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  • Articles  (162)
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  • 1
    Electronic Resource
    Electronic Resource
    Thermal expansion and structure of leucite-type compounds (1976)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 80 (1976), S. 1612-1616 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100555a019
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of new amorphous oxides with ferromagnetic character in iron oxide-based systems (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7752-7755 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New amorphous oxides with ferromagnetic character have been found in the Sr-Fe-O and Bi-Fe-O systems. The compositions were 35SrO⋅65Fe2O3 (mol%) and Bi3Fe5O12, and the specimens were prepared by using the twin-roller quenching method. The ferromagnetic character was ascertained by means of magnetization measurements at room temperature. Although the magnetization tended to saturate at relatively low external fields for both systems, hyperfine structure in the Mössbauer spectra was barely observed at room temperature for Bi3Fe5O12 only. It is thought that this phenomenon is due to the superparamagnetic behavior of microcrystal-like clusters which may exist in these amorphous oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347500
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  • 3
    Electronic Resource
    Electronic Resource
    Phase Separation in Sol–Gel Process of Alkoxide-Derived Silica-Zirconia in the Presence of Polyethylene Oxide (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), 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: Phase separation in a sol–gel process of SiO2–ZrO2 in the presence of polyethylene oxide is investigated. An amorphous gel with interconnected macroporous morphology is obtained when phase separation and sol–gel transition concur to fix a transitional structure of spinodal decomposition. Macropore size, together with connectivity of the pores and gel skeleton, can be controlled precisely by selecting an appropriate starting composition for preparation at a zirconium content ≤11.7 mol%. The macroporous gel retains additional mesopores 〈4 nm and exhibits typical bimodal pore size distribution. The addition of ZrO2 in SiO2 improves the thermal stability of both macroporous and mesoporous structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00944.x
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Macroporous Titania Films by a Sol-Gel Dip-Coating Method from the System Containing Poly(ethylene glycol) (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), 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: Macroporous titania (TiO2) films have been prepared via a sol-gel dip-coating method from a titanium tetraisopropoxide solution that contains poly(ethylene glycol) (PEG). The macroporous morphology-i.e., the size, distribution, and shape of the macropores-is controlled by varying the content and molecular weight of PEG, the withdrawal speed, and the temperature of the dipping solution. The morphology of the TiO2 film is determined by competitive contributions of the following factors: (i) decrease in fluidity, because of the evaporation of solvent; (ii) network formation by polycondensation reactions; and (iii) domain formation during phase separation into gel phases and solvent phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02675.x
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and optical properties of transparent glass-ceramics containing β-PbF2:Tm3+ (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3445-3450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transparent glass ceramics containing β-PbF2:Tm3+ crystallites have been prepared by heat treatment of glasses in GeO2-PbO-PbF2-TmF3 system. Average crystallite size of β-PbF2 evaluated from the full width at half maximum of x-ray diffraction lines varies from about 16 to 20 nm as the heat treatment temperature increases from 340 to 400 °C when 50GeO2⋅40PbO⋅10PbF2⋅1TmF3 glass is heat treated. The glass ceramics containing β-PbF2:Tm3+ of 16 nm is transparent in the visible region. The incorporation of Tm3+ into β-PbF2 crystalline phase has been demonstrated from the linewidth and peak position of optical absorption spectrum. Frequency upconversion fluorescence has been observed for the transparent glass ceramics at room temperature. The upconversion fluorescence intensities due to the 1D2→3H6 and 1D2→3F4 transitions are higher for the transparent glass ceramics than for the glass. This phenomenon is explainable by assuming that the multiphonon relaxation rate of the 3H4 state is smaller in the glass ceramics than in the glass. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359975
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  • 6
    Electronic Resource
    Electronic Resource
