Extremely low thermal conductivity of AgTlTe

Kurosaki, Ken; Uneda, Hironori; Muta, Hiroaki; Yamanaka, Shinşuke

doi:10.1016/j.jallcom.2004.11.035

Cited by 18 publications

(9 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Clearly, the crystal structure is key for the lattice dynamics and phonon transport properties. Tl-based materials with ultralow κ l recently have been put forward as promising candidates for room temperature thermoelectric power generation. − For example, TlInTe 2 features κ l = 0.5 W/mK due to rattling of Tl atoms inside Te cages . On the other hand, κ l = 0.3 W/mK of Tl 3 VSe 4 originates from Tl 6s 2 lone pairs, which lead to strong lattice anharmonicity, and loose bonding of the heavy Tl atoms, which reduces the group velocities of the acoustic phonon modes…”

Section: Introductionmentioning

confidence: 99%

Multivalley Band Structure and Phonon-Glass Behavior of TlAgTe

Shafique

Sharma

Sajjad

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

We show that the extraordinary crystal structure of TlAgTe results in a phonon-glass electron-crystal behavior. The material's electronic transport properties are evaluated by first-principles calculations and Boltzmann transport theory. We find a multivalley conduction band (ndoping) and low dispersion at the valence band edge (p-doping), which results in a high power factor. Since the mean free path of a large number of phonon modes is found to fall below the Ioffe−Regel limit, semiclassical Boltzmann transport theory cannot describe the phonon transport, but a twochannel model must be applied. The lattice thermal conductivity turns out to be as low as 0.43 W m −1 K −1 because of strong lattice anharmonicity (originating from Tl 6s 2 lone pairs) and low group velocities (originating from loose bonding of the Tl atoms), which renders TlAgTe to be a highly promising thermoelectric material.

show abstract

Section: Introductionmentioning

confidence: 99%

Multivalley Band Structure and Phonon-Glass Behavior of TlAgTe

Shafique

Sharma

Sajjad

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…The thermoelectric properties − of several binary, ternary, and quaternary copper and silver tellurides have been examined for several years, including Cu 2−δ Te, α- and β-Ag 2 Te, BaCu 2 Te 2 , A 2 BaCu 8 Te 10 (A = K, Rb, Cs), Ag 8 GeTe 6 , AgTlTe, AgSbTe 2 , Ag 3−δ Sb 1+δ Te 4 , (AgBiTe 2 ) 1−δ (Ag 2 Te) δ , (AgSbTe 2 ) 1−δ (GeTe) δ (TAGS), , and AgPb m SbTe 2+ m . In recent years, we have been exploring the properties of a number of ternary Cu/Ag tellurides, that is, Ba 3 Cu 14 Te 12 , Ba 7 M 2 Te 14 , and BaM 2 Te 2 (M = Cu, Ag, or Au) with various bonding M−M interactions and band gaps ranging from 0.5 to 1.0 eV.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural and Physical Properties of New Semiconducting Quaternary Tellurides: Ba₄Ag_3.95Ge₂Te₉and Ba₄Cu_3.71Ge₂Te₉

Cui

Assoud²,

Kleinke³

2009

Inorg. Chem.

View full text Add to dashboard Cite

Two quaternary tellurides, Ba(4)Ag(3.95)Ge(2)Te(9) and Ba(4)Cu(3.71)Ge(2)Te(9), were prepared in evacuated silica tubes at 750 degrees C. Both tellurides crystallize in space group Pbam, with lattice parameters of a = 8.6835(3) A, b = 13.6421(4) A, c = 10.2612(3) A, and V = 1215.55(7) A(3) (Z = 2) for Ba(4)Ag(3.95)Ge(2)Te(9) and a = 8.6464(2) A, b = 13.5305(4) A, c = 10.0810(3) A, and V = 1179.38(6) A(3) (Z = 2) for Ba(4)Cu(3.71)Ge(2)Te(9). These structures are comprised of planar Ag(4)/Cu(4) clusters and dimeric Ge(2)Te(6) units, which are interconnected through Te atoms into a three-dimensional structure. Several split sites in the case of Ba(4)Cu(3.71)Ge(2)Te(9) are reflected in additional, different clusters, including a linear Cu(3) unit. The covalent Ag-Te/Ge-Te network surrounds a one-dimensional linear channel running along the c direction, encompassing the Ba atoms. Electronic structure calculations and transport property measurements show that these two compounds are p-type semiconductors with calculated band gaps of 0.24 eV for the Ag compound and 1.0 eV for the Cu compound.

show abstract

“…We are exploring thallium compounds [3][4][5] to discover a bulk material with advanced thermoelectric performance because they indicate very low values of thermal conductivity. For instance, the thermoelectric properties of some thallium compounds, such as Tl 2 SnTe 5 , Tl 9 BiTe 6 and thallium filled skutterudite (Tl 0:22 Co 4 Sb 12 ) have been already reported.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric and Thermophysical Characteristics of Cu<SUB>2</SUB>Te-Tl<SUB>2</SUB>Te Pseudo Binary System

et al. 2006

Self Cite

View full text Add to dashboard Cite

We studied the thermoelectric and thermophysical properties of Cu 2 Te-Tl 2 Te pseudo binary system. Polycrystalline samples of CuTl 9 Te 5 , Cu 2 Te and Tl 2 Te were prepared and characterized. All samples indicated positive values of the Seebeck coefficient and very low values of the thermal conductivity. The values of the thermal conductivity of CuTl 9 Te 5 and Tl 2 Te at room temperature were 0.49 and 0.35 Wm À1 K À1 , respectively. These very low thermal conductivity values could be associated with the material's thermophysical properties such as the average sound velocity. CuTl 9 Te 5 was found to show relatively high thermoelectric figure of merit ZT; the maximum ZT value was 0.38 obtained at 592 K.

show abstract

Extremely low thermal conductivity of AgTlTe

Cited by 18 publications

References 15 publications

Multivalley Band Structure and Phonon-Glass Behavior of TlAgTe

Multivalley Band Structure and Phonon-Glass Behavior of TlAgTe

Synthesis and Structural and Physical Properties of New Semiconducting Quaternary Tellurides: Ba₄Ag_3.95Ge₂Te₉and Ba₄Cu_3.71Ge₂Te₉

Thermoelectric and Thermophysical Characteristics of Cu<SUB>2</SUB>Te-Tl<SUB>2</SUB>Te Pseudo Binary System

Contact Info

Product

Resources

About

Extremely low thermal conductivity of AgTlTe

Cited by 18 publications

References 15 publications

Multivalley Band Structure and Phonon-Glass Behavior of TlAgTe

Multivalley Band Structure and Phonon-Glass Behavior of TlAgTe

Synthesis and Structural and Physical Properties of New Semiconducting Quaternary Tellurides: Ba4Ag3.95Ge2Te9and Ba4Cu3.71Ge2Te9

Thermoelectric and Thermophysical Characteristics of Cu<SUB>2</SUB>Te-Tl<SUB>2</SUB>Te Pseudo Binary System

Contact Info

Product

Resources

About

Synthesis and Structural and Physical Properties of New Semiconducting Quaternary Tellurides: Ba₄Ag_3.95Ge₂Te₉and Ba₄Cu_3.71Ge₂Te₉