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          : A high-performance thermoelectric bulk material with extremely low thermal conductivity

Kurosaki, Ken; Kosuga, Atsuko; Muta, Hiroaki; Uno, Masayoshi; Yamanaka, Shinşuke

doi:10.1063/1.2009828

Cited by 257 publications

(192 citation statements)

References 16 publications

(3 reference statements)

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“…23 Young's modulus is related to the stiffness of a material's individual atomic bonds. 12,36 Weaker interatomic bonding generally results in lower stiffness and a lower Young's modulus. The materials with a low Young's modulus are considered to have 'soft' bonding, which will result in a slow transport of phonons, and thus a lower lattice thermal conductivity.…”

Section: Origin Of the Low Thermal Conductivitymentioning

confidence: 99%

“…where the C v is the molar specific heat at constant volume, l is the mean free path of phonons, and v a is the average sound velocity, which is defined as follows 12,40 :…”

Section: Structural and Thermoelectric Propertiesmentioning

confidence: 99%

“…Alternatively, high-performance single-phase thermoelectric materials can be obtained using materials with intrinsically low lattice thermal conductivities. Typical materials included in this class are as follows: AgSbTe 2 (kB0.39 Wm À1 K À1 , ZTB1.6 at 673 K), 10,11 Ag 9 TlTe 5 (kB0.22 Wm À1 K À1 , ZTB1.2 at 700 K), 12 Ag 0.95 GaTe 2 (kB0.20 Wm À1 K À1 , ZTB0.7 at 850 K), 13 Ag 3.9 Mo 9 Se 11 (kB0.75 Wm À1 K À1 , ZTB0.6 at 800 K), 14 Cu 3 SbSe 4 (kB0.50 Wm À1 K À1 , ZTB0.8 at 650 K), 15 Cu 2 Ga 4 Te 7 (kB0.67 Wm À1 K À1 , ZTB0.6 at 940 K), 16 Cu 2.1 Zn 0.9 SnSe 4 (kB0.50 Wm À1 K À1 , ZTB0.9 at 860 K), 17 Cu 2 Ga 0.07 Ge 0.93 Se 3 (kB0.67 Wm À1 K À1 , ZTB0.5 at 745 K), 18 CsBi 4 Te 6 (kB0.50 Wm À1 K À1 , ZTB0.8 at 275 K), 19 and K 2 Bi 8 Se 13 (kB0.80 Wm À1 K À1 , ZTB0.4 at 400 K). 20 Recently, we reported a quaternary BiCuSeO compound that exhibits very low thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

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High thermoelectric performance of oxyselenides: intrinsically low thermal conductivity of Ca-doped BiCuSeO

et al. 2013

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We report on the high thermoelectric performance of p-type polycrystalline BiCuSeO, a layered oxyselenide composed of alternating conductive (Cu 2 Se 2 ) 2 À and insulating (Bi 2 O 2 ) 2 þ layers. The electrical transport properties of BiCuSeO materials can be significantly improved by substituting Bi 3 þ with Ca 2 þ . The resulting materials exhibit a large positive Seebeck coefficient of B þ 330 lV K À1 at 300 K, which may be due to the 'natural superlattice' layered structure and the moderate effective mass suggested by both electronic density of states and carrier concentration calculations. After doping with Ca, enhanced electrical conductivity coupled with a moderate Seebeck coefficient leads to a power factor of B4.74 lW cm À1 K À2 at 923 K. Moreover, BiCuSeO shows very low thermal conductivity in the temperature range of 300 (B0.9 W m À1 K À1 ) to 923 K (B0.45 W m À1 K À1 ). Such low thermal conductivity values are most likely a result of the weak chemical bonds (Young's modulus, EB76.5 GPa) and the strong anharmonicity of the bonding arrangement (Gruneisen parameter, cB1.5). In addition to increasing the power factor, Ca doping reduces the thermal conductivity of the lattice, as confirmed by both experimental results and Callaway model calculations. The combination of optimized power factor and intrinsically low thermal conductivity results in a high ZT of B0.9 at 923 K for Bi 0.925 Ca 0.075 CuSeO.

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Section: Origin Of the Low Thermal Conductivitymentioning

confidence: 99%

“…where the C v is the molar specific heat at constant volume, l is the mean free path of phonons, and v a is the average sound velocity, which is defined as follows 12,40 :…”

Section: Structural and Thermoelectric Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High thermoelectric performance of oxyselenides: intrinsically low thermal conductivity of Ca-doped BiCuSeO

et al. 2013

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“…The last penta-telluride Ag 9 TlTe 5 has a complex structure. The thermal conductivity of this material is smaller than that of other good TE materials like Bi 2 Te 3 or TAGS [Kurosaki 2005]. Ag 9 TlTe 5 has a ZT of 1.2 at 700K.…”

Section: 2c Penta-hexa-telluridesmentioning

confidence: 99%

Role of Structures on Thermal Conductivity in Thermoelectric Materials

Godart

Gonçalves²,

Lopes³

et al. 2009

NATO Science for Peace and Security Series B: Physics and Biophysics

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“…Most of the extremely low materials that have been reported so far are thallium tellurides, e.g. Ag 9 TlTe 5 ( ¼ 0:22 Wm À1 K À1 ) 7) and Tl 4 SnTe 3 ( ¼ $0:5 Wm À1 K À1 ). 8) Therefore, Tl would play some roles in appearing the extremely low .…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of the Thallium-Tellurium Binary Compounds

et al. 2009

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We are paying attention to extremely low thermal conductivity () materials which have a potential to be next generation thermoelectric materials. Most of the extremely low materials that have been reported so far are ternary thallium tellurides such as Ag-Tl-Te ternary system. However, as for Tl-Te binary system, the thermoelectric properties have been scarcely reported. In the present study, the Tl-Te binary compounds, Tl 2 Te, Tl 5 Te 3 , TlTe, and Tl 2 Te 3 , were prepared and their thermoelectric properties were investigated. The of TlTe was relatively high (approximately 4 Wm À1 K À1 at 300 K), while those of Tl 2 Te and Tl 2 Te 3 were extremely low ($0:5 Wm À1 K À1 at 300 K). These compounds indicated relatively high thermoelectric figure of merit ZT, e.g., Tl 2 Te showed the highest value of 0.2 at 586 K.

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Ag 9 Tl Te 5 : A high-performance thermoelectric bulk material with extremely low thermal conductivity

Abstract: Articles you may be interested inEnhanced thermopower and thermoelectric performance through energy filtering of carriers in (Bi2Te3)0.2(Sb2Te3)0.8 bulk alloy embedded with amorphous SiO2 nanoparticles

Cited by 257 publications

References 16 publications

High thermoelectric performance of oxyselenides: intrinsically low thermal conductivity of Ca-doped BiCuSeO

High thermoelectric performance of oxyselenides: intrinsically low thermal conductivity of Ca-doped BiCuSeO

Role of Structures on Thermal Conductivity in Thermoelectric Materials

Thermoelectric Properties of the Thallium-Tellurium Binary Compounds

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