Recent progress in p-type thermoelectric magnesium silicide based solid solutions

Boor, Johannes de; Dasgupta, Titas; Saparamadu, Udara; Müller, Eckhard; Ren, Zhifeng

doi:10.1016/j.mtener.2017.04.002

Cited by 84 publications

(71 citation statements)

References 119 publications

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“…For the same dopant concentration a clear decreases of S with increasing x can be observed, indicating an increasing carrier concentration (note that for the x = 0.2 has different Li concentration). This in turn points towards a dependence of dopant activation or incorporation on the Si:Sn ratio, in agreement with previous studies [25,26] and the summarized results in a recent review [10]. The samples with low x also exhibit worse functional homogeneity, partially because local fluctuations in composition become more visible at low carrier concentration levels.…”

Section: Resultssupporting

confidence: 91%

“…On the other hand, for binary Mg 2 Si, a milling duration of 6 h was found to be sufficient as also reported previously [28,29], presumably because only one phase could be formed. We study the effects of sintering temperature and holding time especially in Mg 1.98 Li 0.02 Si 0.4 Sn 0.6 because this composition has so far the best properties with the > 0.5 [10,11]. Fig.…”

Section: Effect Of Milling Time On Homogeneitymentioning

confidence: 99%

“…For n-type, good thermoelectric properties have been reported for binary Mg 2 Si with ~1 [6,7], and particularly for solid solutions with compositions around Mg 2 Si 0.4 Sn 0.6 reaching 1≤ ≤1.5 [8,9]. However, p-type Mg 2 (Si,Sn) has inferior properties in comparison to n-type, partially due to a less favourable band structure, lower dominant carrier type mobility and insufficient dopant activation [10]. Recently, there has been progress on fabricating complementary p-type materials and improved zT > 0.5 has been observed [9,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of p-type Mg2Si1-xSnx with x = 0-1 and optimization of the synthesis parameters

Kamila

Sankhla

Yasseri

et al. 2019

Materials Today: Proceedings

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Mg 2 Si is a promising thermoelectric material in the mid-temperature region 500 -800 K.Development of Mg 2 Si based thermoelectric generators requires both good n-and p-type materials. While the thermoelectric properties n-type Mg 2 (Si,Sn) materials are good, those of the corresponding p-type are not as much. Therefore, optimizing p-type solid solution of magnesium silicide and magnesium stannide is highly desired. We employ high energy ball milling for efficient synthesis of p-type Mg 2 (Si,Sn) and investigate the effect of milling time, sintering temperature, and holding time on the thermoelectric properties of p-type Mg 2 Si 1-x Sn x with x = 0-1. We can show the synthesis of p-type Mg 2 (Si,Sn) for the whole compositions using Li as a dopant. We have also studied the effect of the synthesis parameters (milling time, sintering temperature, and holding time) on the phase purity, functional homogeneity and thermoelectric properties. The phase purity increases with longer milling time. The functional homogeneity decreases with higher sintering temperature and longer holding time.The optimum synthesis condition for x = 0.6 leads to ~ 0.6 at 700 K, which is one of the highest value reported for p-type Mg 2 (Si,Sn).

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Section: Resultssupporting

confidence: 91%

Section: Effect Of Milling Time On Homogeneitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of p-type Mg2Si1-xSnx with x = 0-1 and optimization of the synthesis parameters

Kamila

Sankhla

Yasseri

et al. 2019

Materials Today: Proceedings

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“…In addition, they exhibit high power output per unit mass compared to many other TE materials due to their low density values. [10][11][12] These attributes have caused intense interest in Mg2Si-Mg2Sn solid solutions as thermoelectric (TE) materials for large scale commercial applications. 1,[12][13][14] The ambient temperature phase diagrams of these Zintl phases suggests that the Mg2Sn and Mg2Si are the only stable compound (only compound present) and that they are line compounds.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12] These attributes have caused intense interest in Mg2Si-Mg2Sn solid solutions as thermoelectric (TE) materials for large scale commercial applications. 1,[12][13][14] The ambient temperature phase diagrams of these Zintl phases suggests that the Mg2Sn and Mg2Si are the only stable compound (only compound present) and that they are line compounds. 4 A denser, trigonal 'high pressure' binary phase in the Mg-Sn has been reported, but it has been understudied because of its processing difficulties-high pressures (> 1 GPA) are typically required for synthesis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, processing and transport properties of cubic and trigonal solid solutions in the Mg-Si-Sn system

