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  • 1
    Electronic Resource
    Electronic Resource
    Effect of B-site cation stoichiometry on electrical fatigue of RuO2//Pb(ZrxTi1−x)O3//RuO2 capacitors (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1013-1016 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There have been numerous reports that Pb(ZrxTi1−x)O3 (PZT) thin-film capacitors with RuO2 electrodes and compositions near the morphotropic phase boundary exhibit minimal decrease in switched polarization with electric-field cycling. We show that the fatigue performance of RuO2//PZT//RuO2 capacitors strongly depends on PZT film composition. Specifically, we demonstrate that the rate of polarization fatigue increases with increasing Ti content for PZT thin films of tetragonal crystal symmetry deposited on RuO2 electrodes. As the Ti content of the PZT films increased, the film gain morphology changed from columnar to granular and the volume percent of a fluorite-type second phase decreased. These microstructural trends and the possibility that the electrode material acts as a sink for oxygen vacancies are discussed to explain the fatigue dependence on B-site cation ratio for PZT films with RuO2 electrodes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360888
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  • 2
    Electronic Resource
    Electronic Resource
    Highly reflective, long wavelength AlAsSb/GaAsSb distributed Bragg reflector grown by molecular beam epitaxy on InP substrates (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 329-331 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface normal optoelectronic devices operating at long wavelengths ((approximately-greater-than)1.3 μm), require distributed Bragg reflectors (DBRs) with a practical number (≤50) of mirror layers. This requirement implies a large refractive index difference between the mirror layers, which is difficult to achieve in the traditionally used phosphide compounds. We demonstrate a highly reflective AlAsSb/GaAsSb DBR grown nominally lattice matched to an InP substrate by molecular beam epitaxy. Reflectivity measurements indicate a stop band centered at 1.74 μm with maximum reflectivity exceeding 98%, which is well fitted by our theoretical predictions. Atomic force microscopy and transmission electron microscopy indicate reasonable crystal quality with some defects due to an unintentional lattice mismatch to the substrate. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114202
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  • 3
    Electronic Resource
    Electronic Resource
    Amorphous structure of metamict minerals observed by TEM (1981)
    [s.l.] : Nature Publishing Group
    Nature 293 (1981), S. 449-450 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Most previous studies of metamict minerals have been restricted to detailed X-ray diffraction analyses or measurements of changes in physical and optical properties with increasing a dose16"17. None of these techniques allows the structure of the metamict state to be interpreted at the near-atomic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/293449a0
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  • 4
    Electronic Resource
    Electronic Resource
    Polymer approach to supported silica membranes (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 469-476 
    Details
    ISSN: 1573-4846
    Keywords: silica membranes ; pore size ; aggregation ; templates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Polymeric silica sols were used to prepare membranes on commercial γ-Al2O3 supports with nominal support pore diameters of 4.0 nm. Aging of the silica sols was shown to be effective to form discrete membrane layers. He/N2 selectivity factors exceeding ideal Knudsen values were observed when the sols were prepared under conditions in which the condensation rate was minimized. We propose that the average pore size of the membrane depends on the balance of capillary pressure and modulus during membrane deposition. The condensation rate might influence the breadth of the pore size distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486293
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