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  • 1
    Digitale Medien
    Digitale Medien
    EPR spectra of lead(3+) and silver(0) in glass (1980)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 84 (1980), S. 2316-2319 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100455a021
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  • 2
    Digitale Medien
    Digitale Medien
    Fourier transform infrared attenuated total reflection spectra of ion-implanted silica glasses (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 8079-8082 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Fourier transform infrared attenuated total reflection spectra of silica glasses implanted with Si or P were measured using a Ge as an internal reflection element. Calculated penetration depth of the infrared radiation is 0.2–1.0 μm depending on the wavelength. These values are comparable to the depths of ions implanted at conventional acceleration voltages. Upon implantation the frequencies of ω4(LO) and ω4(TO) shifted to lower energy, whereas ω3 moved to higher energy. This opposite direction of the frequency shift was explained by a decrease in the Si-O-Si bridging angle, which is caused by ion-bombarded compaction. The magnitude of frequency shifts observed were much larger than that in thermally compacted silica glasses reported so far, showing that an extremely high fictive temperature state is realized in the implanted silica glass layers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348925
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  • 3
    Digitale Medien
    Digitale Medien
    Ion-beam doping of silver in amorphous As2S3 thin films (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1821-1824 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Double layers of metallic Ag/amorphous (a-)As2S3 on silica substrates were irradiated with 300 keV He+ ions to examine doping of Ag+ into a-As2S3 by dense electronic excitation. The irradiating ions passed through the double layers and came to rest in the silica substrates. Thus, energy deposition from energetic He+ ions into the double layers was completely almost due to electronic processes (99.4%). Ionized silver found to diffuse into a-As2S3 as a result of electronic excitation by ion-beam irradiation. Rutherford backscattering spectroscopy revealed that the highest concentration of silver doped into a-As2S3 was 35 at. %. When the resulting Ag-doped a-As2S3 was illuminated by band gap light, photo-surface-deposition of metallic silver particles, which was not observed for Ag photo-doped specimens, was observed. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1492862
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  • 4
    Digitale Medien
    Digitale Medien
    Electronic structure and optoelectronic properties of transparent p-type conducting CuAlO2 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4159-4163 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Electrical and optical properties of CuAlO2, a p-type conducting transparent oxide, were examined for the thin films prepared by the pulsed laser deposition technique. The indirect and direct allowed optical band gaps were evaluated to be ∼1.8 and ∼3.5 eV, respectively. The conductivity at 300 K was ∼3×10−1 S cm−1 and its temperature dependence is of the thermal-activation type (activation energy (approximate)0.2 eV) at temperatures 〉220 K but is of the variable-range hopping type (log σ∝T−1/4) at 〈220 K. It was inferred that an admixed state of Cu 3d and O 2p primarily constitutes the upper valence band, which controls transport of positive holes, from a combined information on ultraviolet photoemission spectrum with x-ray photoemission spectrum. An energy band calculation by full-potential linearized augmented plane wave method substantiated the experimental findings. The present results gave a solid basis for our working hypothesis [Nature (London) 389, 939 (1997)] for chemical design of p-type conducting transparent oxides. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1308103
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  • 5
    Digitale Medien
    Digitale Medien
    Preparation of n-type conductive transparent thin films of AgInO2:Sn with delafossite-type structure by pulsed laser deposition (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 3067-3069 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Sn-doped AgInO2 thin films were prepared on α-Al2O3(0001) single-crystal substrates by pulsed laser deposition. The films prepared under optimized conditions have high optical transmittance up to the near-ultraviolet region and high electrical conductivity. The optical band gap was estimated to be ∼4.1 eV, and electrical conductivity was 7.3×101 S cm−1 at 300 K. The carrier concentration and Hall mobility at 300 K were 3.3×1020 cm−3 and 1.4 cm2 V−1s−1, respectively. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1287404
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  • 6
    Digitale Medien
    Digitale Medien
    ArF excimer laser irradiation effects in AlF3-based fluoride glasses for vacuum ultraviolet optics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3038-3043 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Color center formation in AlF3–YF3–RF2 (R=alkaline earth metal) glasses doped with PO2.5 (0–3 mol %) by irradiation with ArF excimer laser light was examined by optical absorption (vacuum ultraviolet–visible) and electron paramagnetic resonance (EPR) spectroscopies. Concentrations of impurity iron in all the glasses and oxygen in the P-free samples were ∼0.2 and ∼450 ppm, respectively. Optical absorption ranging from 2–8 eV was induced via one-photon absorption processes. The optical band dominating the transmission loss at 193 nm has a peak at 5 eV in the P-free glasses or a peak at 6.9 eV in the P-doped glasses. The origins of the 5 and 6.9 eV bands were tentatively ascribed to an oxygen-related hole center giving an EPR signal with a width of 7.2 mT at g=2.0097 and P E′ center giving a hyperfine doublet with a separation of ∼70 mT. Provided these correspondences, then the values of oscillator strength for the 5 and 6.9 eV bands were calculated as ∼0.15 and ∼0.1, respectively. No formation of color centers associated with intrinsic constituents such as Al, Y, R, and F ions, was observed. The present results suggest that the reduction of impurity oxygen content is a route to effectively suppress the solarization in the P-free AlF3-based glasses. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369640
