Chemical aspects of the design of thermoelectric materials

Shevelkov, Аndrei V.

doi:10.1070/rc2008v077n01abeh003746

Cited by 140 publications

(81 citation statements)

References 130 publications

(136 reference statements)

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“…14 Ta-doped SrTiO 3 might also be a good or even better TE material, since Ta doping compared with Nb doping will result in the intensification of the phonon scattering and, correspondingly, the reduction of the lattice thermal conductivity. 15 We have successfully doped Ta into SrTiO 3 samples, and a series of samples have been characterized by powder x-ray diffraction and EPMA.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Cui

Salvador

Yang

et al. 2009

Journal of Elec Materi

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Three Ta-doped strontium titanates were prepared as potential candidates for n-type thermoelectric oxides. The purity of the polycrystalline samples of SrTi 1Àx Ta x O 3 (x = 0.05 to 0.14) were characterized by means of powder x-ray diffraction and electron probe micro analysis (EPMA). We present the results of Seebeck coefficient, electrical conductivity, and thermal conductivity measurements performed at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Cui

Salvador

Yang

et al. 2009

Journal of Elec Materi

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“…These compounds have attracted attention only during the last two decades as a result of the development of the "phonon glass-electron crystal" concept, [2] according to which inorganic clathrates are considered as prospective thermoelectric materials (TMs). [3][4][5] The possibility of varying their thermal and electric transport properties independently arises directly from their structure features, being a necessary condition for an efficient TM. [4][5][6] High thermoelectric efficiency (ZT) has been observed for the clathrates Sr 8 Ge 30 Ga 16 (ZT % 0.25 at T = 300 K) and Ba 8 Ge 30 Ga 16 (ZT > 1 at T > 800 K).…”

Section: Introductionmentioning

confidence: 99%

Semiclathrates of the Ge–P–Te System: Synthesis and Crystal Structures

Kirsanova

Reshetova

Olenev

et al. 2011

Chemistry A European J

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Novel compounds [Ge(46-x) P(x) ]Te(y) (13.9≤x≤15.6, 5.92≤y≤7.75) with clathrate-like structures have been prepared and structurally characterized. They crystallize in the space group Fm ̅3 with the unit cell parameter changing from 20.544(2) to 20.698(2) Å (Z=8) on going from x=13.9 to x=15.6. Their crystal structure is composed of a covalently bonded Ge-P framework that hosts tellurium atoms in the guest positions and can be viewed as a peculiar variant of the type I clathrate superstructure. In contrast to the conventional type I clathrates, [Ge(46-x) P(x) ]Te(y) contain tricoordinated (3b) atoms and no vacancies in the framework positions. As a consequence of the transformation of the framework, the majority of the guest tellurium atoms form a single covalent bond with the host framework and thus the title compounds are the first representative of semiclathrates with covalent bonding. A comparison is made with silicon clathrates and the evolution of the crystal structure upon changing the tellurium content is discussed.

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“…In ideal thermoelectric materials, a high electrical conductivity (s) needs to be combined with a high Seebeck coefficient (S) and a low total thermal conductivity (k). [6,7,8] However, as all of these properties depend on the charge-carrier concentration, they cannot be varied independently. The efficiencies of thermoelectric generators depend on the dimensionless figure of merit, ZT = S 2 sTk…”

Section: Introductionmentioning

confidence: 99%

Elemental Distribution and Thermoelectric Properties of Layered Tellurides 39R‐M_0.067Sb_0.667Te_0.266 (M=Ge, Sn)

Schneider

Fahrnbauer

Rosenthal

et al. 2011

Chemistry A European J

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The isostructural phases 39R‐Ge0.067Sb0.667Te0.266 (R$\bar 3$m, a=4.2649(1), c=75.061(2) Å) and 39R‐Sn0.067Sb0.667Te0.266 (R$\bar 3$m, a=4.2959(1), c=75.392(2) Å) were prepared by quenching stoichiometric melts of the pure elements and subsequent annealing at moderate temperatures. Their structures are comparable to “superlattices” synthesized by layer‐by‐layer deposition onto a substrate. These structures show no stacking disorder by electron microscopy. The structure of the metastable layered phases are similar to that of 39R‐Sb10Te3 (equivalent to Sb0.769Te0.231), which contains four A7 gray‐arsenic‐type layers of antimony alternating with Sb2Te3 slabs. Joint refinements on single‐crystal diffraction data using synchrotron radiation at several K edges were performed to enhance the scattering contrast. These refinements show that the elemental distributions at some atom positions are disordered whereas otherwise the structures are long‐range ordered. The variation of the elemental concentration correlates with the variation in interatomic distance. Z‐contrast scanning transmission electron microscopy (HAADF‐STEM) on 39R‐Ge0.067Sb0.667Te0.266 confirms the presence of concentration gradients. The carrier‐type of the isostructural metal (A7‐type lamellae)‐semiconductor heterostructures (Ge/Sn‐doped Sb2Te3 slabs) varies from n‐type (Ge0.067Sb0.667Te0.266) to p‐type (Sn0.067Sb0.667Te0.266). Although the absolute values of the Seebeck coefficient reached about 50–70 μV/K and the electrical conductivity is relatively high, the two isotypic phases exhibit a maximal thermoelectric figure of merit (ZT) of 0.06 at 400 °C as their thermal conductivity (κ≈8–9.5 W/mK at 400 °C) lies interestingly in between that of antimony and pure Sb2Te3.

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Chemical aspects of the design of thermoelectric materials

Cited by 140 publications

References 130 publications

Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Semiclathrates of the Ge–P–Te System: Synthesis and Crystal Structures

Elemental Distribution and Thermoelectric Properties of Layered Tellurides 39R‐M_0.067Sb_0.667Te_0.266 (M=Ge, Sn)

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Chemical aspects of the design of thermoelectric materials

Cited by 140 publications

References 130 publications

Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Semiclathrates of the Ge–P–Te System: Synthesis and Crystal Structures

Elemental Distribution and Thermoelectric Properties of Layered Tellurides 39R‐M0.067Sb0.667Te0.266 (M=Ge, Sn)

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Elemental Distribution and Thermoelectric Properties of Layered Tellurides 39R‐M_0.067Sb_0.667Te_0.266 (M=Ge, Sn)