Thermoelectric properties of Bi2O2Se

Ruleova, P.; Drašar, Č.; Lošťák, P.; Li, Chang; Ballıkaya, Sedat; Uher, Ctirad

doi:10.1016/j.matchemphys.2009.08.067

Cited by 190 publications

(119 citation statements)

References 11 publications

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“…5). Extrapolation of the thermal conductivity to 665 K leads to an estimated value of ZT $ 0.2 which is markedly higher than that of Bi 2 O 2 Se at the same temperature (ZT $ 0.1) [12]. Given that the values reported here have been obtained for an undoped material, there should be considerable scope for the improvement of ZT through doping to increase the charge carrier concentration.…”

Section: Electrical and Thermal Transport Propertiesmentioning

confidence: 71%

“…The lattice contribution is predominant, whilst the electronic contribution is only 0.6% of κ tot at room temperature and increases to 8.5% at 573 K. When compared with Bi 2 O 2 Se, which exhibits a thermal conductivity of 1.1 W m À 1 K À 1 at room temperature [12], the thermal conductivity follows the normal trend of decreasing with increasing mean atomic weight [4]. The low thermal conductivity of this material may be related to its two-dimensional nature, which may lead to scattering of phonons at the interfaces between the oxide and the chalcogen layers [37].…”

Section: Electrical and Thermal Transport Propertiesmentioning

confidence: 96%

“…The Bi-O-Se phase diagram was studied in detail by Oppermann et al [6][7][8][9][10][11], while the thermoelectric properties of Bi 2 O 2 Se were first reported by Ruleova et al [12]. Experimental [13,14], and theoretical studies [15,16], of this material, which is an n-type semiconductor with a reported ZT ¼0.007 at 300 K [12], have been carried out. Recently, the related oxychalcogenides [BiO][CuQ] (Q¼ S, Se, Te), which consist of [Bi 2 O 2 ] 2 þ layers alternating with [Cu 2 Q 2 ] 2 À layers [17], have been identified as promising p-type thermoelectric materials.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterisation and thermoelectric properties of the oxytelluride Bi2O2Te

Luu

Vaqueiro

2015

Journal of Solid State Chemistry

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a b s t r a c tBi 2 O 2 Te was synthesised from a stoichiometric mixture of Bi, Bi 2 O 3 and Te by a solid state reaction. Analysis of powder X-ray diffraction data indicates that this material crystallises in the anti-ThCr 2 Si 2 structure type (space group I4/mmm), with lattice parameters a¼ 3.98025(4) and c¼ 12.70391(16) Å. The electrical and thermal transport properties of Bi 2 O 2 Te were investigated as a function of temperature over the temperature range 300 rT (K)r 665. These measurements indicate that Bi 2 O 2 Te is an n-type semiconductor, with a band gap of 0.23 eV. The thermal conductivity of Bi 2 O 2 Te is remarkably low for a crystalline material, with a value of only 0.91 W m À 1 K À 1 at room temperature.

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Section: Electrical and Thermal Transport Propertiesmentioning

confidence: 71%

Section: Electrical and Thermal Transport Propertiesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterisation and thermoelectric properties of the oxytelluride Bi2O2Te

Luu

Vaqueiro

2015

Journal of Solid State Chemistry

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“…As reported by Ruleova et al [13], Bi 2 O 2 Se exhibits a very low thermal conductivity (0.7~0.75 Wm − 1 ·K − 1 at 800 K), combined with moderate power factor; hence it is expected to be a potential thermoelectric oxide. This compound is formed by partial replacement of selenium atoms with oxygen atoms in Bi 2 Se 3 , which belongs to so-called Sillen compounds and shows a (Na 0.25 Bi 0.75 ) 2 O 2 Cl-type structure (D 4h 17 ).…”

Section: Introductionmentioning

confidence: 71%

Enhanced Thermoelectric Performance of Bi2O2Se with Ag Addition

et al. 2015

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Polycrystalline Bi2O2Se/Ag nanocomposites were synthesized by spark plasma sintering process. Their thermoelectric properties were evaluated from 300 to 673 K. With the addition of silver, the conductive second phase Ag2Se and Ag can be observed, which results in a significant enhancement of electrical conductivity. The maximum conductivity is 691.8 S cm−1 for Bi2O2Se/20 vol.% Ag, which increased nearly 500 higher times than the pure Bi2O2Se bulk. ZT value can be enhanced greatly, ~0.07, for Bi2O2Se/5 vol.% Ag at 673 K, which is two times larger than the pure sample.

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“…Cobaltites are p‐type materials with zT

\approx

1 due to the beneficial electronic transport properties and a low thermal conductivity of 2 W m −1 K −1 . Currently cobaltites with zT values around 1 and oxyselenides represent the state‐of the art p‐type materials for oxides and oxide‐related ones. Their performance is attributed to a combination of electronic properties and low thermal conductivity, which in turn is related to the underlying crystal structures.…”

Section: Thermoelectric Oxides: State Of the Artmentioning

confidence: 99%

A chemists view: Metal oxides with adaptive structures for thermoelectric applications

Kieslich

Cerretti

Veremchuk

et al. 2016

Physica Status Solidi (a)

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Thermoelectric devices can help to tackle future challenges in the energy sector through the conversion of waste heat directly into usable electric energy. For a wide applicability low-cost materials with reasonable thermoelectric performances and cost-efficient preparation techniques are required. In this context metal oxides are an interesting class of materials because of their inherenthigh-temperature stability and relative high sustainability. Their thermoelectric performance, however, needs to be improved for wide application. Compounds with adaptive structures are a very interesting class of materials. A slight reduction of early transition metal oxides generates electrons as charge carriers and crystallographic shear planes as structure motif. The crystallographic shear planes lead to a reduction of intrinsic thermal conductivity. At the same time, the electronic transport properties can be tuned by the degree of reduction. So far only a few transition metal oxides with adaptive structures have been investigated with respect to their thermoelectric properties, leaving much room for improvement. This review gives an overview of thermoelectric oxides, highlights the structural aspects of the crystallographic shear planes and the resulting thermoelectric properties. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei

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Thermoelectric properties of Bi2O2Se

Cited by 190 publications

References 11 publications

Synthesis, characterisation and thermoelectric properties of the oxytelluride Bi2O2Te

Synthesis, characterisation and thermoelectric properties of the oxytelluride Bi2O2Te

Enhanced Thermoelectric Performance of Bi2O2Se with Ag Addition

A chemists view: Metal oxides with adaptive structures for thermoelectric applications

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