Electronic properties of liquid MgSb

Verbrugge, Dawn M; Zytveld, J B Van

doi:10.1016/0022-3093(93)90058-6

Cited by 21 publications

(13 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mg 3 Sb 2 is an indirect semiconductor with the calculated bandgap E g ranging from 0.4 to 0.7 eV based on different calculation methods [ 70 , 71 , 110 , 116 , 126 , 127 ], while Mg 3 Bi 2 is predicted to be a topological nodal line semimetal with the coexistence of electron and hole pockets near Fermi level E F [ 128 – 130 ]. Experimentally, an E g of about 0.18 eV was estimated from the resistivity below 390 K for undoped Mg 3 Sb 2 [ 131 ], while a much larger value of about 0.8 eV was reported by estimating the gap of the liquid phase of Mg 3 Sb 2 [ 132 ]. A similar E g of 0.8 eV was also reported in the 1950s [ 63 ].…”

Section: Chemical Bonding and Structurementioning

confidence: 99%

High-Performance Mg ₃ Sb _{2-
x} Bi _x Thermoelectrics: Progress and Perspective

Zhao

et al. 2020

Research

View full text Add to dashboard Cite

Since the first successful implementation of n-type doping, low-cost Mg3Sb2-xBix alloys have been rapidly developed as excellent thermoelectric materials in recent years. An average figure of merit zT above unity over the temperature range 300–700 K makes this new system become a promising alternative to the commercially used n-type Bi2Te3-xSex alloys for either refrigeration or low-grade heat power generation near room temperature. In this review, with the structure-property-application relationship as the mainline, we first discuss how the crystallographic, electronic, and phononic structures lay the foundation of the high thermoelectric performance. Then, optimization strategies, including the physical aspects of band engineering with Sb/Bi alloying and carrier scattering mechanism with grain boundary modification and the chemical aspects of Mg defects and aliovalent doping, are extensively reviewed. Mainstream directions targeting the improvement of zT near room temperature are outlined. Finally, device applications and related engineering issues are discussed. We hope this review could help to promote the understanding and future developments of low-cost Mg3Sb2-xBix alloys for practical thermoelectric applications.

show abstract

Section: Chemical Bonding and Structurementioning

confidence: 99%

High-Performance Mg ₃ Sb _{2-
x} Bi _x Thermoelectrics: Progress and Perspective

Zhao

et al. 2020

Research

View full text Add to dashboard Cite

show abstract

“…Mg 3 Sb 2 can have homogeneous native vacancy either on A (Mg) site or on C (Sb) site, depending on its stoichiometry . Deficiency of Mg promotes the formation of Mg vacancies while excess of Mg leads to the formation of Mg interstitials .…”

Section: Defects and The Influence On Charge Transportmentioning

confidence: 99%

Advances in Thermoelectric Mg₃Sb₂ and Its Derivatives

Shi

Wang

et al. 2018

Small Methods

View full text Add to dashboard Cite

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...

show abstract

“…However, most of Zintl phase materials are made of expensive rare earth elements and/or toxic elements, resulting in limitation for their application in power generation and refrigeration. The Zintl phase Mg 3 Sb 2 , which involves non-toxic, cheap and abundant elements, has also been investigated in hopes of achieving a high ZT for intermediate or high temperature applications [34,35]. The Mg 3 Sb 2 phase, crystallizing in the same P-3m1 space group as the inverse a-La 2 O 3 structure type, exhibits a characteristic feature of PGEC for a potentially high figure of merit [36].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of Na-doped Zintl compound: Mg3−Na Sb2

et al. 2015

View full text Add to dashboard Cite

Mg 3Àx Na x Sb 2 has been prepared successfully by mechanical alloying plus hot pressing to investigate the effects of Na doping on the thermoelectric properties. Thermoelectric properties were characterized by the Seebeck coefficient, electrical resistivity, thermal conductivity, and thermoelectric figure of merit (ZT) from 298 to 773 K. Transport measurements reveal that an optimum doping of 1.25 at.% Na on Mg achieved ZT of 0.6 at 773 K. The enhancement in ZT is attributed to increased carrier concentration and power factor. The low cost, abundance, and nontoxicity makes this material a potentially promising thermoelectric material for power generation at a heat source below 773 K.

show abstract

Electronic properties of liquid MgSb

Cited by 21 publications

References 8 publications

High-Performance Mg ₃ Sb _{2-
x} Bi _x Thermoelectrics: Progress and Perspective

High-Performance Mg ₃ Sb _{2-
x} Bi _x Thermoelectrics: Progress and Perspective

Advances in Thermoelectric Mg₃Sb₂ and Its Derivatives

Thermoelectric properties of Na-doped Zintl compound: Mg3−Na Sb2

Contact Info

Product

Resources

About

Electronic properties of liquid MgSb

Cited by 21 publications

References 8 publications

High-Performance Mg 3 Sb 2- x Bi x Thermoelectrics: Progress and Perspective

High-Performance Mg 3 Sb 2- x Bi x Thermoelectrics: Progress and Perspective

Advances in Thermoelectric Mg3Sb2 and Its Derivatives

Thermoelectric properties of Na-doped Zintl compound: Mg3−Na Sb2

Contact Info

Product

Resources

About

High-Performance Mg ₃ Sb _{2-
x} Bi _x Thermoelectrics: Progress and Perspective

High-Performance Mg ₃ Sb _{2-
x} Bi _x Thermoelectrics: Progress and Perspective

Advances in Thermoelectric Mg₃Sb₂ and Its Derivatives