Reinvestigation of the thermoelectric properties of Ag<sub>8</sub>GeTe<sub>6</sub>

Charoenphakdee, Anek; Kurosaki, Ken; Muta, Hiroaki; Uno, Masayoshi; Yamanaka, Shinşuke

doi:10.1002/pssr.200701302

Cited by 45 publications

(30 citation statements)

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“…20 Guided by the PLEC concept, low k L values between 0.3 and 0.6 W m À1 K À1 and high ZT values between 1.0 and 2.1 have been observed in many superionic semiconductors, such as Cu 2Àd X (X = S, Se, Te), 18,19,21,22 CuAgSe, 23 CuCrSe 2 , 24,25 and argyrodite-type compounds. [26][27][28][29][30][31] Among them, argyroditetype compounds have a general formula A (12Àn)/m m+ B n+ X 6 2À , in which m and n are the valence states of A-cations (Li + , Cu + , Ag + ) and B-cations (Ga 3+ , Si 4+ , Ge 4+ , Sn 4+ , P 5+ , As 5+ ), respectively, and X = S, Se or Te. 32 The crystal structures of argyrodite-type compounds at room temperature may be monoclinic, orthorhombic, hexagonal, or cubic, depending on the component elements.…”

Section: Introductionmentioning

confidence: 99%

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Cu₈GeSe₆-based thermoelectric materials with an argyrodite structure

et al. 2017

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Section: Introductionmentioning

confidence: 99%

“…34 The TE properties of argyrodite-type compounds have been measured very recently. 27 35 and Ag 8 SnSe 6 . 26,30,31 These exciting results suggest that argyroditetype materials are a new family of TE compounds.…”

Section: Introductionmentioning

confidence: 99%

Cu₈GeSe₆-based thermoelectric materials with an argyrodite structure

et al. 2017

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“…Recently, a class of “liquid‐like” TE materials with complex phase transitions, ultralow lattice thermal conductivity, and liquid‐like ionic conduction have been reported, Cu 2− x (S, Se, Te), [ 19–21 ] Ag 2 (S, Se, Te), [ 22,23 ] argyrodite, [ 24–36 ] AgCrSe 2 , [ 37,38 ] CuAgSe, [ 39 ] and AgCuTe [ 40 ] to name a few. Argyrodites are good examples of liquid‐like TE materials.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the high‐temperature TE properties of argyrodites, most prior studies are focused on selenides and tellurides, leaving sulfides conspicuously less heeded ( Figure ). [ 24–36 ] It is therefore imperative to study high‐temperature TE properties of sulfides argyrodites to fill this knowledge gap toward a holistic comprehension of the rich materials physics and materials chemistry behaviors of 816 phase argyrodites. Generally speaking, a material with high crystal lattice symmetry possess high band degeneracy and large density of states effective mass

m_{d}^{*}

m_{d}^{*} = N_{V}^{2 / 3} m_{b}^{*}

, where N V refers to both orbital and symmetry related degeneracy and

m_{b}^{*}

is the band effective mass.…”

Section: Introductionmentioning

confidence: 99%

High Thermoelectric Performance in Sulfide‐Type Argyrodites Compound Ag₈Sn(S₁₋_xSe_x)₆ Enabled by Ultralow Lattice Thermal Conductivity and Extended Cubic Phase Regime

