著者 Nanba, Tokuro| Nishimura, Mitsunori| Miura, Yoshinari|
発行日 2004-12-15
出版物タイトル Geochimica et Cosmochimica Acta
68巻
24号
資料タイプ 学術雑誌論文
著者 Nanba, Tokuro| Mikami, Shuhei| Imaoka, Takuya| Sakida, Shinichi| Miura, Yoshinari|
発行日 2008-02
出版物タイトル Journal of the Ceramic Society of Japan
116巻
1350号
資料タイプ 学術雑誌論文
著者 Nanba, Tokuro| Kuroda, Yutaro| Sakida, Shinichi| Benino, Yasuhiko|
発行日 2009-11
出版物タイトル Journal of the Ceramic Society of Japan
117巻
1371号
資料タイプ 学術雑誌論文
著者 難波 徳郎| 三浦 嘉也| 崎田 真一|
発行日 2005-01
出版物タイトル Journal of the Ceramic Society of Japan
113巻
1313号
資料タイプ 学術雑誌論文
著者 Omura, Kohei| Sakida, Shinichi| Benino, Yasuhiko| Nanba, Tokuro|
発行日 2013-03
出版物タイトル Journal of Asian Ceramic Societies
1巻
1号
資料タイプ 学術雑誌論文
著者 Saiki, Keiji| Sakida, Shinichi| Benino, Yasuhiko| Nanba, Tokuro|
発行日 2010-07
出版物タイトル Journal of the Ceramic Society of Japan
118巻
1379号
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/fest/19742
フルテキストURL 004_147_158.pdf
著者 陳 丹平| 渡辺 智大| 三浦 嘉也| 難波 徳郎|
抄録 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.
キーワード Photoconductivity Photovoltage Persistent photoconductivity CdO-Bi(2)O(3)-Al(2)O(3) glasses Electronic state
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1999-02-26
4巻
1号
開始ページ 147
終了ページ 158
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002309190
JaLCDOI 10.18926/15436
フルテキストURL Mem_Fac_Eng_OU_26_2_69.pdf
著者 Fujii, Tatsuo| Sakata Naoki| Nanba, Tokuro| Osaka, Akiyoshi| Miura, Yoshinari| Takada, Jun|
抄録 (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.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 69
終了ページ 75
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307639
JaLCDOI 10.18926/15473
フルテキストURL Mem_Fac_Eng_OU_26_2_61.pdf
著者 Osaka, Akiyoshi| Kawabata Kouji| Nanba, Tokuro| Takada, Jun| Miura, Yoshinari|
抄録 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.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 61
終了ページ 67
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307416
著者 崎田 真一| 増田 紘一| 難波 徳郎| 三浦 嘉也|
発行日 2006-12
出版物タイトル 環境制御
28巻
資料タイプ 紀要論文
JaLCDOI 10.18926/fest/11541
タイトル(別表記) Upconversion property and light scattering in Tm(3+)-doped glass-ceramics
フルテキストURL 007_119_125.pdf
著者 三浦 嘉也| 丁 勇| 村田 隆| 姫井 裕助| 難波 徳郎|
抄録 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.
キーワード Optical scattering Glass-ceramics Oxyfluoride glass Microcrystallite Upconversion fluorescence
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 119
終了ページ 125
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313480
著者 崎田 真一| 三上 修平| 難波 徳郎| 三浦 嘉也|
発行日 2007-10
出版物タイトル 環境制御
29巻
資料タイプ 学術雑誌論文
著者 崎田 真一| 三上 修平| 難波 徳郎| 三浦 嘉也|
発行日 2007-10
出版物タイトル 環境制御
29巻
資料タイプ 紀要論文
JaLCDOI 10.18926/fest/11475
タイトル(別表記) Material Recycling of Municipal Waste Slags by Using Phase Separation of Glass
フルテキストURL 012_161_165.pdf
著者 今岡 卓也| 崎田 真一| 難波 徳郎| 三浦 嘉也|
抄録 A novel recycling process of municipal waste slags obtaining Fe-free colorless materials was developed by using a phase separation of borosilicate glass. B(2)O(3) was added to a simulated waste slag to promote the phase separation. The slag glasses were heat-treated above glass transition temperatures, from which phase separation was successfully induced. The phase-separated slag glasses were still colored in black due to Fe ions, and after soaking in acid, they were successfully bleached, obtaining colorless solids. According to compositional analyses, no Fe ions were confirmed in the remaining insolubles, indicating that Fe ions were preferentially incorporated into the borate-rich phases soluble in acid. The main constituent of the colorless solids was SiO(2) and the end products obtained in the present process were expected as an alternative of pure silica glass.
キーワード slag recycling colorless glass phase separation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2007-03-15
12巻
1号
開始ページ 161
終了ページ 165
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313957
JaLCDOI 10.18926/fest/52229
タイトル(別表記) Material design for the ceramics coating with high mold releasability by using molecular orbital calculations
フルテキストURL fest_019_022_025.pdf
著者 難波 徳郎| 藤原 二朗| 崎田 真一| 紅野 安彦|
抄録  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
キーワード Material design Ceramic coating Releasability Molecular orbital calculation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2014-03
19巻
1号
開始ページ 22
終了ページ 25
ISSN 2187-6940
言語 Japanese
論文のバージョン publisher
NAID 120005394644
JaLCDOI 10.18926/fest/11614
タイトル(別表記) Preparation and Properties of ZnO Transparent Conductive Thin Films by Activated Reactive Evaporation Method
フルテキストURL 002_121_129.pdf
著者 藤原 貴| 藤井 達生| 難波 徳郎| 高田 潤| 三浦 嘉也|
抄録 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.
キーワード ZnO film Al doped ZnO transparent conductive film r.f. activated reactive evaporation method
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1997-01-10
2巻
1号
開始ページ 121
終了ページ 129
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313550
著者 崎田 真一| 黒田 龍介| 紅野 安彦| 難波 徳郎|
発行日 2009-12
出版物タイトル 環境制御
31巻
資料タイプ 紀要論文
著者 崎田 真一| 紅野 安彦| 難波 徳郎|
発行日 2012-02
出版物タイトル 環境制御
33巻
資料タイプ 紀要論文
JaLCDOI 10.18926/fest/11578
タイトル(別表記) Consideration for the correlation between basicity of oxide glasses and chemical shift of O1s binding energy in XPS
フルテキストURL 003_145_156.pdf
著者 難波 徳郎| 三浦 嘉也|
抄録 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.
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1998-01-14
3巻
1号
開始ページ 145
終了ページ 156
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313359
著者 崎田 真一| 難波 徳郎| 三浦 嘉也|
発行日 2008-12
出版物タイトル 環境制御
30巻
資料タイプ 学術雑誌論文