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  • 1985-1989  (10)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Low field investigation of the gold donor level in silicon by noise and resistance measurements (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 201-204 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The generation-recombination noise spectral density and the resistance of an overcompensated gold-doped silicon p+-p−-p+ resistor with boron dopant concentration Na=1.0×1015 cm−3 are measured as a function of temperature in the low field regime. The temperature dependence of the plateau values of the noise spectra and the resistance are used to extract the trap energy, the hole capture cross section, and the spin degeneracy factor. The values so obtained are in good agreement with published data in the literature, indicating that this method is an accurate technique to investigate deep-level properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342571
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamic theory of PbZrO3 (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3173-3180 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A thermodynamic theory is presented to model the phase transitions and properties of lead zirconate. The free energy ΔG is expressed as a power series in terms of the ferroelectric polarization (Pi=Pai+Pbi) and antiferroelectric polarization (pi=Pai−Pbi) including all possible terms up to the sixth power, but only first-order cross coupling terms and couplings to elastic stress. Under the assumption that only the lowest-order coefficients of Pi and pi are linearly temperature dependent (Curie–Weiss behavior) and all other constants are temperature independent, experimental data are used to define the constants and permit calculation of ferroelectric and antiferroelectric free energies as a function of temperature. Use of the function to define the averaged dielectric permittivity at room temperature in the antiferroelectric phase gives a value of εR=120 in good agreement with recent microwave measurements. A simplified technique for modifying the function to explore solid solution with lead titanate is examined, and shown to lead to excellent agreement with the known phase diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342668
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High-frequency strain response in ferroelectrics and its measurement using a modified Mach-Zehnder interferometer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2807-2813 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we report on a modified Mach-Zehnder interferometer which is capable of measuring the ultrashort time strain response of a sample. Using this instrument, the dispersion of piezoelectric and electrostrictive coefficients of several commonly used ferroelectrics was measured. The strain switching behavior of lead lanthanum zirconate titanate (PLZT) 9/65/35 driven by a square pulse electric field was studied. The results show that the switching rise time of the strain response for PLZT 9/65/35 can be much shorter than 5 μs at a pulse field strength near 25 kV/cm and that the fall time of the strain response is considerably shorter than the rise time in the experimental field strength range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342744
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Domain wall excitations and their contributions to the weak-signal response of doped lead zirconate titanate ceramics (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6445-6451 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ac field dependence of the polarization and strain responses of three different compositions of doped lead zirconate titanate ceramics were measured for samples in both the poled and the depoled states. The results indicate that a reversible domain wall excitation exists which contributes to the weak-signal response of these materials. Irreversible domain wall motion can be excited within the frequency range measured by applying a field above a threshold field, which is much smaller than the coercive field. Therefore, the weak-signal linear dielectric, piezoelectric, and elastic coefficients of these materials may not provide a suitable description of their behavior when the external applied field exceeds this threshold field. All the observed phenomena can be explained by thermally activated domain wall fluctuations and nucleations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342059
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Si-doped GaAs diodes with negative resistance (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1775-1780 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical and optical properties of amphoteric Si-doped GaAs diodes prepared by a single-step liquid-phase-epitaxy technique have been studied. These diodes have a P-P0-N structure and their current-voltage characteristics exhibit a negative resistance near 77 K. Existence of a recombination barrier is confirmed near the P0-P boundary by the spatial distribution of light emission, and a typical onset voltage of the negative resistance is 3 V at a current of 30 mA at 77 K. This low value can be interpreted as due to the relatively high density of thermally generated holes contributed by the shallow acceptors with activation energy of ∼30 meV. The deep acceptor level of ∼100 meV above the valence band edge is considered to be the origin for the negative resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339918
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Thermodynamic theory of PbTiO3 (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3331-3338 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A phenomenological thermodynamic theory of PbTiO3 was developed using a modified Devonshire form of the elastic Gibbs free energy. The spontaneous strain as a function of temperature was determined from pure sol-gel derived PbTiO3 powder and used with selected data from the literature to determine the coefficients of the energy function. The theoretical prediction of the phase stability, spontaneous polarization and strains, and dielectric and piezoelectric properties agree well with experimental data. This theory provides a way of predicting the intrinsic single domain dielectric and piezoelectric properties of PbTiO3, which have not been completely determined from experimental measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339293
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Dielectric measurements on substrate materials at microwave frequencies using a cavity perturbation technique (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2466-2468 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A cavity perturbation resonance technique suitable for microwave measurements on substrate materials is discussed. The technique makes use of thin rectangular samples placed in a rectangular waveguide cavity (Q∼5000). The availability of advanced microwave measurement equipment makes it possible to record experimental data at several frequencies (five in this present case). The estimated accuracy of measurements is ±2% for dielectric constant and 3×10−4 for dielectric loss. Results are reported in the 8.2–12.4-GHz frequency range for alumina and specially prepared silica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341024
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Nonlinear bending analysis of orthotropic rectangular plates by the method of differential quadrature (1989)
    Springer
    Computational mechanics 5 (1989), S. 217-226 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The behavior of thin, rectangular, orthotropic elastic plates, with immovable edges and undergoing large deflections, is investigated by the numerical technique of differential quadrature. Approximate results are obtained, using the Newton-Raphson method and, alternatively, a finite-difference-based method to solve the nonlinear systems of equations. Bending stresses, membrane stresses, and deflections are calculated for plates with fully clamped and simply supported flexural edge conditions under uniform pressure loading. Results are compared with existing analytical, numerical, and experimental ones. The present method gives good accuracy and is computationally efficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046487
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical models for creep slip of nailed joints between wood and wood-based materials (1989)
    Springer
    Wood science and technology 23 (1989), S. 237-249 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Applying modern methods of analyzing floor, wall, and connection subsystems in light-frame wood buildings requires information on the stiffness of nailed joints under long-term loads. Because this information can best be derived by testing nail-joint specimens under constant loads, theoretical procedures were developed that use test data for constant loads to predict stiffness under variable in-service loads; five nonlinear, viscous-viscoelastic models were develpoed on the basis of existing formulations of creep and mechanisms of load transfer between nails and wood. The models incorporated the modified superposition and strain-hardening principles in describing responses to discrete or continuous loading functions. Tests have shown that the models closely predict creep slip of typical nailed joints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367737
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    FTIR and Raman spectral study of the preparation of lead zirconate (PbZrO3) by a solgel process in a non-flowing air atmosphere (1989)
    Springer
    Journal of materials science 24 (1989), S. 3873-3877 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Lead zirconate (PZ) materials were prepared by a sol-gel process in a non-flowing air atmosphere with no continuous agitation using lead acetate and zirconium propoxide in methoxyethanol as the precursor materials. Fourier transform infrared and Raman spectroscopy were used to characterize the structural changes that occurred during various stages of this preparation. Crystalline phase formation differences were noted during this sol-gel preparation for PZ in comparison to those occurring during the related preparation for lead titanate (PT). Metallic lead and lead oxide (PbO) were formed during the heating steps of this process in an air atmosphere for PZ.In situ Raman spectra were also measured at higher temperatures for the resulting sol-gel prepared PbZrO3 material in order to investigate its phase-transition and soft-mode behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168949
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    Paper (German National Licenses)
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