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  • Articles: DFG German National Licenses  (34)
  • Electronic Resource  (34)
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  • Articles: DFG German National Licenses  (34)
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  • Electronic Resource  (34)
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  • 1
    Electronic Resource
    Electronic Resource
    Optical Properties of Er-Doped Al2O3–SiO2 Films Prepared by a Modified Sol–Gel Process (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Er-doped Al2O3–SiO2 (1/9 in mol ratio of Al2O3/SiO2) thin films were prepared by using a modified sol–gel process. The modified process entails the precipitation and digestion of Er(OH)3, obtained from the reaction between Er ions and NH4OH in solution. Thin films were deposited on Si wafers by using a spin coating technique (3000 rpm) and the coated films were heat treated at different temperatures for 1 h in an oxygen-purged furnace. All the films were structurally characterized by the X-ray diffraction technique using CuKα radiation. Refractive indices and the morphologies of the films were studied using a spectroscopic phase modulated ellipsometer and atomic force microscopy, respectively. It was observed that the films were crack free and of about 0.4 μm thickness in a single spin coating and both the lifetime and the photoluminescence intensity of Er ions increased with increasing the annealing temperature. The luminescence properties of the Er-doped Al2O3–SiO2 made by a conventional and our modified doping process were compared and discussed from the stand point of peak intensities and lifetimes as a function of annealing temperatures. It is to be noted here that our modified process was found to be more effective in reducing the clustering of Er ions in Al2O3–SiO2 materials as compared to that of the conventional method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00454.x
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  • 2
    Electronic Resource
    Electronic Resource
    Tunable wavelength filters with Bragg gratings in polymer waveguides (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2543-2545 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tunable wavelength filters are demonstrated based on the thermo-optic refractive index change of the polymer waveguide with Bragg reflection grating. For the low-loss waveguide operating around 1.55 μm, fluorinated polymers are incorporated. Bragg reflection gratings are fabricated using a phase mask and a high-index polymer. The Bragg reflector exhibits a narrow bandwidth of less than 1.0 nm, a crosstalk of −20 dB, an insertion loss of 3.2 dB, and a flat-top passband. The peak wavelength of Bragg reflection is shifted over 11 nm with a slight insertion loss change. The thermo-optic tuning efficiency is 22 nm/W and the peak shift is linearly proportional to the heating power. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122527
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  • 3
    Electronic Resource
    Electronic Resource
    Polymeric wavelength filters with polymer gratings (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 1559-1561 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Wavelength filters with Bragg gratings are demonstrated based on low-loss polymer waveguides and high-refractive-index polymer gratings. Two kinds of fluorinated polymers, perfluorocyclobutane and fluorinated poly(arylene ethers) are used for the low-loss waveguide operating around the 1.55 μm wavelength. The polymer grating is made of Resole, and it is successfully integrated in the polymer waveguides. In order to fabricate the Bragg gratings on the polymer waveguides, we use a phase mask and a Hg lamp in a mask aligner as the illuminating source instead of the laser. This method provides uniform gratings on a large area as well as the alignment capability. In the fabricated wavelength filters, the reflectivity at the Bragg wavelength is 30 dB, the 3 dB bandwidth is as narrow as 0.6 nm, and the insertion loss is 3.7 dB. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121114
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanical Properties of Tape-Cast Alumina-Glass Dental Composites (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Alumina-glass dental composites were prepared by tape casting and sintering at 1120°C, followed by glass infiltration at 1100°C. Flexural strength and fracture toughness of the composites were investigated in terms of the influence of tape constituents, namely, alumina powder, binder, and plasticizer, on the mechanical properties. Both strength and toughness increased with increasing alumina fraction in tapes and decreased with increasing binder content in binder/plasticizer mixtures. These observations were consistent with the influence of the constituents on mean alumina particle distance in tapes, suggesting that the high strength of glass-infiltrated alumina composites is related to toughening by crack bowing. The strength and fracture toughness of the tape-cast composites, optimized for forming dental crowns, were 508 MPa and 3.1 MPa·m1/2, respectively, obtained from biaxial tests. Shrinkage of the composites decreased with increasing thermocompression pressure, applied to the tapes prior to sintering, and heating rate to the sintering temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb02219.x
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of the Weak Absorption Tail on the Transmission Loss of Ge–Sb–Se Optical Fibers (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Selenide glass optical fibers were fabricated for Ge30Sb10Se58S2 and Ge20Sb10Se70 glasses. Their transmission loss has been measured and compared with the theoretical attenuation loss that was calculated taking into account the electronic transition absorption, Rayleigh scattering, and multiphonon absorption. A low attenuation loss of the Ge20Sb10Se70 glass composition in 1.2–1.7 μm range has been expected due to its high optical band gap energy compared with the Ge30Sb10Se58S2 glass. However, the measured attenuation loss of the Ge30Sb10Se58S2 glass fiber was ∼13 dB/m at 1.5 μm while Ge20Sb10Se70 glass showed ∼82 dB/m. An enhanced weak absorption tail due to the localized states of the Ge20Sb10Se70 glass was responsible for this behavior. Structural defects are related to the localized states and discussed for the present glass compositions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00300.x
