High Thermoelectric Performance in Mg2(Si0.3Sn0.7) by Enhanced Phonon Scattering

Goyal, Gagan K.; Mukherjee, Shriparna; Mallik, Ramesh Chandra; Vitta, Satish; Samajdar, Indradev; Dasgupta, Titas

doi:10.1021/acsaem.8b02148

Cited by 52 publications

(38 citation statements)

References 51 publications

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“…Mg 1.98 Cr 0.02 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 recorded a maximum ZT value of 1.82 at 673 K, which is higher than any metal silicide thermoelectric material currently being produced. It also recorded an efficiency of 19.36% at 673 K. These results are in line with those of Goyal et al (2019), who doped Mg 2 Si 0.3 Sn 0.7 with bismuth (Bi) and chromium (Cr). Goyal et al found that the Bi increased the electrical conductivity due to band convergence, and introducing Cr caused embedded Cr and Sn nanoprecipitates to form within the material, helping to keep the thermal conductivity as low as possible [44].…”

Section: Enhanced Mid-temperature Thermoelectric Materialssupporting

confidence: 89%

“…The reason for this drop in ZT is that in all four materials the thermal conductivity starts to increase rapidly from 500 K. This is because at 500 K MgAgSb starts transitioning away from the tetragonal α-MgAgSb into its intermediate tetragonal phase, β-MgAgSb. Then, at 650 K, it transitions into γ-MgAgSb, which has a cubic structure and is a poor thermoelectric material [43]. One reason for this is that it causes a large drop in carrier concentration and therefore electrical conductivity.…”

Section: Enhanced Mid-temperature Thermoelectric Materialsmentioning

confidence: 99%

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Computationally Modelling the Use of Nanotechnology to Enhance the Performance of Thermoelectric Materials

Spriggs

Wang

2020

Energies

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The increased focus on global climate change has meant that the thermoelectric market has received considerably more attention. There are many processes producing large amounts of waste heat that can be utilised to generate electrical energy. Thermoelectric devices have long suffered with low efficiencies, but this can be addressed in principle by improving the performance of the thermoelectric materials these devices are manufactured with. This paper investigates the thermoelectric performance of market standard thermoelectric materials before analysing how this performance can be improved through the adoption of various nanotechnology techniques. This analysis is carried out through the computational simulation of the materials over low-, mid- and high-temperature ranges. In the low-temperature range, through the use of nanopores and full frequency phonon scattering, Mg0.97Zn0.03Ag0.9Sb0.95 performed best with a ZT value of 1.45 at 433 K. Across the mid-temperature range a potentially industry leading ZT value of 2.08 was reached by AgSbTe1.85Se0.15. This was carried out by simulating the effect of band engineering and the introduction of dense stacking faults due to the addition of Se into AgSbTe2. AgSbTe1.85Se0.15 cannot be implemented in devices operating above 673 K because it degrades too quickly. Therefore, for the top 200 K of the mid-temperature range a PbBi0.002Te–15% Ag2Te nanocomposite performed best with a maximum ZT of 2.04 at 753 K and maximum efficiency of 23.27 at 813 K. In the high-temperature range, through the doping of hafnium (Hf) the nanostructured FeNb0.88Hf0.12Sb recorded the highest ZT value of 1.49 at 1273 K. This was closely followed by Fe1.05Nb0.75Ti0.25Sb, which recorded a ZT value of 1.31 at 1133 K. This makes Fe1.05Nb0.75Ti0.25Sb an attractive substitute for FeNb0.88Hf0.12Sb due to the much lower cost and far greater abundance of titanium (Ti) compared with hafnium.

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Section: Enhanced Mid-temperature Thermoelectric Materialssupporting

confidence: 89%

Section: Enhanced Mid-temperature Thermoelectric Materialsmentioning

confidence: 99%

Computationally Modelling the Use of Nanotechnology to Enhance the Performance of Thermoelectric Materials

Spriggs

Wang

2020

Energies

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“…The best results are obtained using multiple substitutions on both the magnesium and the silicon sites. These have led to materials with zT often exceeding 1.3 at 700 K with a record high zT of 1.7 for Mg 1.98 Cr 0.02 (Si 0.3 Sn 0.7 ) 0.98 Bi 0.02 at 680 K [788], although the stability, at the operating temperature, of the silico-stannides still being under investigation.…”

