On the influence of AgMg precursor formation on MgAgSb microstructure and thermoelectric properties

Rodriguez-Barber, Ignacio; Camut, Julia; Luhmann, Laura; Cowley, Aidan; Mueller, E.; Boor, Johannes de

doi:10.1016/j.jallcom.2020.158384

Cited by 9 publications

(12 citation statements)

References 42 publications

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“…Note that square root intensities are plotted for better visualization of the secondary phases, which are not discernible on the oen-employed linear plots. 8,16,26 If one compares the XRD scans of nc-8-2 and c-8-9, it is likely that c-8-9 contains less Mg 3 Sb 2 than nc-8-2 (lower intensity of the Mg 3 Sb 2 peaks of 25.5 or 34.5 in Fig. 3).…”

Section: Synthesis Process Optimization: Reproducible Resultsmentioning

confidence: 99%

“…This is in line with earlier results and speculations. 16,25,26 The effective composition was determined for each sample in order to observe its inuence on the thermoelectric properties.…”

Section: Synthesis Process Optimization: Reproducible Resultsmentioning

confidence: 99%

“…The stoichiometric amount of Mg (turnings, Merck KGaA, >99%), Ag (powder, <45 μm, Sigma Aldrich, >99.99%) was weighted according to the composition Mg x Ag y ( x = 1.02, 1.01, 1, 0.99, 0.98, 0.97, 0.94; y = 1, 0.97) and loaded in a stainless-steel jar (65 ml) with two stainless steel balls (12.7 mm diameter) under argon atmosphere. After a high-energy ball milling step for 8 hours (SPEX SamplePrep 8000D Mixer/Mill), the ball milling jar was cleaned while the Mg x Ag y powder was hot pressed for 8 minutes at 673 K under 85 MPa using graphite foils on top and bottom in a 12.7 mm diameter graphite dies (Dr Fritsch DSP510) as introduced by Rodriguez-Baber et al 26 The obtained Mg x Ag y pellet was then crushed in the high-energy ball mill for 18 minutes, followed by the addition of Sb (granules, 3–15 mm, Sindlhauser Materials GmbH, 99.999%) according to the stoichiometry Mg x Ag y Sb z ( z = 1, 0.995). The mixture was then milled for 5 more hours under argon atmosphere and finally hot pressed for n minutes ( n = 8–20–30–60 minutes) at 573 K under 85 MPa using the same graphite dies as before.…”

Section: Methodsmentioning

confidence: 99%

“…However, even though a synthesis route has been established 20 and repeatedly employed, the experimental results show that the thermoelectric properties are not easily reproducible. Indeed, several recent works on MgAgSb based devices report lower TE properties, zT avg = 0.9, 22 zT avg = 0.9, 25 zT avg = 0.77, 26 compared to the original publication of Liu et al reporting zT avg = 1.1 (ref. 16) even though all followed the same synthesis route.…”

Section: Introductionmentioning

confidence: 90%

“…16) even though all followed the same synthesis route. An in-depth analysis from I. Rodriguez-Barber et al 26 revealed that part of the explanation could be a variation in the formation of MgAg in the first ball milling step. He showed that the addition of a sintering step of MgAg before the addition of Sb into the mixture facilitates MgAg formation and hence improves the TE properties; this example shows how sensitive the material performance may react on synthesis details.…”

Section: Introductionmentioning

confidence: 99%

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Establishing synthesis–composition–property relationships for enhanced and reproducible thermoelectric properties of MgAgSb

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Section: Synthesis Process Optimization: Reproducible Resultsmentioning

confidence: 99%

Section: Synthesis Process Optimization: Reproducible Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Establishing synthesis–composition–property relationships for enhanced and reproducible thermoelectric properties of MgAgSb

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Semiconductor–Semimetal Composite Engineering Enabling Record‐High Thermoelectric Power Density for Low‐Temperature Energy Harvesting

Xie,

Peng,

Sun

et al. 2024

Adv Funct Materials

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Sustained thermoelectric efforts have concentrated on the enhancement of conversion efficiency of power generators, while simultaneously achieving high output power continues to lag. Specifically, the highest output power density of emerging Mg‐based modules reported so far is only half of that of commercial Bi2Te3‐based, mainly due to the low power factor of MgAgSb. Herein, homogenously distributed MgCuSb in situ nanoprecipitates in the MgAgSb matrix effectively optimized carrier concentration due to the effect of carrier injection from the metal–semiconductor Ohmic contact. As a result, a record‐high average power factor of 27.2 µW cm−1 K−2 is obtained in MgCu0.1Ag0.87Sb0.99 composite within the temperature range of 300–550 K, which is much higher than ever reported values of MgAgSb system. Benefiting from the combination of the optimized average power factor of p‐leg and low interface resistivity, a fabricated eight‐pair MgCu0.1Ag0.87Sb0.99/Mg3.2Bi1.5Sb0.5 module demonstrates an unprecedently high output power density of 2.9 W cm−2 under a temperature difference of 300 K, outperforming all low‐temperature advanced thermoelectric modules. Meanwhile, a competitive conversion efficiency of 7.65% is obtained simultaneously. The work significantly advances high‐power thermoelectric applications of Mg‐based modules in the field of low‐temperature sustainable energy harvesting.

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Thermoelectric MgAgSb alloys for sustainable energy application

Iqbal

Wang

et al. 2022

Intl J of Energy Research

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Summary Solid‐state thermoelectric (TE) devices are known for converting solar energy and waste heat into electricity, which provides a substitute path for energy production and utilization to commence the challenges of energy sustainability. To develop TE devices, it is important to identify thermoelectrically active materials with the potential converting solar energy and heat into electrical energy. In ambient settings, TE devices are one of the most pollution‐free methods of energy conversion since it is noiseless, essentially maintenance‐free, and able to provide electricity continuously for several years. A surge in interest in TE harvesting for diverse uses, including extracting waste heat from automobile exhaust and industrial processes has occurred in recent years. For an efficient TE device, a number of variables must be addressed. These include the availability of TE materials with high ZT, construction of ohmic connections between thermoelements and metallic interconnect, material engineering and defects systems, and the control of maximum heat transport through the device. The current review summarized a recent understanding of a reliable and eco‐friendly strategy for synthesizing pure MgAgSb alloy and its TE performance enhancement. First, a discussion on the various strategies employed to improve ZT and band structure determination is described. Then, we provided an overview of excellent TE performance, applications of bandgap engineering to enhance TE ZT value and their capacity to produce energy, and good quality nanostructured a‐MgAgSb to produce long‐term, thermally stable microstructure. Finally, we will look at how well a single‐leg device converts power. The current mysteries, along with future perspectives and challenges for this material system, are described in the outlook section.

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On the influence of AgMg precursor formation on MgAgSb microstructure and thermoelectric properties

Cited by 9 publications

References 42 publications

Establishing synthesis–composition–property relationships for enhanced and reproducible thermoelectric properties of MgAgSb

Establishing synthesis–composition–property relationships for enhanced and reproducible thermoelectric properties of MgAgSb

Semiconductor–Semimetal Composite Engineering Enabling Record‐High Thermoelectric Power Density for Low‐Temperature Energy Harvesting

Thermoelectric MgAgSb alloys for sustainable energy application

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