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  • 1
    Electronic Resource
    Electronic Resource
    The fast cooling/heating rate effects in devitrification of glasses. I. Number of nucleated particles (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 1094-1102 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We consider nucleation of crystalline phase in a glass-forming melt which is quenched at some arbitrary rate, S, and then reheated at some other (typically smaller) rate, H. In conventional (steady-state) approaches it is assumed that the nucleation rate is a function of temperature only, so that the number of nucleated crystallites is proportional to 1/S+1/H. We demonstrate, however, that in general the nucleation rate depends on the quench/heating rate and that there exists an S- and H-dependent temperature region which effectively does not contribute to nucleation, so that the aforementioned scaling does not hold. An expression for the non-steady-state nucleation rate is derived analytically. In certain cases, the number of nucleated crystallites can be reduced by orders of magnitude compared to the steady-state predictions. The results are tested against numerically exact data obtained from the Turnbull–Fisher nucleation model. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475471
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  • 2
    Electronic Resource
    Electronic Resource
    The fast cooling/heating rate effects in devitrification of glasses. II. Crystallization kinetics (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 186-195 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An analytical description of devitrification kinetics induced by time-dependent nucleation and growth of crystallites during a quench-heating cycle is proposed. Relevant experimental situations include differential thermal analysis (DTA) or differential scanning calorimetry (DSC). The proposed description involves very few assumptions regarding the temperature dependence of various kinetic parameters, but rather employs measured values of growth rates. It is shown that the conventional description of nucleation based on the steady-state approximation, as a rule, is inapplicable for the description of the DTA/DSC experiment for experimentally reasonable quench/heating rates. The latter is confirmed by the analysis of available experimental data on o-terphenyl and lithium disilicate. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476548
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  • 3
    Electronic Resource
    Electronic Resource
    Viscous flow in simple organic liquids (1972)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 76 (1972), S. 2317-2325 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100660a023
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  • 4
    Electronic Resource
    Electronic Resource
    Superconducting and structural properties of sputtered thin films of YBa2Cu3O7−x (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 2164-2166 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated thin films of YBa2Cu3Ox by dc triode sputtering from two metallic targets. Post-annealing in pure O2 after sputtering resulted in superconducting films with a Tc onset as high as 89 K and a midpoint Tc of 75 K. We report preliminary results of films deposited on sapphire, MgO and sol-gel coatings of ZrO2 on sapphire, with and without buffer layers of Ag. The chemical and physical structures of these films were analyzed by using several x-ray diffraction techniques and Rutherford backscattering spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98929
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  • 5
    Electronic Resource
    Electronic Resource
    THE ENERGETICS OF NUCLEATION (1965)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 57 (1965), S. 19-31 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50669a006
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  • 6
    Electronic Resource
    Electronic Resource
    Small-angle X-ray scattering study of glassy GeO2 (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 216-221 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A small-angle X-ray scattering study of glassy GeO2 is reported. Data were obtained from 4π sin&thgr;/λ = 0.05 to 2.0 using a Kratky camera. The SAXS intensity decreased monotonically with decreasing angle from the main diffraction peak, and was not noticeably changed by hydrofluoric acid surface treatment or various annealing treatments. The intensity scattered at the smallest angle was 49±2.5 e.u. molec−1. Extrapolated to zero angle, the intensity corresponds to root-mean-square density fluctuations of 10−12 V−1/2 cm−3/2, a value close to that expected from the thermodynamic fluctuation theory of liquids. A parallel study of fused silica has indicated mean-square density fluctuations similar to those found in GeO2. The results are taken as evidence contrary to representations of structure based on specific arrays differing significantly from the interconnecting material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889872009227
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of post-metallization annealing on the ferroelectric properties of sol-gel derived PZT thin films (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 623-626 
    Details
    ISSN: 1573-4846
    Keywords: thin films ; lead zirconate ; lead titanate ; ferroelectric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of monolithic Pt-PZT-Pt capacitors was prepared based on sol-gel derived PZT 53/47 films fired to 700 C. After deposition of top Pt electrodes, the capacitors were subjected to post-metallization annealing (PMA) temperatures of 100 C to 700 C. Dielectric and ferroelectric (FE) characterizations were performed. Increasing the PMA temperature produced lower values of spontaneous and remanent polarizations, dielectric constant and leakage currents. The observations are correlated with a proposed FE capacitor model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486322
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  • 8
    Electronic Resource
    Electronic Resource
    The future of sol-gel science and technology (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 1083-1091 
    Details
    ISSN: 1573-4846
    Keywords: coatings ; powders ; films ; applications ; optical
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper addresses the future prospects for sol-gel processing. It includes responses from nearly two dozen leading practitioners of the sol-gel art, who were kind enough to answer a questionnaire about the present state and future directions of the field. Overall, the prospects appear quite bright; but achievement of anything like the full potential of the method will require greatly increased interaction between sol-gel specialists and device technologists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436988
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  • 9
    Electronic Resource
    Electronic Resource
    Ceramic films for optical applications (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 335-340 
    Details
    ISSN: 1573-4846
    Keywords: films ; optical applications ; waveguides ; electrooptics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Recent progress is reviewed on the wet chemical synthesis of films for optical applications. Specific attention is directed to planar waveguides and to electrooptic, non-linear optical and electrochromic films, including recent results obtained in our laboratories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486266
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  • 10
    Electronic Resource
    Electronic Resource
    Processing and photostability of pyrromethene 567 polycerams (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 953-958 
    Details
    ISSN: 1573-4846
    Keywords: laser dyes ; pyrromethene-BF2 complexes ; photostability ; Polyceram ; solid-state laser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Polyceram materials are attractive hosts for laser dyes because they can have high optical transparencies, high laser damage thresholds, and the ability to tailor optical properties by varying the composition and synthetic routes. Pyrromethene 567 has been successfully incorporated within silica: polydimethylsiloxane (PDMS) Polycerams to obtain polishable, crack-free, transparent monoliths using the sol-gel process. Fluorescence photostability was measured by pumping with aQ-switched, frequency doubled Nd: YAG laser (532 nm) at a pulse rate of 10 Hz. Fluorescence intensity dropped to 50% after approximately 50,000 pulses at a fluence of 0.10 J/cm2. UV degradation studies were performed on Polycerams with different polymer contents, and the absorption photostability is related to the solubility and type of caging of the dye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436967
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