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  • 7
    Digitale Medien
    Digitale Medien
    Band gap engineering, band edge emission, and p-type conductivity in wide-gap LaCuOS1−xSex oxychalcogenides (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4768-4770 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The preparation of LaCuOS1−xSex solid solutions (x=0.0, 0.25, 0.5, 0.75, and 1.0) was attempted to control their energy gap and band edge emission energy. X-ray diffraction analysis revealed that the lattice constant of LaCuOS1−xSex increased linearly with increasing x, indicating the formation of a complete solid solution in the LaCuOS–LaCuOSe system. The energy gap estimated from the diffuse reflectance spectra varied continuously from ∼3.1 eV for x=0 to ∼2.8 eV for x=1. The sharp emission near the absorption edge was observed in all samples at room temperature under ultraviolet light irradiation. p-type electrical conduction in these materials was confirmed by Seebeck measurements, and the conductivity was enhanced by substitution of Sr for La. These results demonstrated that the formation of the solid solutions enabled band gap engineering in LaCuOS1−xSex oxychalcogenides keeping their band edge emission feature and p-type conductivity. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1456240
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  • 8
    Digitale Medien
    Digitale Medien
    Photochemistry in phosphorus-doped silica glass by ArF excimer laser irradiation: Crucial effect of H2 loading (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4121-4124 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A striking difference in photochemistry induced by ArF excimer laser irradiation was found between H2-unloaded and H2-loaded P-doped SiO2 glasses. Although a pair of phosphorus-electron center and phosphorus-oxygen-hole center (POHC) were produced in the former, PHO2 (pyramidal shape) and PO2 (planar) centers were created instead of the POHC in the latter. The present finding strongly suggests that H2 loading treatment of P-doped SiO2 at ambient temperature induces a drastic structural alternation around phosphorus, leading to new precursor structures which account to the photosensitivity of the materials. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1456253
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  • 9
    Digitale Medien
    Digitale Medien
    Long lasting phosphorescence and photostimulated luminescence in Tb-ion-activated reduced calcium aluminate glasses (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3729-3733 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Long lasting phosphorescence (LLP) and photostimulated luminescence (PSL) were found in reduced calcium aluminate glasses activated with Tb3+ ions. The LLP from Tb3+ was observed by illuminating the Tb3+ 4f→5d charge transfer band with ultraviolet (UV) 254 nm light, while the PSL was seen by stimulating the UV-illuminated glasses with 633 nm light. The decay curve of the LLP was fitted with a second-order kinetic for the initial period (0〈t〈20 min) and a first-order kinetic for the later (t〉30 min). An electron paramagnetic resonance (EPR) signal, which is attributed to an F+-like center associated with Ca2+ ions, was induced by illumination with UV light and its intensity decay was fitted with a first-order kinetic similarly to the later stage of the LLP. The appearance of the PSL by illumination is accompanied by a distinct intensity reduction of the EPR signal due to the F+-like center. The thermoluminescence spectra of the specimen illuminated with UV light at 77 K consist of two components peaking at ∼240 and ∼390 K. The low temperature component and the high temperature component were attributed to an F-like center and an F+-like center, respectively. These results lead to a conclusion that electrons of the F-like center and the F+-like center contribute predominantly to the emergence of the LLP and the PSL, respectively. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.371243
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  • 10
    Digitale Medien
    Digitale Medien
    Origin of the Red Color of Satsuma Copper-Ruby Glass as Determined by EXAFS and Optical Absorption Spectroscopy (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: The origin of the ruby color of Satsuma glass, a famous copper-ruby glass produced in Japan in the mid-19th century, has been examined by electron microprobe analysis (EPMA), X-ray absorption fine structure (XAFS), and optical absorption spectroscopy analyses. CuK XAFS analysis reveals that the major component of copper in the ruby glass consists of Cu(I) ions in the glass structure. This species is distinct from Cu2O (cuprite), which we conclude is not responsible for the ruby color. Optical absorption spectra measured at 300 and 77 K clearly distinguishes the absorptions due to the colloidal particles of metallic copper and Cu2O. It is concluded that the trace amount of copper in the ruby glass, which is below the detection limit of the EPMA and XAFS techniques, exists as metallic copper particles of nanometer size and is responsible for the ruby-red appearance of the Satsuma glass.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01818.x
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