Shen

Xia

Yang

et al. 2020

Adv Funct Materials

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Argyrodites with a general chemical formula of A 8 BC 6 are known for complex phase transitions, ultralow lattice thermal conductivity, and mixed electronic and ionic conduction. The coexistence of ionic conduction and promising thermoelectric performance have recently been reported in selenide and telluride argyrodites, but scarcely in sulfide argyrodites. Here, the thermoelectric properties of Ag 8 Sn(S 1−x Se x ) 6 are reported. Specifically, Ag 8 SnS 6 exhibits intrinsically ultralow lattice thermal conductivities of 0.61-0.31 W m −1 K −1 over the whole temperature range from 32 to 773 K due to distorted local crystal structure, relatively weak chemical bonding, rattler-like Ag atoms, low-lying optical modes, and dynamic disorder of Ag ions at high temperatures. Se doping shifts the orthorhombic-cubic phase transition from 457 K at x = 0 to 430 K at x = 0.10, thereby expanding the temperature range of the thermoelectrically favored cubic phase. A figure of merit zT value ≈ 0.80 is achieved at 773 K in Ag 8 Sn(S 1−x Se x ) 6 (x = 0.03), the highest zT value reported in sulfide argyrodites. These results fill a knowledge gap of the thermoelectric study of argyrodites and contribute to a comprehensive understanding of the chemical bonding, lattice dynamics, and thermal transport of argyrodites.a potential for practical applications. Yet, it is still a challenge to decouple the adversely correlated {σ, S, κ e } toward high zT values via electronic and phonon band engineering. [3][4][5][6][7][8] Many efforts have been devoted to discover novel TE materials such as cage-like filled skutterudites (e.g., CeFe 4 Sb 12 , CoSb 3 , Sr 8 Ga 16 Ge 30 , etc.), [9][10][11][12] Zintl-phase compounds (e.g., CaZn 2 Sb 2 , Mg 3 Sb 2 , YbMg 2 Bi 2 , etc.), [13][14][15][16] and defective half-Heusler compounds (e.g., Nb 0.8 CoSb, Ti 0.9 NiSb, V 0.9 CoSb, etc.) [17] that possess a long-range order favoring charge carrier mobility while disordered in short range to inhibit heat-carrying phonons in the context of "phonon-glass-electron-crystal". [18] Recently, a class of "liquid-like" TE materials with complex phase transitions, ultralow lattice thermal conductivity, and liquidlike ionic conduction have been reported, Cu 2−x (S, Se, Te), [19][20][21] Ag 2 (S, Se, Te), [22,23] argyrodite, [24][25][26][27][28][29][30][31][32][33][34][35][36] AgCrSe 2 , [37,38] CuAgSe, [39] and AgCuTe [40] to name a few. Argyrodites are good examples of liquid-like TE materials. Argyrodites include 716, 816, and 916 phases in chemistry, with a general chemical formula A 12−n

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“…Many of these compounds and related phases possess semiconducting, photoelectric, and thermoelectric properties [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Phase equilibria in the pseudoternary system Ag2Se-Ag8GeSe6-Ag8SnSe6

et al. 2014

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Phase equilibria in the Ag 2 Se-Ag 8 GeSe 6 -Ag 8 SnSe 6 system have been studied by differen tial thermal analysis, X ray diffraction, scanning electron microscopy, and emf measurements on con centration cells with Ag 4 RbI 5 as a solid electrolyte. We have mapped out the T-x phase diagram of the constituent binary system Ag 8 GeSe 6 -Ag 8 SnSe 6 , those of two mutually perpendicular sections, and the liquidus projection. The two crystalline phases of the constituent selenides Ag 8 GeSe 6 and Ag 8 SnSe 6 have been shown to form a continuous series of solid solutions. The Ag 2 Se-Ag 8 GeSe 6 -Ag 8 SnSe 6 system is a pseudoternary section through the quaternary system Ag-Ge-Sn-Se, and its phase diagram has a univariant eutectic.

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Reinvestigation of the thermoelectric properties of Ag₈GeTe₆

Cited by 45 publications

References 5 publications

Cu₈GeSe₆-based thermoelectric materials with an argyrodite structure

Cu₈GeSe₆-based thermoelectric materials with an argyrodite structure

High Thermoelectric Performance in Sulfide‐Type Argyrodites Compound Ag₈Sn(S₁₋_xSe_x)₆ Enabled by Ultralow Lattice Thermal Conductivity and Extended Cubic Phase Regime

Phase equilibria in the pseudoternary system Ag2Se-Ag8GeSe6-Ag8SnSe6

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Reinvestigation of the thermoelectric properties of Ag8GeTe6

Cited by 45 publications

References 5 publications

Cu8GeSe6-based thermoelectric materials with an argyrodite structure

Cu8GeSe6-based thermoelectric materials with an argyrodite structure

High Thermoelectric Performance in Sulfide‐Type Argyrodites Compound Ag8Sn(S1−xSex)6 Enabled by Ultralow Lattice Thermal Conductivity and Extended Cubic Phase Regime

Phase equilibria in the pseudoternary system Ag2Se-Ag8GeSe6-Ag8SnSe6

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Reinvestigation of the thermoelectric properties of Ag₈GeTe₆

Cu₈GeSe₆-based thermoelectric materials with an argyrodite structure

Cu₈GeSe₆-based thermoelectric materials with an argyrodite structure

High Thermoelectric Performance in Sulfide‐Type Argyrodites Compound Ag₈Sn(S₁₋_xSe_x)₆ Enabled by Ultralow Lattice Thermal Conductivity and Extended Cubic Phase Regime