Sellappan

Fong

Murata

et al. 2018

Journal of Alloys and Compounds

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Mg-Si-Sn solid solutions have interesting and useful semiconducting properties particularly for thermoelectric applications. While cubic solid solutions have been prepared by a variety of methods, solid solutions with a trigonal crystal structure have not been reported. We employed a combination of high energy ball milling and current activated pressure assisted densification (CAPAD) to induce and complete phase transformation from cubic to trigonal phase, forming dense trigonal composites. This is the first successful preparation of the trigonal phase in Mg-Si-Sn stem. In addition, we report the transport properties of both the cubic and trigonal composites measured in the 160 to 400 K range. The electrical conductivity of the trigonal composites was several times higher compared to the cubic counterparts while thermal conductivity is lower but in the range of previously reported Mg-Si-Sn materials. The Seebeck coefficient of the trigonal composites is lower compared to the cubic samples, leading to low ZT values. The ZT of the cubic samples, however is higher than previously reported for un-doped Mg-Si-Sn solid solutions which is promising for thermoelectric applications.

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Efficiency Measurement and Modeling of a High‐Performance Mg₂(Si,Sn)‐Based Thermoelectric Generator

et al. 2022

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Mg2(Si,Sn) is an attractive material class due to its excellent thermoelectric (TE) properties, its eco‐friendly constituents, its low mass density, and its low price. A lot of research has been done on optimizing its TE properties; however, works on its use in thermoelectric generators (TEG) are scarce. Herein, the first conversion efficiency measurement of a functional, fully Mg2(Si,Sn)‐based TEG, approaching a maximum value of 4% for an applied ΔT = 375 °C, is shown. A maximum power density of 0.9 W cm−2 (related to the cross‐sectional area of the TE legs) at ΔT=375 °C is also reported, which is among the highest performance of silicide‐based modules reported in literature. Efficiency measurements can be tricky due to the uncertainty of heat flow measurement and parasitic heat losses; therefore, assessing the measurement reliability by confronting it to theoretical calculations is necessary. TEG device simulation in a constant property model is used to compare measured data to expected values and a good match is found (<1% deviation for current at maximum power, <4% difference for maximum power output, deviation within measurement uncertainty range for heat flows and efficiency). The significant discrepancy between measurement and calculations of the inner electrical resistance reveals room for improvement. Cracks form due to thermally induced mechanical stress, which dramatically increase the inner electrical resistance. It is shown that by avoiding those cracks, the maximum power output and conversion efficiency of the TEG could be improved by 30%.

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Recent progress in p-type thermoelectric magnesium silicide based solid solutions

Cited by 84 publications

References 119 publications

Synthesis of p-type Mg2Si1-xSnx with x = 0-1 and optimization of the synthesis parameters

Synthesis of p-type Mg2Si1-xSnx with x = 0-1 and optimization of the synthesis parameters

Synthesis, processing and transport properties of cubic and trigonal solid solutions in the Mg-Si-Sn system

Efficiency Measurement and Modeling of a High‐Performance Mg₂(Si,Sn)‐Based Thermoelectric Generator

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Recent progress in p-type thermoelectric magnesium silicide based solid solutions

Cited by 84 publications

References 119 publications

Synthesis of p-type Mg2Si1-xSnx with x = 0-1 and optimization of the synthesis parameters

Synthesis of p-type Mg2Si1-xSnx with x = 0-1 and optimization of the synthesis parameters

Synthesis, processing and transport properties of cubic and trigonal solid solutions in the Mg-Si-Sn system

Efficiency Measurement and Modeling of a High‐Performance Mg2(Si,Sn)‐Based Thermoelectric Generator

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Efficiency Measurement and Modeling of a High‐Performance Mg₂(Si,Sn)‐Based Thermoelectric Generator