Introduction

Snarskiı̆, A. A.; Bezsudnov, Igor V.; Sevryukov, Vladimir A.; Morozovskiy, Alexander; Malinsky, Joseph

doi:10.1007/978-1-4419-8291-9_1

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“…Webman, Jortner and Cohen (WJC) derived a different equation for the thermopower by applying the EMT to Onsager equations. They assumed that corrections for both s e and l e are small due to thermoelectric effects 24,25 and wrote a e as follows: where D 0 = (2s e + s)(2k e + k). If the system is limited to two components, the development, in a similar way as the abovementioned equations of the EMT, yields…”

Section: Webman-jortner-cohen (Wjc) Model For the Thermopowermentioning

confidence: 99%

“…However, it should be underlined that these theoretical models uses some simplifications. More specifically, interface effects such as electron filtering (able to increase the thermopower in specific cases 21,26,27 ), or the influence of thermoelectric effects on both the electrical resistivity and thermal conductivity (that may trigger peculiar phenomena close to the percolation threshold 25 ) are not taken into account.…”

Section: Webman-jortner-cohen (Wjc) Model For the Thermopowermentioning

confidence: 99%

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Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si₁₀As₁₅Te₇₅–Bi_0.4Sb_1.6Te₃

et al. 2015

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Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass-crystal composite system Si 10 As 15 Te 75 -Bi 0.4 Sb 1.6 Te 3 † We report on the theoretical predictions of the effective medium theory (EMT) and its generalized version taking into account percolation theory (GEMT) on the thermoelectric properties of composites based on Landauer and Sonntag's equations. The results were tested experimentally on composites composed of the glassy phase Si 10 As 15 Te 75 and the crystalline phase Bi 0.4 Sb 1.7 Te 3 . The evolution of the electrical resistivity and thermal conductivity with the fraction of crystalline phase matches very well the experimental data, although the GEMT model fails to predict the thermopower. A better agreement between theory and experiment could be obtained by combining the principles of the GEMT and the Webman-Jortner-Cohen models. Despite the fact that the GEMT model originally predicts the possibility to optimize the dimensionless figure of merit ZT of composites by adjusting the fraction and the values of the transport properties of each phase, the new model developed rules out any beneficial influence on the ZT values. These results confirm within a different framework the early conclusions of Bergman regarding the impossibility of improving the ZT values using multi-phased materials.

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Section: Webman-jortner-cohen (Wjc) Model For the Thermopowermentioning

confidence: 99%

Section: Webman-jortner-cohen (Wjc) Model For the Thermopowermentioning

confidence: 99%

Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si₁₀As₁₅Te₇₅–Bi_0.4Sb_1.6Te₃

et al. 2015

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Introduction

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Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si₁₀As₁₅Te₇₅–Bi_0.4Sb_1.6Te₃

Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si₁₀As₁₅Te₇₅–Bi_0.4Sb_1.6Te₃

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Introduction

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Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si10As15Te75–Bi0.4Sb1.6Te3

Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si10As15Te75–Bi0.4Sb1.6Te3

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Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si₁₀As₁₅Te₇₅–Bi_0.4Sb_1.6Te₃

Effective medium theory based modeling of the thermoelectric properties of composites: comparison between predictions and experiments in the glass–crystal composite system Si₁₀As₁₅Te₇₅–Bi_0.4Sb_1.6Te₃