Journal ArticleDOI
Thermal Conductivity of Transition Metal Carbides
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TLDR
In this paper, it was shown that at high temperatures, point-defect scattering of phonons by carbon vacancies in the non-stoichiometric compounds dominate thermal conductivities of transition metal carbides.Abstract:
Transition metal carbides, such as TiC, exhibit very low thermal conductivities (K) at low temperatures. The lattice conductivity at such temperatures is severely limited by phonon scattering by conduction electrons. At high temperatures, point-defect scattering of phonons by carbon vacancies in the non-stoichiometric compounds dominate K. Scattering of electrons by the vacancies limits the electronic contribution. Above ~1000oC the thermal conductivity of the carbides is increased by ambipolar diffusion.read more
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Book ChapterDOI
Theory of Thermal Conductivity
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Ultra-High Temperature Materials II: Refractory Carbides I (Ta, Hf, NB and Zr Carbides)
TL;DR: In this paper, a thorough treatment of ultra-high temperature materials with melting points around or over 2500 °C is presented, which can be applied in various engineering devices and environmental conditions in the wide range from cryogenic to ultra high temperatures, on the basis of the latest updates in the field of physics, chemistry, nanotechnology, materials science and engineering.
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References
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Journal ArticleDOI
Model for Lattice Thermal Conductivity at Low Temperatures
TL;DR: In this article, a phenomenological model is developed to facilitate calculation of lattice thermal conductivities at low temperatures, where the phonon scattering processes can be represented by frequency-dependent relaxation times.
Journal ArticleDOI
The Scattering of Low-Frequency Lattice Waves by Static Imperfections
TL;DR: In this article, the scattering of lattice waves by static imperfections is treated by second-order perturbation theory, where the transition matrix is composed of contributions due to the mass difference of the lattice points, changes in the elastic constants of linkages between lattice point, and elastic strain.
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