ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Shrinkage Behavior of Knoop Indentations in Silica and Soda–Lime–Silica Glasses (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: The annealing characteristics of Knoop-indented silica and soda–lime–silica glasses were investigated. These glasses were indented using a Knoop indenter in water, and they were annealed at various temperatures below the glass transition temperature. The major diagonal length of the Knoop indentation was measured before and after annealing, and the change of the diagonal length was determined. The change of diagonal length in silica glass was much larger than that in soda–lime–silica glass. This was attributed to the occurrence of more densification around the Knoop indentation in the silica glass. The activation energy of the shrinkage of the Knoop indentation in the silica glass, estimated from the temperature dependence of the relaxation time, was 46 kJ/mol, which was much less than that of viscous flow in silica glass. This suggested that the shrinkage of the Knoop indentation was caused by the structural relaxation of densified glass around the Knoop indentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00976.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Induction and relaxation of optical second-order nonlinearity in tellurite glasses (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2046-2051 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Second harmonic generation has been examined for 30ZnO⋅70TeO2 glass with a two-step poling procedure in order to understand the poling temperature dependence of second harmonic intensity. When the poling temperature increases, the second harmonic intensity increases, manifests a maximum at the temperature which we call an optimum poling temperature, and decreases drastically just below the glass transition temperature. The glass treated with two-step poling, which includes poling at 300 °C and subsequent poling at the optimum poling temperature, i.e., 280 °C, exhibits much smaller second harmonic intensity and more unambiguous Maker fringe pattern than that poled only at 280 °C. This fact suggests that the decrease in second harmonic intensity with an increase in poling temperature cannot be attributed to a reversible process like a thermal fluctuation of dipoles, but is governed by an irreversible one. Based on a linear relation between the optimum poling temperature and glass transition temperature, the irreversible process is deduced to consist of some oxidation reactions such as a migration of nonbridging oxide ions to and subsequent evaporation of oxygen gas at the anode side. Decay of the second harmonic intensity for 30NaO1/2⋅70TeO2 glass as well as 30ZnO⋅70TeO2 glass has also been examined at room temperature. Whereas the 30ZnO⋅70TeO2 glass does not show a decay, the second harmonic intensity of the 30NaO1/2⋅70TeO2 glass decays rapidly with an average relaxation time of 10 h. This relaxation behavior is explainable in terms of the difference in mobility between Zn2+ and Na+ ions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369500
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Mössbauer spectroscopic study on bonding characteristics of iron in Fe–B and Fe–P amorphous alloys (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 728-731 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An expression for the temperature dependence of recoil-free fraction of iron atoms was derived from the two-band theory proposed previously by the present authors, and it was applied to investigate the bonding characteristics of iron in amorphous Fe83B17, Fe80B20, and Fe80P20 alloys. The characteristic temperatures were found to be θ1=605 K and θ3=230 K for amorphous Fe83B17, θ1=655 K and θ3=185 K for amorphous Fe80B20, and θ1=425 K and θ3=185 K for amorphous Fe80P20. The comparison between these values with those obtained from the specific-heat measurements showed a good agreement for θ1, which is a measure of interatomic bond strength, indicating that metalloid atoms are not connected to each other in these Fe–mettalloid binary amorphous alloys but are bonded to iron atoms. Based on this result, the force constant was estimated for Fe–B, Fe–P, and Fe–Fe bonds. On the other hand, the values of θ3 obtained from the Mössbauer study were significantly different from those obtained from specific-heat measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337421
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Fluorescence line narrowing spectroscopy of Sm2+ and Eu3+ in sodium borate glasses (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 924-930 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A fluorescence line narrowing technique was carried out for sodium borate glasses containing a Sm2+ ion and its isoelectonic Eu3+ ion under a pulsed tunable dye laser excitation. In order to obtain site-dependent information, measurements were made by exciting the inhomogeneously broadened 5D0-7F0 transition at 10 K. Line-narrowing fluorescence of the 5D0→7F1 transition and the temporal changes of the emission lines were investigated as a function of excitation energy, and the dynamics of excited states for both ions were compared with each other. The results indicate that the site-to-site variations of the inhomogeneous broadening of 5D0–7F0 transitions are attributed to the apparent difference in local environment between the Sm2+ and Eu3+ ions doped in borate glasses with Na2O content from 10 to 20 mol %. Also, a decrease in concentration of rare-earth ions causes a more significant effect on Eu3+ ions than on Sm2+ ions in the high-excitation-energy range. It is concluded that the difference in the local environment between Sm2+ and Eu3+ is mainly ascribable to the difference in the valence and in the ionic radius. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364223
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...