Reduced phase space of heat-carrying acoustic phonons in single-crystalline InTe

Misra, Shantanu; Barreteau, Céline; Crivello, Jean-Claude; Giordano, Valentina M.; Castellan, J. P.; Sidis, Y.; Levinský, Petr; Malaman, B.; Dauscher, A.; Lenoir, Bertrand; Candolfi, Christophe; Pailhés, S.

doi:10.1103/physrevresearch.2.043371

Cited by 28 publications

(40 citation statements)

References 80 publications

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“…Besides, the maxima centered below 10 K in the relationship of T ~ C p / T 3 have also been observed in (PbSe) 5 (Bi 2 Se 3 ) 3m . These features have also been reported in compounds with low thermal conductivities, such as BaGa 5 and InTe 53 , 54 . The low-lying optical phonons couple with heat-carrying acoustic phonons, decreasing group velocities and thereby restraining heat transport.…”

Section: Resultssupporting

confidence: 58%

High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity

Fang

Qin

et al. 2021

Nat Commun

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Thermoelectrics enable waste heat recovery, holding promises in relieving energy and environmental crisis. Lillianite materials have been long-term ignored due to low thermoelectric efficiency. Herein we report the discovery of superior thermoelectric performance in Pb7Bi4Se13 based lillianites, with a peak figure of merit, zT of 1.35 at 800 K and a high average zT of 0.92 (450–800 K). A unique quality factor is established to predict and evaluate thermoelectric performances. It considers both band nonparabolicity and band gaps, commonly negligible in conventional quality factors. Such appealing performance is attributed to the convergence of effectively nested conduction bands, providing a high number of valley degeneracy, and a low thermal conductivity, stemming from large lattice anharmonicity, low-frequency localized Einstein modes and the coexistence of high-density moiré fringes and nanoscale defects. This work rekindles the vision that Pb7Bi4Se13 based lillianites are promising candidates for highly efficient thermoelectric energy conversion.

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Section: Resultssupporting

confidence: 58%

High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity

Fang

Qin

et al. 2021

Nat Commun

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“…In addition, the manifold of low-energy optical modes in the vibrational spectrum (Figure 7) provides a large momentum-and energy-conserving phase space for threephonon Umklapp scattering involving the acoustic modes. [39][40][41][42][43][44][45][46] These scattering events are thus more easily achieved at low temperatures, further explaining the absence of Umklapp peak in this sample. These results confirm the critical role of partial cationic ordering in limiting the heat transport at low temperatures.…”

Section: Low Temperature Transport Propertiesmentioning

confidence: 92%

Local-Disorder-Induced Low Thermal Conductivity in Degenerate Semiconductor Cu₂₂Sn₁₀S₃₂

et al. 2021

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Sulphur-based semiconductors are attracting attention as environmentally-friendly materials for energy-conversion applications due to their structural complexity and semiconducting properties.Here, we show that the delicate interplay between chemical composition and cationic order/disorder allows to stabilize a new sphalerite derivative phase of cubic symmetry in the Cu-Sn-S diagram: Cu22Sn10S32. Interestingly, its crystal structure is characterized by a semi-ordered cationic distribution, the Cu-Sn disorder being localized on one crystallographic site in a longrange ordered matrix. The origin of the partial disorder as well as its influence on the electronic and thermal transport properties are addressed in detail using a combination of synchrotron diffraction, Mössbauer spectroscopy, transmission electron microscopy, theoretical modelling, and transport properties measurements. These measurements evidence that this compound behaves as a pseudo-gap, degenerate p-type material with very low lattice thermal conductivity (0.5 W m -1 K -1 at 700 K). We show that localized disorder is very effective in lowering 𝜅 ! without compromising the integrity of the conductive framework. Substituting pentavalent Sb for tetravalent Sn is further exploited to lower the hole concentration and doubles the thermoelectric figure of merit ZT to 0.55 at 700 K with respect to the pristine compound. The discovery of this semi-ordered cubic sphalerite derivative Cu22Sn10S32 furthers our understanding of the structureproperties relationships in the Cu-Sn-S system and more generally in ternary and quaternary copper-based systems.

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“…Theoretically, these deviations have been shown to be a signature of strong intrinsic anharmonicity resulting in pronounced renormalization effects on the phonon frequencies of optical modes that shape the low-energy part of the phonon spectrum of these materials. [61][62][63][64][65][66][67][68][69][70][71][72][73] These similarities suggest that CuPbBi5S9 may also show an anharmonic behavior. At high temperatures, L approaches the minimum lattice thermal conductivity min of 0.26 W m -1 K -1 , calculated from the measured room-temperature longitudinal (vl = 3074 m s -1 ) and transverse (vt = 1565 m s -1 ) sound velocities according to the model of Cahill and Pohl, 74 indicating a near-minimum phonon mean free path.…”

Section: Thermal Transport Propertiesmentioning

confidence: 99%

A Tunable Structural Family with Ultralow Thermal Conductivity: Copper-Deficient Cu_1–x□_xPb_1–xBi_1+xS₃

et al. 2022

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Reduced phase space of heat-carrying acoustic phonons in single-crystalline InTe

Cited by 28 publications

References 80 publications

High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity

High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity

Local-Disorder-Induced Low Thermal Conductivity in Degenerate Semiconductor Cu₂₂Sn₁₀S₃₂

A Tunable Structural Family with Ultralow Thermal Conductivity: Copper-Deficient Cu_1–x□_xPb_1–xBi_1+xS₃

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Reduced phase space of heat-carrying acoustic phonons in single-crystalline InTe

Cited by 28 publications

References 80 publications

High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity

High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity

Local-Disorder-Induced Low Thermal Conductivity in Degenerate Semiconductor Cu22Sn10S32

A Tunable Structural Family with Ultralow Thermal Conductivity: Copper-Deficient Cu1–x□xPb1–xBi1+xS3

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Product

Resources

About

Local-Disorder-Induced Low Thermal Conductivity in Degenerate Semiconductor Cu₂₂Sn₁₀S₃₂

A Tunable Structural Family with Ultralow Thermal Conductivity: Copper-Deficient Cu_1–x□_xPb_1–xBi_1+xS₃