Section: Silicide Thermoelectricsmentioning

confidence: 99%

“…Figure 13. The maximum thermoelectric figure of merit, zT, of selected n-type magnesium silicides: Mg2Si0.97Bi0.03 [806], Mg2Si0.5875Sn0.4Sb0.0125 [807], Mg1.995La0.005Si0.58Sn0.42 [808], Mg2.10Si0.38Sn0.6Sb0.02 [809], Mg2Si0.487Sn0.5Sb0.013 [810], Mg2(Si0.3Sn0.7)0.975Sb0.025 [811], Mg2Si0.6Ge0.4B i0.02 [812], Mg2Si0.385Sn0.6Sb0.015 [813], Mg2Si0.3925Sn0.6Sb0.0075 [814], Mg2(Si0.4Sn0.6)0.97Bi0.03 [815], Mg2Si0.57Sn0.4Bi0.03 [816], Mg2.2Si0.49Sn0.5Sb0.01 [817], (Mg2.06Si0.3Sn0.68Bi0.02 [818], Mg2Si0.35Sn0.62Bi0.03 [819], Mg2(Si0.4Sn0.6)0.82Sb0.18 [820], Mg2Si0.53Sn0.4Ge0.05Bi0.02 [821], Mg2.08Si0.364Sn0.6Sb0.036 [789], Mg2.08Si0.37Sn0.6Bi0.03 [822], Mg1.98Cr0.02(Si0.3Sn0.7)0.98Bi0.02 [788]. Material Material Material Material Material 3.12.…”

Section: Silicide Thermoelectricsmentioning

confidence: 99%

Key properties of inorganic thermoelectric materials—tables (version 1)

et al. 2022

Self Cite

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This paper presents tables of key thermoelectric properties, which define thermoelectric conversion efficiency, for a wide range of inorganic materials. The 12 families of materials included in these tables are primarily selected on the basis of well established, internationally-recognised performance and their promise for current and future applications: Tellurides, Skutterudites, Half Heuslers, Zintls, Mg-Sb Antimonides, Clathrates, FeGa3–type materials, Actinides and Lanthanides, Oxides, Sulfides, Selenides, Silicides, Borides and Carbides. As thermoelectric properties vary with temperature, data are presented at room temperature to enable ready comparison, and also at a higher temperature appropriate to peak performance. An individual table of data and commentary are provided for each family of materials plus source references for all the data.

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“…Many studies denote that the doped Cr could promote the formation of nanoprecipitates, resulting in the reduction of the lattice thermal conductivity (κ L ) [12,13]. The Co-doped Cr and Bi could result in a ∼15% reduction in the lattice thermal conductivity (κ L ) compared to the only Bi doped sample while retaining similar PF values [13]. Along these lines, in this work, Cr/Sb is co-doped into Mg 2 Si 0.3 Sn 0.7 .…”

Section: Introductionmentioning

confidence: 99%

Impact of Cr content on the thermoelectric properties of the Cr/Sb co-doped Mg2.2−xCrx(Si0.3Sn0.7)0.98Sb0.02 compound

Ju¹,

Fang²,

Cai³

et al. 2022

Mater. Res. Express

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The n-type Cr/Sb co-doped Mg2.2-xCrx(Si0.3Sn0.7)0.98Sb0.02 (0.0025≤x≤0.01) compounds were successfully fabricated by applying the solid state reaction-spark plasma sintering (SPS) technique. The impact of the active Cr content on the thermoelectric properties of the co-doped compound was systematically studied. Insights from the x-ray diffraction (XRD) results indicate the existence of single-phase material of the prepared compounds. Interestingly, the lattice constant and the electrical conductivity of the samples increases with the decrease of the Seebeck coefficient as the Cr content is becomes bigger. All the fabricated compounds could achieve an excellent power factor (PF) of 3.8-4.9 mWm-1K-2 in the range of 300-800K. The lattice thermal conductivity declines with the increasing Cr amount. More specifically, the lowest κL of about 0.5 W∙m-1∙K-1 was obtained while x=0.01 at 650 K. The figure of merit (ZT) is also reduced by increasing the Cr content. A high ZT value of 1.4 was obtained while x=0.0025 at 700 K.

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High Thermoelectric Performance in Mg₂(Si_0.3Sn_0.7) by Enhanced Phonon Scattering

Cited by 52 publications

References 51 publications

Computationally Modelling the Use of Nanotechnology to Enhance the Performance of Thermoelectric Materials

Computationally Modelling the Use of Nanotechnology to Enhance the Performance of Thermoelectric Materials

Key properties of inorganic thermoelectric materials—tables (version 1)

Impact of Cr content on the thermoelectric properties of the Cr/Sb co-doped Mg2.2−xCrx(Si0.3Sn0.7)0.98Sb0.02 compound

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