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and properties of nonlinear optical polymers based on poly(ether imides) for electrooptical devices (1999)
    Springer
    Polymer bulletin 42 (1999), S. 403-409 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary : Nonlinear optical poly(ether imides) with an adequate thermal stability has been synthesized by direct coupling of hydroxy poly(ether imides) and NLO chromophores with a quantitative yield. The resultant amorphous NLO poly(ether imides) exhibited good solubility in common organic solvents, providing optical-quality thin films by spin coating. The glass transition temperatures of the polymers are at around 180 °C. The electrooptic coefficients (r33, @1.3μm) of PEI-DR1 was 12.3 pm/V with an electrical poling field of 100 V/μm and it decayed about 10 % over 10 months at 90 °C under atmospheric conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050482
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  • 7
    Electronic Resource
    Electronic Resource
    Preformed Laminating Veneer Porcelain Using Paste System for Fabrication of PFM Crowns (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 937-940 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Feldspathic porcelain paste system using organic vehicle was prepared and applied to fabricate the porcelain fused to metal fixed partial denture. The mean linear fired shrinkage of paste porcelain system was 15.2% that is 0.8% lower than that of conventional build-up method. The color difference between two methods (??E*) was 0.156. Mean biaxial flexural strength of sintered preformed laminating porcelains of this system and conventionally build-up porcelains were 74±3and 70±4 MPa respectively. There was no deterioration of physical properties of feldspathic porcelain system by introducing organic vehicle, and this new build-up method can be applied to fabricate the porcelain fused to metal restorations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.937.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Application of Taguchi Method for Optimization of Vacuum Plasma Sprayed CoNiCrAlY Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1549-1552 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Bond coatings, CoNiCrAlY, are prepared on Inconel 738 substrate by vacuum plasmaspray (VPS). Mechanical properties of VPSed CoNiCrAlY coatings are investigated via Taguchimethod and L18(21×37)[removed info]orthogonal arrays to determine the optimal setting and the relationship ofexperimental variables. Seven parameters were considered as follows: (A) arc current; (B) primarygas flow rate; (C) secondary gas flow rate; (D) stand-off distance; (E) working pressure; (F) carriergas flow rate (Ar); and (G) powder feeding rate.[removed info]The effect of carrier gas flow rate on the porosity isdetermined to be the highest among the parameters investigated. Higher microhardness values areobserved for the VPSed coatings as compared to the coatings prepared by conventional highvelocity oxygen fuel probably due to low amount of the porosity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1549.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Sinterbility and Mechanical Properties of Zirconia Nanoparticles Prepared by Hydrothermal Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1293-1296 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A hydrothermal method has been used to produce nanoparticles of 3 mol% yttria-stabilizedtetragonal zirconia (3Y-TZP) with high fracture toughness. The effects of reaction temperature andpH on crystallite size and sintered density, and the influence of Nb2O5 addition into 3Y-TZP ontoughness have been investigated. The particle size increased with increasing the processingparameters and the influence of temperature was more significant than pH. The density of nanosized3Y-TZP increased with increasing pH up to 9 and then decreased abruptly with further increase. Thedensity increased slightly with the reaction temperature up to 140°C and then changed little withincreasing temperature. The toughness increased in proportional to the Nb2O5 content. After sinteringfor 1 h at 1270°C, the highest relative density of 98% was obtained from nanoparticles of about 17nm, prepared at 200°C and pH 9, and the toughness of 3Y-TZP was increased from 2.5 to 8.3MPam1/2 by addition of 1.2 mol% Nb2O5
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1293.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Highly Sinterable Lithium Titanate Powders Fabricated by an Organic-Inorganic Solution Route (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 807-810 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Highly sinterable lithium titanate (Li2TiO3) powder was fabricated by an organic-inorganicsolution route. Liquid-type ethylene glycol (EG) was used as an organic carrier for the metal cations.Titanium isopropoxide and lithium nitrate were dissolved in the liquid-type ethylene glycol withoutany precipitation. The dried precursor gel showed crystalline form at 300 °C and carbon-free Li2TiO3was observed above 400 °C. The primary particle size of the carbon-free Li2TiO3 was about 100 nm,and the structure of the crystallized powder was porous and agglomerated. The porous powder wasball-milled and easily ground to fine particles. The powder compact was densified to 93% theoreticaldensity (TD) at relatively low sintering temperature of 1100 °C for 2 h. The densifed Li2TiO3 showeda small grain size of 1.2 μm. As well, the grain size was notably increased at 1200 °C and above. Afterthe over grain growth, further densification was no more observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.807.pdf
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