Experimental Study of the Al-Mg-Sr Phase Diagram at 400°C

Kevorkov, Dmytro; Medraj, Mamoun; Aljarrah, M.; Li, Jian; Essadiqi, E.; Chartrand, Patrice; Fuerst, C. D.

doi:10.1155/2014/690623

Cited by 3 publications

(1 citation statement)

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“…The promising thermoelectric performance realized in these compounds is enabled by the richness in composition for further manipulation of both electronic and thermal properties as well as by the intrinsic low lattice thermal conductivity. The general formula for this class of Zintl compounds can be written as AB 2 C 2 , where A can be alkaline earth or rare‐earth elements (e.g., Mg, Ca, Sr, Ba, Eu, Yb), B can be transition metals or main‐group elements (e.g., Cd, Zn, Mg, Mn, Al), and C can be Group IV/V elements (e.g., Sb, Bi). Such a broad variety in composition enables either a very low lattice thermal conductivity or a very high band degeneracy, as well as great availabilities for further manipulating the phonon and charge transport properties through the formation of solid solution .…”

Section: Introductionmentioning

confidence: 99%

Advances in Thermoelectric Mg₃Sb₂ and Its Derivatives

Shi

Wang

et al. 2018

Small Methods

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approaching their minimum, therefore fundamentally limits the availability for further improvements in these materials by this thermal strategy.This inspires the development of electronic strategies for zT enhancements in recent years. The strong coupling effect among S, σ, and κ e has led early strategies for electronic performance enhancement to mainly rely on the carrier concentration (n H ) optimization through chemical doping for nearly the past half of a century. [7] Till very recently, proven electronic strategies have been typified by engineering the band structure to increase the band degeneracy through band convergence [8] or nestification, [9] to decrease the band effective mass [10] and to introduce resonant states. [11] These approaches successfully decouple the strong correlation among electronic transport properties to some extent, enabling effective improvements in electronic performance for enhancing zT.The utilization of the above thermal and electronic strategies has led to a significant advancement mostly in conventional thermoelectrics such as PbTe [7,[12][13][14][15][16] and Bi 2 Te 3 , [17][18][19][20] while the toxicity and the scarcity of the constituent element are important issues limiting their large-scale application. Zintl compounds, which by strict definition requires to be valence balanced and semiconducting, [21] have shown excellent zT at high temperatures. [21][22][23][24] A recently developed class of Zintl compounds [25] having CaAl 2 Si 2 -type structure, Mg 3 Sb 2 , and its derivatives, demonstrates a great potential to address the toxicity and the scarcity issues and therefore attracts increasing number of researchers to focus on these materials. [26] The promising thermoelectric performance realized in these compounds is enabled by the richness in composition for further manipulation of both electronic and thermal properties as well as by the intrinsic low lattice thermal conductivity. The general formula for this class of Zintl compounds can be written as AB 2 C 2 , where A can be alkaline earth or rare-earth elements (e.g., Mg, [27][28][29] Ca, [30] Sr, [31,32] Ba, [33] Eu, [34] Yb [30] ), B can be transition metals or main-group elements (e.g., Cd, [35,36] Zn, [37] Mg, [38,39] Mn, [40] Al [41] ), and C can be Group IV/V elements (e.g., Sb, [29] Bi [42] ). Such a broad variety in composition enables either a very low lattice thermal conductivity [43][44][45][46] or a very high band degeneracy, [22,44,45] as well as great availabilities for further manipulating the phonon and charge transport properties through the formation of solid solution. [27,47] In this review, Mg 3 Sb 2 and its derivative (AB 2 C 2 ) compounds with demonstrated high thermoelectric performances are focused on. The origins leading to such a high performance are summarized Over the past couple of decades, thermoelectric Mg 3 Sb 2 and its derivatives have attracted increasing attention for thermoelectric applications. This is enabled by the richness in composition for manipulating both electronic and t...

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