The Molar Heats of Lead Sulphide, Selenide and Telluride in the Temperature Range 20 K to 260 K

Parkinson, D H; Quarrington, J E

doi:10.1088/0370-1298/67/7/301

Cited by 78 publications

(40 citation statements)

References 7 publications

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“…The calculated results for the specific heat at constant volume (C v ) agree very well with experimental measurements 33 in the low temperature range up to 50 K, as seen in Fig. 2.…”

Section: Lattice Specific Heatsupporting

confidence: 85%

Anharmonic effects in the thermoelectric properties of PbTe

Al-Otaibi

Srivastava

2014

Journal of Applied Physics

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In this work, we investigate the crystal anharmonic effects in the thermoelectric properties of n-type PbTe. The lattice thermal transport coefficient is computed by employing an isotropic continuum model for the dispersion relation for acoustic as well as optical phonon branches, an isotropic continuum model for crystal anharmonicity, and the single-mode relaxation time scheme. The electronic components of the transport coefficients in a wide temperature range are calculated using the isotropic-nearly-free-electron model, interaction of electrons with deformation potential of acoustic phonons, and the effect of the band non-parabolicity. It is found that the transverse optical branches play a major role in determining the phonon conductivity and the thermoelectric figure of merit of this material.

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“…The calculated results for the specific heat at constant volume (C v ) agree very well with experimental measurements 33 in the low temperature range up to 50 K, as seen in Fig. 2.…”

Section: Lattice Specific Heatsupporting

confidence: 85%

Anharmonic effects in the thermoelectric properties of PbTe

Al-Otaibi

Srivastava

2014

Journal of Applied Physics

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“…15,19,29,30 The specific heat depends on the phonon densities of states, D͑͒, ͑right panels of Figs. 1-3͒.…”

Section: Specific Heatmentioning

confidence: 99%

Near Kohn anomalies in the phonon dispersion relations of lead chalcogenides

2009

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We present ab initio phonon dispersion relations for the three lead chalcogenides PbS, PbSe, and PbTe. The acoustic branches are in very good agreement with inelastic neutron-scattering data and calculations of the specific heat give good agreement with experimental data. The pronounced minimum of the transverse-optical branch at ⌫ due to the near ferroelectricity of the lead chalcogenides is qualitatively reproduced. In addition, we find a pronounced dip in the longitudinal-optical branch at ⌫. This dip was previously explained as the effect of "free carriers" ͑due to the presence of impurities͒. The calculations demonstrate that it persists also in the case of pure lead chalcogenides. We explain the dip as a "near Kohn anomaly" which is associated with the small electronic band gap at the high-symmetry point L.

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“…This behaviour suggests that interfacial vibrational energy transport at the measured temperatures is dominated by elastic events, whereby the frequencies of the interacting states are the same, and can be understood by considering the vDOS. Below a temperature of 200 K, which is near the Debye temperatures (θ D ) of CdSe, PbS, PbSe and 20) increasing the temperature increases the populations of vibrational states with frequencies that are common to the cores and ligands. When the temperature increases beyond the core θ D , the vibrational frequencies common to the cores and ligands are fully activated.…”

mentioning

confidence: 99%

Surface chemistry mediates thermal transport in three-dimensional nanocrystal arrays

et al. 2013

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Arrays of ligand-stabilized colloidal nanocrystals with sizetunable electronic structure are promising alternatives to single-crystal semiconductors in electronic, optoelectronic and energy-related applications 1-5 . Hard/soft interfaces in these nanocrystal arrays (NCAs) create a complex and uncharted vibrational landscape for thermal energy transport that will influence their technological feasibility. Here, we present thermal conductivity measurements of NCAs (CdSe, PbS, PbSe, PbTe, Fe 3 O 4 and Au) and reveal that energy transport is mediated by the density and chemistry of the organic/inorganic interfaces, and the volume fractions of nanocrystal cores and surface ligands. NCA thermal conductivities are controllable within the range 0.1-0.3 W m −1 K −1 , and only weakly depend on the thermal conductivity of the inorganic core material. This range is 1,000 times lower than the thermal conductivity of silicon, presenting challenges for heat dissipation in NCA-based electronics and photonics. It is, however, 10 times smaller than that of Bi 2 Te 3 , which is advantageous for NCA-based thermoelectric materials.Colloidal nanocrystals self-assemble into NCAs with electronic and optical properties that can be broadly tuned by nanocrystal composition and size 1-4,6-8 . To be considered as viable replacements for traditional semiconductors, NCA-based technologies must also meet thermal management demands as high operating temperatures degrade device performance and lifetime. Thermal conductivity (k) quantifies a material's ability to dissipate heat and relates temperature gradient (∇T ) to heat flux (q) through Fourier's law, q = −k∇T . In metals, most heat is carried by electrons, whereas in semiconductor and insulating crystals, thermal conductivity arises from the transport and scattering of quantized vibrations that are born from the periodic atomic lattice, that is, phonons. Our NCAs are non-metallic and have a vibrational structure that is complicated by compositional heterogeneity and periodicity at two length scales: the atomic lattice within each core and the array of periodic cores separated by ligand monolayers. Studies of planar self-assembled monolayer (SAM) junctions show that surface chemistry can control energy transport at the interface between two solids 9 , but does it also influence the thermal conductivity of a bulk three-dimensional solid with a complex network of internal interfaces? We herein report on the hitherto unknown thermal transport properties of NCAs, using systematic thermal conductivity measurements complemented by heat capacity measurements and atomistic simulations.A series of NCAs was prepared with varying core diameters, core materials and ligand groups (Table 1) through spin-coating concentrated colloidal solutions onto silicon wafers 6 . During film

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The Molar Heats of Lead Sulphide, Selenide and Telluride in the Temperature Range 20 K to 260 K

Cited by 78 publications

References 7 publications

Anharmonic effects in the thermoelectric properties of PbTe

Anharmonic effects in the thermoelectric properties of PbTe

Near Kohn anomalies in the phonon dispersion relations of lead chalcogenides

Surface chemistry mediates thermal transport in three-dimensional nanocrystal arrays

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