO・42Al(2)O(3)・7SiO(2) glass. The CA crystals were separately precipitated in the glass-ceramics B. In particular, a large amount of CA was successfully produced by stirring the UST suspension to prevent the sedimentation of the UST particles. The glass-ceramic B so-prepared showed strong photoluminescence but weak phosphorescence compared with other glass-ceramics B, indicating that the photoluminescence and phosphorescence were originated in different electron-trapping levels. The amount of the trap levels associated with the long lasting phosphorescence, such as oxygen vacancies, was probably small in the glass-ceramic B prepared with the stirring UST. |
| Keywords | ultrasonic surface treatment (UST) surface crystallization glass-ceramics long lasting phosphorescence calcium aluminosilicate glass |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2002-03-22 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 113 |
| End Page | 118 |
| ISSN | 1341-9099 |
| language | 日本語 |
| File Version | publisher |
| NAID | 120002313433 |
