Atomistic Properties of Solids

Sirdeshmukh, D. B.; Sirdeshmukh, Lalitha; Subhadra, K. G.

doi:10.1007/978-3-642-19971-4

Cited by 25 publications

(25 citation statements)

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“…It is noted that the value of the ideal crystal density ρ is not considerably affected by the presence of a small number of defects (Frenkel defects), so it is almost equal to the bulk density ρm (ρm = ρ), but it is well known that the formation of vacancies in metals or Schottky defects in ionic crystals with big quantity leads to an increase in bulk volume as new atomic layers are formed on the crystal surface. This means that the bulk density (ρm) decreases (ρm < ρ) [17]. On other hand, the existence of pure interstitials results in an increase in bulk density (ρm > ρ) [17].…”

Section: Crystal Density and Sound Velocitiesmentioning

confidence: 98%

“…This means that the bulk density (ρm) decreases (ρm < ρ) [17]. On other hand, the existence of pure interstitials results in an increase in bulk density (ρm > ρ) [17]. So the crystal density ρ can play a very important role on the identification of defects in crystals, and with consequence in solid state physics.…”

Section: Crystal Density and Sound Velocitiesmentioning

confidence: 99%

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Sound velocities and Debye temperature of BeSe under high pressure up to 50 GPa

Daoud

2016

IJPR

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The mechanical behavior, sound velocities and Debye temperature of beryllium-selenide (BeSe) semiconductor under pressure up to 50 GPa have been estimated using the structural parameters and elastic constants of Fanjie Kong and Gang Jiang (Physica B 404 (2009) 3935-3940). The Pugh ratio, the directional dependence of elastic wave velocity, the longitudinal, transverse and average sound velocities, and the Debye temperature are successfully predicted and analyzed in comparison with the available theoretical data. The analysis of the Pugh ratio indicates that this compound is prone to brittle behavior. Our obtained results of the longitudinal, transverse and average sound velocities at high pressure indicate that these of Kong and Jiang (Physica B 404 (2009) 3935-3940) are not correctly predicted.

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Section: Crystal Density and Sound Velocitiesmentioning

confidence: 98%

Section: Crystal Density and Sound Velocitiesmentioning

confidence: 99%

Sound velocities and Debye temperature of BeSe under high pressure up to 50 GPa

Daoud

2016

IJPR

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“…The standard explanation of the distinction between N and U processes [4][5][6][7][8][9][10] is illustrated in Figs. 1(a) and 1(b).…”

Section: Difficulties With "Momentum Conservation"mentioning

confidence: 99%

Demystifying umklapp vs normal scattering in lattice thermal conductivity

Maznev

Wright

2014

American Journal of Physics

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We discuss the textbook presentation of the concept of umklapp vs normal phonon-phonon scattering processes in the context of lattice thermal conductivity. A simplistic picture, in which the “momentum conservation” in a normal process leads to the conservation of the heat flux, is only valid within the single-velocity Debye model of phonon dispersion. Outside this model, the simple “momentum conservation” argument is demonstrably inaccurate and leads to conceptual confusion. Whether or not an individual scattering event changes the direction of the energy flow is determined by the phonon group velocity, which, unlike the quasimomentum, is a uniquely defined quantity independent of the choice of the primitive cell in reciprocal space. Furthermore, the statement that normal processes do not lead to a finite thermal conductivity when umklapp processes are absent is a statistical statement that applies to a phonon distribution rather than to individual scattering events. It is also important to understand that once umklapp processes are present, both normal and umklapp processes contribute to thermal resistance. A nuanced explanation of the subject would help avoid confusion of the student and establish a connection with cutting edge research.

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“…Also, dislocation density plays a significant role on brittle to ductile transition, fatigue, hardness, work hardening, and plastic behavior of metals and alloys [5][6][7][8]. Furthermore, dislocations have considerable effect on physical properties of metals such as density [9][10][11][12], thermal conductivity [13,14], and electrical resistivity [9,13,14].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Dislocation Density in Cold-Rolled Copper Using Electrochemical Impedance Spectroscopy

et al. 2013

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Variation of electrochemical impedance with dislocation density was investigated using electrochemical impedance spectroscopy (EIS). For this purpose, EIS measurements were carried out on 10, 20, 30, 40, and 50% cold-rolled commercially pure copper in 0.1 M NaCl (pH = 2) solution. Nyquist plots illustrated that the electrochemical reactions are controlled by both charge transfer and diffusion process. Increasing dislocation density, the magnitude of electrochemical impedance of samples was decreased. Decreasing magnitude of impedance at intermediate frequencies indicated increasing double-layer capacitance. Charge transfer resistance decreased from value 329.6 Ωcm 2 for annealed sample to 186.3 Ωcm 2 for sample with maximum dislocation density (1.72 × 10 15 m −2 ). Phase angles were lower for samples that contained more dislocation density, indicating more tendencies to loss of electrons and releasing atoms into electrolyte.

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Atomistic Properties of Solids

Cited by 25 publications

References 0 publications

Sound velocities and Debye temperature of BeSe under high pressure up to 50 GPa

Sound velocities and Debye temperature of BeSe under high pressure up to 50 GPa

Demystifying umklapp vs normal scattering in lattice thermal conductivity

An Investigation on Dislocation Density in Cold-Rolled Copper Using Electrochemical Impedance Spectroscopy

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