Thermodynamical properties of ultrathin layered structures

Lazarev, S.B.; Pantić, M.; Stojković, S.M.; Tošić, B. S.; Šetrajčić, Jovan P.

doi:10.1016/s0022-3697(99)00392-3

Cited by 15 publications

(7 citation statements)

References 8 publications

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“…Phonon participation in thermodynamic properties (or heat capacitance temperature behavior, i.e. generallyin heat transferring) in thin film was found in our previous paper (Lazarev et al, 2000;Jaćimovski et al, 2004;Šetrajčić et al, 2007;Ilić et al, 2007;Šetrajčić et al, 2009). Getting that, when k → 0 (in long-wave approximation: 4 sin 2 (ak x /2) + sin 2 ak y /2 ≈ a 2 k 2 , k 2 = k 2 x + k 2 y ), energies of all three phonon branches have non-zero values, it can be utilized dispersion relations 22, 49 and 64, in somewhat simplified form:…”

Section: Phonon Thermodynamics Of Thin Film-structuresmentioning

confidence: 58%

Phonon Participation in Thermodynamics and Superconductive Properties of Thin Ceramic Films

Šetrajčić¹,

Zorić²,

Delić³

et al. 2011

Thermodynamics

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Section: Phonon Thermodynamics Of Thin Film-structuresmentioning

confidence: 58%

Phonon Participation in Thermodynamics and Superconductive Properties of Thin Ceramic Films

Šetrajčić¹,

Zorić²,

Delić³

et al. 2011

Thermodynamics

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“…The standard Hamiltonian of phonon subsystem [20][21][22][23] in the nearest neighbors approximation can be written as follows:…”

Section: Micro-theory Of Phonons In Layered Structuresmentioning

confidence: 99%

Phonon contribution to heat capacitance of nanolayered crystalline structures

Šetrajčić

Jaćimovski²,

Sajfert

2015

Mod. Phys. Lett. B

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The paper presents the innovated method of two-time dependent Green's functions applied to the bounded and translational perturbed systems. Film-structures and superlattices were analyzed by employing the phonon spectra for the calculation of relevant thermodynamic characteristics. Free energy and the internal energy of the system were found as well as the temperature behavior of layered structures. Heat capacitances of these nanostructures were compared to bulk ones. It was shown that heat capacitances of nanolayered structures in low-temperature region were higher than the same quantities of the corresponding bulk sample. In the middle and the highest temperature region, temperature behavior was inverse: heat capacitance of layered structures was lower than of the corresponding bulk ones. The consequences were discussed with relation to the (super)conductive properties of nanomaterials.

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“…Depending on what material is used as a coating, thermal conductivity can be altered. 15 Unlike in the previous papers, 16 here we will try to observe the difference between the characteristics of different nano-crystalline structures: ultrathin films, composite films, i.e. superlattices, nanorods and quantum dots, we were interested in whether the quantum size effects (quantum confinement), quantum (de)coherence and influence of boundary conditions, strengthen or weaken in nanosamples.…”

Section: Theoretical Modellingmentioning

confidence: 99%

Review of results of theoretical approaches to phonon engineering of thermodynamic properties for different quantum structures

Jaćimovski¹,

Šetrajčić²

2015

NBP

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Summary: Application of nano-structures requires a knowledge of their fundamental physical (mechanical, electro-magnetic, optical, etc.) characteristics. Thermodynamic properties associated with phonon displacements through the nanosamples are particularly interesting. Independent of the type of lattices, the thermodynamics of their subsystems (electrons, excitons, spin waves, etc.) is determined when the subsystem is in thermodynamic equilibrium with phonons. Phonons are collective mechanical oscillations of molecules or atoms and represent the most important system of excitations. Besides, the acoustical characteristics as well as conductive and superconductive properties etc. could not be realistically explained without phonons. In this paper we will try to observe the difference between the characteristics of different nano-crystalline structures: ultrathin films, composite films, i.e. superlattices, nanorods and quantum dots, we were interested in whether the quantum size effects (quantum confinement), quantum (de)coherence and influence of boundary conditions, strengthen or weaken in nanosamples. Finally, this paper describes how the dimensional confinement of phonons in nanostructures leads to modifications in the electronic, optical, acoustic, superconducting and thermodynamic properties of quantum.1 Associate Professor, stevo.jacimovski@kpa.edu.rs 2 Academician, Full Professor, jovan.setrajcic@df.uns.ac.rs[68] NBP • Žurnal za kriminalistiku i pravo Stevo K. Jacimovski, Jovan P. Setrajcic Thermal properties of nanostructures have recently attracted a lot of attention. The influence of size effects on thermal conductivity is becoming extremely important for device design and reliability. On the basis of the calculated dispersion law and distribution of phonon states in nanoscopic crystals, free energy and entropy will be calculated. Internal energy as well as heat capacitance will also be analyzed.

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Thermodynamical properties of ultrathin layered structures

Cited by 15 publications

References 8 publications

Phonon Participation in Thermodynamics and Superconductive Properties of Thin Ceramic Films

Phonon Participation in Thermodynamics and Superconductive Properties of Thin Ceramic Films

Phonon contribution to heat capacitance of nanolayered crystalline structures

Review of results of theoretical approaches to phonon engineering of thermodynamic properties for different quantum structures

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