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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 article, the lattice parameters of α-Al2O3 have been measured in a temperature range from 4.5 to 250 K with a relative accuracy of better than 6 × 10−6.
Abstract: The lattice parameters of α-Al2O3 have been measured in a temperature range from 4.5 to 250 K with a relative accuracy of better than 6 × 10−6. The experimental method uses Bragg backscattering and the recently proposed Mossbauer wavelength standard, i.e. the wavelength λM = 86.025474 (16) pm of the nuclear resonance radiation of 57Fe (Shvyd'ko et al., 2000), which has previously been applied successfully to measure the lattice parameters of α-Al2O3 at temperatures between 286 and 374 K (Shvyd'ko et al., 2002). The experimental data in the range from 4.5 to 374 K are consistent with the Debye model of thermal expansion. At 4.5 K, the thermal expansion coefficient is as low as 1.2 (9) × 10−10 K−1 in the a direction.
56 citations
TL;DR: In this paper, the complex permittivity of a SiC fiber-reinforced SiC matrix (SiCf/SiC) composite was measured in a temperature range of 25-700°C at frequencies from 82 to 18 GHz.
56 citations
TL;DR: In this paper, the structural, electronic, elastic and thermodynamic properties of cubic NaTaO3 and KTaOO3 by Density Functional Theory method (DFT) using the full potential linearized augmented plane wave with local orbital (FP-LAPW)+lo.
56 citations
TL;DR: In this paper, the authors derived the elastic properties of the alloys Ti3AlC and T i3AlN from the first-principles total energy calculations based on the full-potential linear muffin-tin Orbital (FP-LMTO) method.
Abstract: Elastic properties of the alloys Ti3AlC and T i3AlN are derived from the first-principles total energy calculations based on the full-potential linear muffin-tin Orbital (FP-LMTO) method. From the computed elastic constants, theoretical values of Young's modulus, shear modulus, Poisson's ratio, sound velocities and Debye temperature are evaluated. By analysing the ratio between the bulk and shear moduli, it is found that Ti3AlN is ductile in nature, whose ductility is expected to be greater than that of Ti3Al, whereas T i3AlC is found to be brittle. The site-projected density of states and the charge density plots have been used to analyse the chemical bonding between the Ti6N and T i6C cluster and the surrounding metallic lattice of Al atoms. This further reveals that the strong covalent nature of Ti-C bonds in Ti3AlC, together with the high Young, shear and bulk moduli, make the compound more brittle than Ti3AlN.
56 citations
TL;DR: The single-crystal elastic constants of tetragonal Al2Cu have been measured over the temperature range 4.2-300 K by the pulse-echo-overlap technique as mentioned in this paper.
Abstract: The single‐crystal elastic constants of tetragonal Al2Cu have been measured over the temperature range 4.2–300 K by the pulse‐echo‐overlap technique. The directly measured constants show a normal monotonic decrease in magnitude with increasing temperature but with C44 showing the least change. The anisotropy ratios C33/C11, C12/C13, and C44/C66 show only small percentage changes between 4.2 and 300 K, but 2C44/(C11−C12) changes by nearly a factor of 2. Comparison of data for Zr2Ni with that for Al2Cu indicates some importance of atomic size effects. A Debye temperature of 402 K was evaluated from the elastic constants at 4.2 K.
56 citations