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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 pioneering study of the electron transport in nanometer-thick Ir film supported by a DNA fiber, and the phonon transport sustained by the DNA itself is reported.
43 citations
TL;DR: In this paper, the effects of Li concentration on the Mg-Li binary system were investigated, and five ground state structures were found at Li 1 Mg13, Li 2 Mg2, Li 3 Mg1, Li 7 Mg 2 and Li 15 Mg 1 compositions, and the effect of the phonon band gap on lattice thermal conductivity was investigated.
43 citations
TL;DR: An ultrasonic pulse-echo technique was employed, at 5MHz, for measuring: the ultrasonic attenuation, longitudinal and shear wave velocities, elastic moduli, Poisson ratio, Debye temperature and hardness of the present glasses as discussed by the authors.
Abstract: Specimens of the glassy system: (70 − x)TeO2 + 15B2O3 + 15P2O5 + xLi2O, where x = 5, 10, 15, 20, 25 and 30 mol% were prepared by the melt-quenching. An ultrasonic pulse-echo technique was employed, at 5 MHz, for measuring: the ultrasonic attenuation, longitudinal and shear wave velocities, elastic moduli, Poisson ratio, Debye temperature and hardness of the present glasses. It is found that the gradual replacement of TeO2 by Li2O in the glass matrix up to 30 mol% leads to decrease the average crosslink density and rigidity of prepared samples which affects the properties, i.e., the hardness, ultrasonic wave velocities and elastic moduli are decreased, while the Poisson ratio and the ultrasonic attenuation are increased. Also, optical absorption spectra were recorded in the range, 200–800 nm for these glasses. The obtained results showed that a gradual shift in the fundamental absorption edge toward longer wavelengths occurred. Values of both of the optical energy gap, Eopt, and width tails, ΔE, are determined. It is observed that Eopt is decreased and ΔE increased with the increase of Li2O in the glass matrix up to 30 mol%. The compositional dependences of the above properties are discussed and correlated to the structure of tested glasses.
43 citations
TL;DR: In this article, it was shown that there is a linearity between the thermal pressure P TH and T between the Debye temperature θ and some high temperature T ∗.
43 citations
TL;DR: In this article, the elastic constants of polycrystalline copper were determined between 4 and 295 K by measuring ultrasonic velocities, longitudinal and transverse, and the Hershey-Kroner-Eshelby theory agreed best with observation.
Abstract: Elastic constants of polycrystalline copper are determined between 4 and 295 K by measuring ultrasonic velocities, longitudinal and transverse. Five elastic constants are given: longitudinal modulus, shear modulus, Young's modulus, bulk modulus (reciprocal compressibility), and Poisson's ratio. Considering eight theories of single-crystal :polycrystal elastic constants, the Hershey-Kroner-Eshelby theory agrees best with observation, within 1% for the shear modulus, G. (Voigt and Reuss first-order bounds on (G differ by 29%.) A problem exists concerning the calculation of the Debye temperature of polycrystalline aggregates.
43 citations