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  • Articles  (7)
  • Other Sources
  • Articles: DFG German National Licenses  (7)
  • Springer  (7)
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  • Physics  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Ta2O5 thin-films deposited by off-axis and on-axis pulsed laser deposition techniques (1999)
    Springer
    Applied physics 69 (1999), S. S609 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.F; 77.55; 77.84.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The crystalline properties of Ta2O5 thin films deposited by an off-axis aperture-installation-type pulsed laser deposition technique are investigated and the results are compared with the results for films deposited by the conventional on-axis technique. No significant difference in the substrate temperature dependence is seen between films deposited on-axis or off-axis at a pulse repetition frequency of 30 Hz. When the repetition frequency is lowered, the degree of c-axis orientation is increased in both films. This tendency is more pronounced in the off-axis films. Therefore it is found that the off-axis aperture-installation-type pulsed laser deposition technique is effective not only for decreasing the density of droplets, but also for obtaining more highly c-axis-oriented crystalline films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051487
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrasonic relaxation in Na2Zr1.5Mg0.5 (PO4)3-Al2O3 composite (1995)
    Springer
    Ionics 1 (1995), S. 92-95 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the ultrasonic attenuation dependent on Al2O3 concentration at 3 MHz as a function of temperature in Na2Zr1.5Mg0.5(PO4)3-Al2O3 composite. From the ultrasonic relaxation spectra, we obtained an activation energy and a relaxation strength and then compared to the data obtained from an analysis of frequency-dependent resistivity. The background attenuation at 430 K was also estimated. Owing to these results, we explained an ionic mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02426014
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  • 3
    Electronic Resource
    Electronic Resource
    Mixed ion effects in Na/Cu-NaZr2(PO4)3 (1998)
    Springer
    Ionics 4 (1998), S. 114-117 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mixed ion effect by which the conductivity minimum of a crystal with three dimensional diffusion path is observed is firstly reported for Na/Cu-NaZr2(PO4)3. The phase diagram is also obtained by estimating the frequency dependence of ionic conductivity. The behavior is in agreement with the conductivity result. NMR spectra (23Na MAS) showed the formation of an ordered distribution among different kinds of ions. The ionic conductivity of the mixed ion system Na/Cu was calculated for a two dimensional honeycomb lattice by means of the path probability method (PPM). It suggested that the mixture of two ions led to the conductivity minimum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375788
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  • 4
    Electronic Resource
    Electronic Resource
    Mixed alkali effect in a three dimensional structure NASICON (2000)
    Springer
    Ionics 6 (2000), S. 107-111 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The conductivity has a minimum against ionic ratio in Na2−yAgyZr1.5Mg0.5(PO4)3 with a three dimensional network which is called as a mixed alkali effect (MAE). In this paper, we discussed23Na and31P MAS NMR spectra in MAE. The central line profiles exhibit characteristic changes due to values of asymmetry parameter η. The observed profiles are produced by the second-order quadrupole interaction with the electric field gradient. The peak intensity of side band against ionic ratio in MAS NMR spectra showed a small maximum due to the Na-Ag dipolar interaction which corresponds to the conductivity minimum. The chemical shifts of31P MAS NMR showed the strong dependence of polarizability of mobile ions that share oxygens in the PO4 tetrahedra and the ZrO6 octahedra. Their results indicate that there are some ordered structures of Na-Ag dependent on the ionic ratio in MAE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375553
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  • 5
    Electronic Resource
    Electronic Resource
    Anomalous temperature dependence of conductivity and X-ray diffraction in CuxPb1−xBr2−x solid solution (1996)
    Springer
    Ionics 2 (1996), S. 289-292 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the electrical impedance of CuxPb1−xBr2−x was measured. Both conductivity and relaxation time of ion migration at two temperature regions above and below 145 °C showed anomalous differences. Intensity measurements of X-ray diffraction were also carried out varying the temperature over the range from 30 to 200 °C. The integrated intensity for Bragg reflection abruptly decreased above 145 °C with increasing temperature. We obtained a mean square displacement of atoms, resulting from a Debye-Waller factor. It is therefore concluded that the anomalous temperature dependence of the conductivity above 145 °C is due to anharmonic vibration of the Cu atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02376036
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  • 6
    Electronic Resource
    Electronic Resource
    Mixed ion effects in Na/Ag-NaZr2(PO4)3 (1999)
    Springer
    Ionics 5 (1999), S. 140-143 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ionic conductivity against the ionic ratio showed a shallow minimum in Na/Ag-NaZr2(PO4)3 with a three-dimensional diffusion path. The ionic conductivity of the mixed ion system Na/Ag was calculated by means of the path probability method (PPM) using a two-dimensional honeycomb lattice model, resulting from the weak interaction between two different ions.23Na MAS NMR spectra showed the second-order quadrupole interaction with the electric field gradient. It is concluded that the mixture of two ions in NaZr2(PO4)3 with a three-dimensional diffusion path led to the conductivity minimum due to the ordered distribution of Ag and Na ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375917
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  • 7
    Electronic Resource
    Electronic Resource
    Phase transition and copper ion conductor in PbBr2-CuBr (1997)
    Springer
    Ionics 3 (1997), S. 139-142 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The solid solution of PbBr2-CuBr has a high electric conductivity above 150 °C. The frequency and temperature dependences of complex dielectric constants have been investigated in the concentration of x=0.01-0.3. They exhibited a strong dieletric relaxation caused by the ionic conduction. Specific heat capacities have been measured in the temperature range from 100 to 200 °C. They showed no anomalous specific heat at the temperature 150 °C, but a distinct peak of heat was found at about 170 °C depending on the concentration. Using the simplified model of disorder of mobile ions, the excess specific heat was explained as the transition of copper ions between two sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375537
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