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
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 10.18926/15486
FullText URL Mem_Fac_Eng_OU_25_1_23.pdf
Author Miura, Yoshinari| Takada, Jun| Osaka, Akiyoshi| Kawamura, Toshio|
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 micrograph (SEM). 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 inlet position of oxygen gas effect the c-axis orientation, the growth rate and the microstructure of the films. Optimum conditions for a dense film with a fine texture of the surface and having good crystallinity were as follows: the substrate temperature;400℃, the evaporation rate;5.0(A)/s, the oxygen pressure;2.0x10(-4) Torr, the r.f. power;150 to 200W, and the oxygen gas inlet near the substrate. For the film prepared under the optimum conditions, the standard deviation σ of the rocking curve for the (002) diffraction was 1.9deg, smaller than that of the film prepared by using an r.f. sputtering method.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1990-12-14
Volume volume25
Issue issue1
Start Page 23
End Page 35
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307600
JaLCDOI 10.18926/15474
FullText URL Mem_Fac_Eng_OU_24_1_53.pdf
Author Osaka, Akiyoshi| Takao Seiji| Oda, Kiichi| Takada, Jun| Miura, Yoshinari|
Abstract Electrical resistance and X-ray photoelectron depth profile analysis are studied for antimony doped tin oxide films developed on silica, alkali-free and sodalime slide glass substrates. The sodium ions diffused from the substrates to the films prevented the crystal growth of rutile type tin oxide in the film, resulting in the high electrical resistance. A diffusion layer has been detected for each film with diffuse profiles of multi valent cations (Sn, Si or Ca) at the interface of the tin oxide film and substrate. A greater amount of sodium atoms have been detected in the film developed on the soda-lime glass while almost no sodium atoms have been found in those on the other substrates. This can be explained by the diffusion of the sodium ions in the substrate due to a drastic hydronium-sodium exchange mechanism under highly acidic conditions during the dipping and drying processes.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1989-11-29
Volume volume24
Issue issue1
Start Page 53
End Page 61
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307279
JaLCDOI 10.18926/15464
FullText URL Mem_Fac_Eng_OU_28_2_77.pdf
Author Osaka, Akiyoshi| Kawamura Haruyuki| Miura, Yoshinari|
Abstract Amorphous films of lead oxyfluorosilicate were prepared with a rf-sputtering technique, and the distribution profiles of the component elements and chemical states of the fluoride ions were analyzed with an X-ray photoelectron spectrometer. Si atoms with an expanded coordination, O(4)Si-F, were present near the surface, and O(3)Si-F units were present in the deeper part of the films. Electrical resistance indicated transition to a conduction state for the films containing fluoride ions, while the films were crystallized to precipitate low quartz by the irradiation of He-Ne laser of 3 mW up to 1 sec.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1994-03-15
Volume volume28
Issue issue2
Start Page 77
End Page 84
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307766
JaLCDOI 10.18926/15462
FullText URL Mem_Fac_Eng_OU_23_1_39.pdf
Author Osaka, Akiyoshi| Yuasa Motokazu| Miura, Yoshinari| Takahashi, Katsuaki|
Abstract Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O (wt%) were prepared from hydrolysis and polycondensation of metal alkoxides under the HCl catalysis. Variation of specific surface area and porosity with temperature indicated that closed pores were opened below 400℃, and collapsed above 450℃ after the porosity reached a maximum value around 450℃. The structural evolution was examined due to IR spectra and a phase separation in the gels was observed. The solubility of the gels into 1N-HCl was studied as a function of the treatment temperature.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1988-11-22
Volume volume23
Issue issue1
Start Page 39
End Page 48
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307518
JaLCDOI 10.18926/15459
FullText URL Mem_Fac_Eng_OU_23_1_31.pdf
Author Miura, Yoshinari| Yuasa Motokazu| Osaka, Akiyoshi| Takahashi, Katsuaki|
Abstract Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O(wt%) were prepared from hydrolysis and polycondensation of tetraethyl orthosilicate, trimethyl borate, and sodium methylate under the HCl catalysis. Variation of the gelation time is examined as a function of the mixing ratio of the starting materials and the catalyst. The thermal behavior of the gels has been discussed on the basis of their TG and DTA traces.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1988-11-22
Volume volume23
Issue issue1
Start Page 31
End Page 38
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307464
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/11645
Title Alternative Selective reduction of nitrogen oxide with propylene on alumina-zirconia prepared from Al chelate compound and Zr alkoxide
FullText URL 001_199_204.pdf
Author Kawabata, Koji| Yoshimatsu, Hideyuki| Yabuki, Tatsumi| Osaka, Akiyoshi| Miura, Yoshinari|
Abstract An alumina-zirconia (AZ) composite powder was prepared by thermal decomposition of the organic precursors, which were synthesized from ethyl acetoacetate aluminium diisopropylate and zirconium n-butoxide. Specific surface area of AZ was higher than that of alumina-zirconia (ALK) prepared from aluminium sec-butoxide and zirconium nbutoxide. True density of AZ was lower than that of ALK. Selective reduction of nitrogen oxide with propylene in oxygen-rich atmosphere on AZ was superior to that on ALK.
Keywords Al chelate compound Zr alkoxide alumina-zirconia specific surface area true density selective reduction of nitrogen oxide
Publication Title 岡山大学環境理工学部研究報告
Published Date 1996-03
Volume volume1
Issue issue1
Start Page 199
End Page 204
ISSN 1341-9099
language 日本語
File Version publisher
NAID 110002291536
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
JaLCDOI 10.18926/fest/11476
Title Alternative Evaluation of Surface State of Ceramic Particles Suspended in Aqueous Solution by Potentiometric Titration Method
FullText URL 009_153_162.pdf
Author Miura, Yoshinari| Nanba, Tokuro| Shinoda, Masakatsu|
Abstract Surface states of ceramic particles such as SiO(2), Al(2)O(3), Si(3)N(4) and so on suspended in aqueous alkaline solutions were successfully and easily determined by a potentiometric titration method. Isoelctric point, iep and excess surface charge density were classified and evaluated for many ceramic particles from the view points of aggregation and dispersion of particles and solubility in aqueous solution.
Keywords potentiometric titration method isoelctric point excess surface charge density ceramic particle suspension aqueous solution
Publication Title 岡山大学環境理工学部研究報告
Published Date 2004-02-27
Volume volume9
Issue issue1
Start Page 153
End Page 162
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313753
JaLCDOI 10.18926/fest/11475
Title Alternative Material Recycling of Municipal Waste Slags by Using Phase Separation of Glass
FullText URL 012_161_165.pdf
Author Imaoka, Takuya| Sakida, Shinichi| Nanba, Tokuro| Miura, Yoshinari|
Abstract 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.
Keywords slag recycling colorless glass phase separation
Publication Title 岡山大学環境理工学部研究報告
Published Date 2007-03-15
Volume volume12
Issue issue1
Start Page 161
End Page 165
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313957