    Poling temperature dependence of optical second-harmonic intensity of MgO–ZnO–TeO2 glasses (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3798-3800 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Poling temperature variation of optical second-harmonic intensity induced by electrical poling has been examined for 30ZnO⋅70TeO2, 5MgO⋅25ZnO⋅70TeO2, and 10MgO⋅20ZnO⋅70TeO2 glasses. The Maker fringe pattern of these glasses indicates that the orientation of electric dipoles presumably due to TeO4 trigonal bipyramids and TeO3 trigonal pyramids is not restricted within the glass surface but extends into the inside of bulk glass. The poling temperature dependence of second-harmonic intensity manifests a maximum in all the glasses. There exists a tendency that the poling temperature which corresponds to the maximum of second-harmonic intensity is higher in the glass with higher glass transition temperature. This fact suggests that the orientation of tellurite structural units occurs as a result of the structural relaxation of tellurite network at around the glass transition temperature. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361375
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  • 7
    Electronic Resource
    Electronic Resource
    Faraday effect of sodium borate glasses containing divalent europium ions (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 840-844 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Faraday effect measurements have been carried out at room temperature for some sodium borate glasses containing Eu2+ ions prepared under a reducing atmosphere. The wavelength dependence of the Verdet constant is analyzed in terms of a theory derived by Van Vleck and Hebb to obtain effective transition wavelength of the 4f7→4f65d transition which causes the Faraday effect of Eu2+ in the visible range. The effective transition wavelength increases with an increase in the optical basicity of glass. This phenomenon is explained in terms of the crystal field theory; because the splitting of 5d levels is larger in the glass with larger optical basicity, the energy required for the 4f7→4f65d transition decreases as the optical basicity of glass increases. The magnitude of Verdet constant increases with an increase in the effective transition wavelength when the concentration of EuO remains constant. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365782
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  • 8
    Electronic Resource
    Electronic Resource
    Persistent spectral hole burning of Eu3+ ions in sodium aluminosilicate glasses (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5114-5120 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hole burning spectroscopy has been carried out for glasses with compositions of (75−x)SiO2⋅xAlO3/2⋅25NaO1/2⋅1.0EuO3/2 with several aluminum oxide contents. Persistent hole was burned in the 5D0−7F0 transition of Eu3+ at temperatures between 4.2 and 20 K in aluminosilicate glasses, while the hole burning was not observed above 4.2 K in silicate glass. In other words, an introduction of Al3+ ions in silicate glass promotes the formation of a stable hole. Hole spectra without any antiholes suggest that the holes are burned by an optically induced rearrangement of local structure around the Eu3+ ion. The homogeneous linewidth shows a linear dependence with T between 4.2 and 8 K and a nearly quadratic dependence for T〉8 K. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366313
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of poling temperature on optical second harmonic intensity of sodium zinc tellurite glasses (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3986-3990 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Poling temperature dependence of optical second harmonic intensity has been examined for Na2O–ZnO–TeO2 glasses. All the glasses exhibit such a tendency that the second harmonic intensity increases, experiences a maximum, and decreases as the poling temperature increases. The poling temperature giving rise to the maximum second harmonic intensity, which we call an optimum poling temperature, correlates with glass transition temperature; there exists a linear relation between them. This phenomenon indicates that the structural change of glass network near the glass transition temperature affects the orientation of electric dipoles with a long range order which induces the second harmonic generation. We suggest that some electrochemical reactions take place on the anode-side surface of glass at around the glass transition temperature where viscous flow is allowed and disturb the orientation of electric dipoles. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367154
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  • 10
    Electronic Resource
    Electronic Resource
    Second-order Doppler shift in Mössbauer spectra of Fe-B and Fe-P amorphous alloys (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3299-3301 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The change of second-order Doppler shift with temperature in Mössbauer effect measurements was estimated by using the two-band model with two characteristic temperatures, θ1 and θ3, rather than the Debye model. The experimental results for Fe83B17, Fe80B20, and Fe80P20 amorphous alloys were in good agreement with the calculated ones. The isomer shift was also obtained and the bonding characteristics and s-electron density of the iron atoms in these substances were discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341504
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