Semiconducting large bandgap oxides as potential thermoelectric materials for high-temperature power generation?

Backhaus‐Ricoult, M.; Rustad, James R.; Moore, Lisa A.; Smith, Charlene M.; Brown, J.S.

doi:10.1007/s00339-014-8515-z

Cited by 74 publications

(59 citation statements)

References 81 publications

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“…5,10 It should be noticed that high-temperature operation also yields higher Carnot efficiency of the conversion. A unique feature of the oxide materials is their redox flexibility, which allows controlled 4 defect chemistry engineering by interaction with the atmosphere, in addition to heterovalent substitution effects.…”

Section: Introductionmentioning

confidence: 97%

“…5,[11][12][13][14][15][16][17][18] Partial A-site substitution by rare-earth elements and B-site substitution by some transition metal cations, having stable oxidation state higher than four, are usually used as donor additives in SrTiO 3 to attain reasonable electrical conductivity. In many cases, the substitution also suppresses the thermal conductivity by impurity scattering.…”

Section: Introductionmentioning

confidence: 99%

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Boosting Thermoelectric Performance by Controlled Defect Chemistry Engineering in Ta-Substituted Strontium Titanate

Yaremchenko¹,

Populoh

Patrício³

et al. 2015

Chem. Mater.

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Inspired by recent research results that have demonstrated appealing thermoelectric performance of A-site cation-deficient titanates, this work focuses on detailed analysis of the changes in performance promoted by altering the defect chemistry mechanisms. The series of cation-stoichiometric SrTi 1-x Ta x O 3±δ and A-site deficient Sr 1-x/2 Ti 1-x Ta x O 3-δ compositions (0.05≤x≤ 0.30) with cubic perovskite-like structure were selected to demonstrate the defect chemistry engineering approaches, which result in promising electric and thermal properties. High power factors were observed in compositions where appropriate concentration of the charge carriers and their mobility were attained by presence of strontium-and oxygen vacancies and suppressed formation of the oxygen-rich layers. Noticeable deviations from stoichiometric oxygen content were found to decrease the lattice thermal conductivity, suggesting good phonon scattering ability for oxygen vacancies, vacant A-sites and oxygen-excessive defects, while the effect from donor substitution on the thermal transport was less pronounced. The obtained guidelines for the defect chemistry engineering in donor-substituted strontium titanates open new possibilities for boosting the thermoelectric performance, especially if followed by complementary microstructural design to further promote electrical and thermal transport.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Boosting Thermoelectric Performance by Controlled Defect Chemistry Engineering in Ta-Substituted Strontium Titanate

Yaremchenko¹,

Populoh

Patrício³

et al. 2015

Chem. Mater.

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“…However, this property can be improved via doping process that allows introducing the electrically active dopants into the host lattice to increase the free carrier concentration. 5) It means that the amount of charge carriers and thus the electrical conductivity and thermoelectric properties in this system can be tuned by using suitable substitution elements. Dopants with a higher or lower oxidation level than the host ion will act as donors (n-type) or acceptors (p-type).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Singly and Dually Doping Effect on Scattering Mechanisms and Thermoelectric Properties of Perovskite-Type STO

2015

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This paper presents a systematic investigation of typical characterizations of Sr( 1-1.5x-0.5y )Dy x Ti 1-y Nb y O 3 composition based on single Nband Dy-doped as well as Nb/Dy co-doped SrTiO3. Nb concentration of 10, 13, 17, 20 and 24 at% and Dy concentration of 4, 8, 10, and 13 at% were used for different doping compounds. XRD data was used to calculate the lattice constants. The limit of solubility of doped element in host lattice was determined based on the graph showing the dependence of lattice parameters on doping concentration. The thermoelectric properties were investigated from 20 to 1000°C or 293 to 1273 K. The electrical conductivity increases below 600 K but decreases above 600 K with increasing doping content for all cases. This characterization reached about 900 S/cm at 570 K with 4% dysprosium and 20% niobium doped in STO. Both the electrical and thermal conductivity of single Nb-doped samples increase with increasing Nb content. In contrast, the thermal conductivity of single Dy doping decreases with increasing Dy content and consequently best absolute values of Seebeck coefficient. Generally, increasing doping concentration provides larger magnitude of Seebeck coefficient for all cases of doping. The best magnitude of the figure of merit reaches approximately 0.17 at 1273 K. The optimized composition should comprise quaternary compounds of which is Sr 0.84 Dy 0.04 -Ti 0.80 Nb 0.2 O 3 , especially for fast cooling regime.

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“…This is consistent with transport measurements on titania doped by oxygen deficiency. [54] TiOF can be formed in a tetragonal rutile structure, [55] suggesting that there could be a high solubility of F in rutile TiO 2 . One issue with TiO 2 is the tendency of the binary oxide to oxygen deficiency when processed at high temperature under reducing conditions.…”

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confidence: 99%

Perspective: n-type oxide thermoelectrics via visual search strategies

et al. 2016

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We discuss and present search strategies for finding new thermoelectric compositions based on first principles electronic structure and transport calculations. We illustrate them by application to a search for potential n-type oxide thermoelectric materials. This includes a screen based on visualization of electronic energy isosurfaces. We report compounds that show potential as thermoelectric materials along with detailed properties, including SrTiO3, which is a known thermoelectric, and appropriately doped KNbO3 and rutile TiO2.

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Semiconducting large bandgap oxides as potential thermoelectric materials for high-temperature power generation?

Cited by 74 publications

References 81 publications

Boosting Thermoelectric Performance by Controlled Defect Chemistry Engineering in Ta-Substituted Strontium Titanate

Boosting Thermoelectric Performance by Controlled Defect Chemistry Engineering in Ta-Substituted Strontium Titanate

Investigation of the Influence of Singly and Dually Doping Effect on Scattering Mechanisms and Thermoelectric Properties of Perovskite-Type STO

Perspective: n-type oxide thermoelectrics via visual search strategies

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