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Debye model
About: Debye model is a research topic. Over the lifetime, 7462 publications have been published within this topic receiving 133987 citations.
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TL;DR: In this paper, a wide range glass system based on the TeO2-WO3-ZnF2 was prepared and a number of physical properties, namely, the glass transition temperature, optical energy gap, Urbach energy, optical basicity, ultrasonic velocity (longitudinal and shear), elastic moduli, Poisson's ratio and Debye temperature were investigated by using several techniques such as: differential thermal analysis, dilatometric, UV-NIR-IR spectra and pulse-echo.
Abstract: A wide range glass system based on the TeO2–WO3–ZnF2 was prepared. A number of physical properties, namely, the glass transition temperature, optical energy gap, Urbach energy, optical basicity, ultrasonic velocity (longitudinal and shear), elastic moduli, Poisson's ratio and Debye temperature were investigated by using several techniques such as: differential thermal analysis, dilatometric, UV–NIR–IR spectra and pulse-echo. These glasses have a high transmission in the visible, the near infrared and infrared regions, very low OH-vibration absorption bands and high thermal stability beyond 169 °C. The results indicated that most properties are observed to be dependent on the ZnF2 content. These physical properties are reported with a view to drawing fluorotellurite optical fibres.
46 citations
TL;DR: The elastic properties of polycrystalline monoclinic Gd2O3 were determined by the sonic-resonance method as mentioned in this paper, where the porosity varied from 0.025 to 0.367 and temperature from room temperature to 1400°C.
Abstract: The elastic properties of polycrystalline monoclinic Gd2O3 were determined by the sonic-resonance method. Volume-fraction porosity varied from 0.025 to 0.367 and temperature from room temperature to 1400°C. The Young's and shear moduli are linear functions of volume-fraction porosity, but the rate of their decrease with increasing porosity is less than that expected. The moduli decreased more rapidly than expected with increasing temperature. The Debye temperature is 362°K. With increasing temperature, the first Grueneisen constant, γ, decreases, whereas the second Grueneisen constant, δ, increases.
46 citations
TL;DR: In this article, the temperature dependence of the dielectric constant (within the range of 173 K to 373 K) for the most widely used acrylic dielectrics elastomer (VHB-4910) was investigated experimentally with the broadband Dielectric spectrometer (BDS).
Abstract: The dielectric constant is an essential electrical parameter to the achievable voltage-induced deformation of the dielectric elastomer. This paper primarily focuses on the temperature dependence of the dielectric constant (within the range of 173 K to 373 K) for the most widely used acrylic dielectric elastomer (VHB 4910). First the dielectric constant was investigated experimentally with the broadband dielectric spectrometer (BDS). Results showed that the dielectric constant first increased with temperature up to a peak value and then dropped to a relative small value. Then by analyzing the fitted curves, the Cole–Cole dispersion equation was found better to characterize the rising process before the peak values than the Debye dispersion equation, while the decrease process afterward can be well described by the simple Debye model. Finally, a mathematical model of dielectric constant of VHB 4910 was obtained from the fitted results which can be used to further probe the electromechanical stability of the dielectric elastomers.
46 citations
TL;DR: In this article, the authors extract phonon contributions from the transport properties of a single crystal and find a phonon drag peak around 70 K, which gives a consistent estimation of the resistivity result.
Abstract: We extract phonon contributions from the transport properties of a ${\mathrm{MgB}}_{2}$ single crystal. The temperature dependence of the in-plane resistivity is well explained by the Bloch-Gr\"uneisen formula with the Debye temperature ${\ensuremath{\Theta}}_{D}\ensuremath{\sim}400 \mathrm{K},$ taking into account an additional contribution of the ${E}_{2g}$ phonon mode $(\ensuremath{\sim}890 \mathrm{K}).$ In the thermoelectric power, we find a phonon drag peak around 70 K, which gives a consistent estimation of ${\ensuremath{\Theta}}_{D}$ with the resistivity result. The pressure dependence of the in-plane resistivity reveals a major contribution of the ${E}_{2g}$ phonon mode to superconductivity.
46 citations
TL;DR: In this paper, a series of as-synthesized Co 1−x Sr x Fe 2 O 4 nano-ferrites, 0.0 − 0.6, were prepared by the chemical co-precipitation method.
46 citations