Thermal Conductivity and Lattice Vibrational Modes

Klemens, P. G.

doi:10.1016/s0081-1947(08)60551-2

Cited by 739 publications

(342 citation statements)

References 91 publications

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“…From our modeling, the expected Γ LW for phonons with large v g range from 0.01 to 0.3 meV, much smaller than the instrument resolution. Because of approximations in expressions for the phonon scattering rate [54,55], our model is not expected to correctly predict linewidths away from zone-center, where v g is small, but these modes contribute very little to κ L anyway.…”

Section: B Thermal Conductivitymentioning

confidence: 97%

Lattice dynamics and thermal transport in multiferroicCuCrO2

et al. 2017

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Inelastic neutron and x-ray scattering measurements of phonons and spin waves were performed in the delafossite compound CuCrO2 over a wide range of temperature, and complemented with first-principles lattice dynamics simulations. The phonon dispersions and density of states are well reproduced by our density functional calculations, and reveal a strong anisotropy of Cu vibrations, which exhibit low-frequency modes of large amplitude parallel to the basal plane of the layered delafossite structure. The low frequency in-plane modes also show a systematic temperature dependence of neutron and x-ray scattering intensities. In addition, we find that spin fluctuations persist above 300 K, far above the Néel temperature for long-range antiferromagnetic order, T N ≃ 24 K. Our modeling of the thermal conductivity, based on our phonon measurements and simulations, reveals a significant anisotropy and indicates that spin fluctuations above T N constitute an important source of phonon scattering, considerably suppressing the thermal conductivity compared to that of the isostructural but non-magnetic compound CuAlO2.

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Section: B Thermal Conductivitymentioning

confidence: 97%

Lattice dynamics and thermal transport in multiferroicCuCrO2

et al. 2017

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“…The phonon-phonon interactions contributing to the thermal resistance in a crystalline material are the normal and Umklapp threephonon processes 21,26 . The three-phonon process relaxation time depends on the nature of the phonon spectrum 22,27 .…”

Section: Phonon-phonon Scatteringmentioning

confidence: 99%

Diffusive nature of thermal transport in stanene

Nissimagoudar

Manjanath

Singh

2016

Phys. Chem. Chem. Phys.

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Using the phonon Boltzmann transport formalism and density functional theory based calculations, we show that stanene has a low thermal conductivity. For a sample size of 1×1 µm 2 (L × W ), the lattice thermal conductivities along the zigzag and armchair directions are 10.83 W/m-K and 9.2 W/m-K respectively, at room temperature, indicating anisotropy in the thermal transport. The low values of thermal conductivity are due to large anharmonicity in the crystal resulting in high Grüneisen parameters, and low group velocities. The room temperature effective phonon mean free path is found to be around 17 nm indicating that the thermal transport in stanene is completely diffusive in nature. Furthermore, our study brings out the relative importance of the contributing phonon branches and reveals that, at very low temperatures, the contribution to lattice thermal conductivity comes from the flexural acoustic (ZA) branch and at higher temperatures it is dominated by the longitudinal acoustic (LA) branch. We also show that lattice thermal conductivity of stanene can further be reduced by tuning the sample size and creating rough surfaces at the edges. Such tunability in the lattice thermal conductivity in stanene suggests its applications in thermoelectric devices.

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“…The thermal expansion depends linearly on the frequency dependent Grüneisen parameter, while the thermal conductivity depends on the square of the Grüneisen parameter. 21,22 To more clearly identify the effects of crystallography, we determined the thermal conductivity of HoGaO 3 in both the orthorhombic and hexagonal structures; although the orthorhombic structure has the lower energy, the hexagonal structure is metastable allowing the determination of its thermal transport properties. As Fig.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Elastic and thermal properties of hexagonal perovskites

Chernatynskiy

Auguste

Steele

et al. 2016

Computational Materials Science

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We systematically investigate the mechanical and thermal properties of the P6 3 cm hexagonal perovskites with composition A 3+ B 3+ O 3 for potential use in thermal barrier coatings. In spite of the structural anisotropy, the elastic constants are essentially isotropic. The thermal expansion is, however, strongly anisotropic, while the thermal conductivity is relatively isotropic. The thermal conductivities of the hexagonal perovskites are much larger than those of the orthorhombic perovskites.

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Thermal Conductivity and Lattice Vibrational Modes

Cited by 739 publications

References 91 publications

Lattice dynamics and thermal transport in multiferroicCuCrO2

Lattice dynamics and thermal transport in multiferroicCuCrO2

Diffusive nature of thermal transport in stanene

Elastic and thermal properties of hexagonal perovskites

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