Thermoelectric properties of Mg3Sb2−xBixsingle crystals grown by Bridgman method

Kim, Soo Hyun; Kim, Chung Man; Hong, Yang; Sim, Kyung Ik; Kim, Jae-Hoon; Onimaru, Takahiro; Takabatake, Toshiro; Jung, Myung Hun

doi:10.1088/2053-1591/2/5/055903

Cited by 33 publications

(25 citation statements)

References 21 publications

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“…5), which is claimed to be in fair agreement with optical transmission measurement of 0.96 eV. 6 Defect formation energies, and therefore, free carrier concentrations are sensitive to the band gap. Mg 3 Sb 2 is an indirect, small band gap semiconductor.…”

Section: Band Gap Is Overestimatedsupporting

confidence: 73%

Let’s Uncomplicate: Mg Complexes in Mg3Sb2

Gorai¹,

Stevanović²

2019

Preprint

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Section: Band Gap Is Overestimatedsupporting

confidence: 73%

Let’s Uncomplicate: Mg Complexes in Mg3Sb2

Gorai¹,

Stevanović²

2019

Preprint

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“…In addition, the average band mass ( m * b = 0.24 m e , estimated from m * = 0.5 m e , Figure b) is found to be small in EuZn 2 Sb 2 as well, which leads the hole mobility to be as high as 200 cm 2 V −1 s −1 at room temperature (Figure d) . It should be noted that single‐crystalline Mg 3 Sb 2 and its derivatives may show an even higher mobility . Due to the low valence band degeneracy ( N V = 1), p‐type Mg 3 Sb 2 shows a significantly lower power factor than that of n‐type …”

Section: Band Structure and Band Engineeringmentioning

confidence: 94%

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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“…In a previous work by Kim et al, Mg3Sb2-xBix single crystals were grown by using the Bridgman method and the electrical and thermal transport properties below room temperature were reported. [39] Surprisingly, they reported a huge anisotropy in room temperature electrical resistivity ρ of Mg3Bi2 single crystal with the out-of-plane ρ 100 times larger than the in-plane ρ. [39] The in-plane room temperature carrier mobility of Mg3Bi2 single crystal was reported to be only about 1 cm 2 V -1 s -1 .…”

Section: Introductionmentioning

confidence: 99%

“…[39] Surprisingly, they reported a huge anisotropy in room temperature electrical resistivity ρ of Mg3Bi2 single crystal with the out-of-plane ρ 100 times larger than the in-plane ρ. [39] The in-plane room temperature carrier mobility of Mg3Bi2 single crystal was reported to be only about 1 cm 2 V -1 s -1 . [39] As Mg3Bi2 was predicted to be a semimetal, such low carrier mobility in its single crystalline form is unexpected.…”

Section: Introductionmentioning

confidence: 99%

“…[39] The in-plane room temperature carrier mobility of Mg3Bi2 single crystal was reported to be only about 1 cm 2 V -1 s -1 . [39] As Mg3Bi2 was predicted to be a semimetal, such low carrier mobility in its single crystalline form is unexpected. [30,40] These contradicting findings also motivate us to reinvestigate the intrinsic transport properties of Mg3Sb2 and Mg3Bi2 single crystals.…”

Section: Introductionmentioning

confidence: 99%

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Growth and transport properties of Mg3X2 (X = Sb, Bi) single crystals

Xin

Auffermann

et al. 2018

Materials Today Physics

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The discovery of high thermoelectric performance in n-type polycrystalline Mg3(Sb,Bi)2 based Zintl compounds has ignited intensive research interest. However, some fundamental questions concerning the anisotropic transport properties and the origin of intrinsically low thermal conductivity are still elusive, requiring the investigation of single crystals. In this work, high-quality p-type Mg3Sb2 and Mg3Bi2 single crystals have been grown by using a self-flux method. The electrical resistivity ρ of Mg3Bi2 single crystal displays an anisotropy with ρ in-plane twice larger than out-of-plane. The low-temperature heat capacity and lattice thermal conductivity of Mg3Sb2 and Mg3Bi2 single crystals have been investigated by using the Debye-Callaway model, from which the existence of low-lying vibration mode could be concluded. Large Grüneisen parameters and strong anharmonicity are found responsible for the intrinsically low thermal conductivity. Moreover, grain boundary scattering does not contribute significantly to suppress the lattice thermal conductivity of polycrystalline Mg3Sb2. Our results provide insights into the intrinsic transport 2 properties of Mg3X2 and could pave a way to realize enhanced thermoelectric performance in single-crystalline Mg3X2-based Zintl compounds.

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Thermoelectric properties of Mg₃Sb_2−xBi_xsingle crystals grown by Bridgman method

Cited by 33 publications

References 21 publications

Let’s Uncomplicate: Mg Complexes in Mg3Sb2

Let’s Uncomplicate: Mg Complexes in Mg3Sb2

Advances in Thermoelectric Mg₃Sb₂ and Its Derivatives

Growth and transport properties of Mg3X2 (X = Sb, Bi) single crystals

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Thermoelectric properties of Mg3Sb2−xBixsingle crystals grown by Bridgman method

Cited by 33 publications

References 21 publications

Let’s Uncomplicate: Mg Complexes in Mg3Sb2

Let’s Uncomplicate: Mg Complexes in Mg3Sb2

Advances in Thermoelectric Mg3Sb2 and Its Derivatives

Growth and transport properties of Mg3X2 (X = Sb, Bi) single crystals

Contact Info

Product

Resources

About

Thermoelectric properties of Mg₃Sb_2−xBi_xsingle crystals grown by Bridgman method

Advances in Thermoelectric Mg₃Sb₂ and Its Derivatives