Thermodynamische Eigenschaften von IV–VI-Verbindungen: Bleichalkogenide / Thermodynamic Properties of IV–VI-Compounds: Leadchalcogenides

Blachnik, R.; Igel, Rudolf

doi:10.1515/znb-1974-9-1012

Cited by 135 publications

(63 citation statements)

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“…The heat capacity C p was determined using the equation C p /k B atom À1 ¼ 3.07 + 4.7 Â 10 À4 (T/K-300) by tting high quality measurement results. 77 All properties are isotropic based on a previous study on PbSe. For each measurement data were collected during both heating and cooling and no hysteresis or change in properties were observed.…”

Section: Experimental Methodsmentioning

confidence: 99%

Thermoelectric alloys between PbSe and PbS with effective thermal conductivity reduction and high figure of merit

Wang

Cao

et al. 2014

J. Mater. Chem. A

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The n-type alloys between PbSe and PbS are studied. The effect of alloy composition on transport properties is evaluated and the results are interpreted with theories based on random atomic site substitution. The alloying in PbSe 1Àx S x brings thermal conductivity reduction, carrier mobility reduction as well as change of effective mass. When all these factors are evaluated, both experimentally and theoretically, the optimized thermoelectric performance is found to change gradually with alloy composition. High zT can be found in all PbSe 1Àx S x alloys. The possibility of achieving significant improvement of zT through alloying is also discussed.

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Section: Experimental Methodsmentioning

confidence: 99%

Thermoelectric alloys between PbSe and PbS with effective thermal conductivity reduction and high figure of merit

Wang

Cao

et al. 2014

J. Mater. Chem. A

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“…The C p values, in units of J/gK, were approximated by the relation 0.171 + 2.65 × 10 −5 T , where T is the temperature. 26 The geometrical dimensions of the specimens and their masses were used to determine their mass density that typically was found to be in the range 7.9 ≤ ρ ≤ 8.14 g/cm 3 , i.e. a 2.5-4% difference from the theoretical value 8.24 g/cm 3 .…”

Section: Methodsmentioning

confidence: 99%

“…49 Taking into account that κ l ≈ (1/3)C v ℓ ph υ, where C v the heat capacity under constant volume and υ is the sound velocity, and that for T>300 K both compounds exhibit a similar α, 50 one can calculate the ratio of κ P bT e l /κ P bSe l ∼ 1.03 at 700 K on assuming the same sound velocity in the two compounds and that C v ≈ C p . The heat capacity data were taken from Blachnik et al 26 while the γ values from Walker et al 48 were used. The experimental value of the lattice thermal conductivity ratio of PbTe to PbSe at 700 K is 0.99.…”

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confidence: 99%

High-temperature thermoelectric properties ofn-type PbSe doped with Ga, In, and Pb

Androulakis¹,

Lee²,

Todorov

et al. 2011

Phys. Rev. B

109

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We report a systematic study of the thermoelectric properties of PbSe doped with Ga, In and excess Pb as a function of carrier density and temperature. All metal dopants efficiently generate electron carriers in the crystal lattice with densities as high as ∼ 10 20 cm −3 measured by the Hall effect. The Seebeck coefficient as a function of carrier density at room temperature was found to be similar for all dopants, while at 700K substantial differences were observed with PbSe-In exhibiting a larger response. Infra-red spectral reflectivity measurements at room temperature showed that both Ga and In substitution in PbSe weakens the curvature of the dispersion relation of the conduction band compared to Pb. This electronic effect contributes a larger density of states in transport processes at high-temperatures. We have obtained thermoelectric figures of merit of ∼ 0.9 at 900K, exceeding that of PbTe for T>800K.

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“…Thermal conductivity is calculated from k ¼ DC p d, where D is the thermal diffusivity, C p is the heat capacity, and d is the density. The specific heat per unit mass of the PbSe was used literature values 47 of the heat capacity of PbSe:…”

Section: Nanostructuring and Temmentioning

confidence: 99%

Contrasting role of antimony and bismuth dopants on the thermoelectric performance of lead selenide

et al. 2014

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Increasing the conversion efficiency of thermoelectric materials is a key scientific driver behind a worldwide effort to enable heat to electricity power generation at competitive cost. Here we report an increased performance for antimony-doped lead selenide with a thermoelectric figure of merit of B1.5 at 800 K. This is in sharp contrast to bismuth doped lead selenide, which reaches a figure of merit of o1. Substituting antimony or bismuth for lead achieves maximum power factors between B23-27 mWcm À 1 K À 2 at temperatures above 400 K. The addition of small amounts (B0.25 mol%) of antimony generates extensive nanoscale precipitates, whereas comparable amounts of bismuth results in very few or no precipitates. The antimony-rich precipitates are endotaxial in lead selenide, and appear remarkably effective in reducing the lattice thermal conductivity. The corresponding bismuth-containing samples exhibit smaller reduction in lattice thermal conductivity.

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Thermodynamische Eigenschaften von IV–VI-Verbindungen: Bleichalkogenide / Thermodynamic Properties of IV–VI-Compounds: Leadchalcogenides

Cited by 135 publications

References 0 publications

Thermoelectric alloys between PbSe and PbS with effective thermal conductivity reduction and high figure of merit

Thermoelectric alloys between PbSe and PbS with effective thermal conductivity reduction and high figure of merit

High-temperature thermoelectric properties ofn-type PbSe doped with Ga, In, and Pb

Contrasting role of antimony and bismuth dopants on the thermoelectric performance of lead selenide

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