Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Cui, Yanjie; Salvador, James R.; Yang, Jihui; Wang, Hsin; Amow, G.; Kleinke, Holger

doi:10.1007/s11664-008-0651-9

Cited by 39 publications

(32 citation statements)

References 19 publications

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“…28 The samples demonstrate fairly similar microstructures, with the grain size moderately increasing on substitution with tantalum. Typical SEM micrographs are shown in Fig.…”

Section: Resultsmentioning

confidence: 88%

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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“…28 The samples demonstrate fairly similar microstructures, with the grain size moderately increasing on substitution with tantalum. Typical SEM micrographs are shown in Fig.…”

Section: Resultsmentioning

confidence: 88%

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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“…Compared to the diverse number of options for A-site substitution, the set of appropriate cations to substitute in B-site as a donor is, however, limited to niobium, tantalum, molybdenum and tungsten, if one considers reasonable natural abundance and other critical limitations 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 4 such as toxicity. However, only substitution with niobium has been assessed in sufficiently systematic way for various energy conversion options, while the literature data on other cations are very scarce (e.g, [26]). …”

Section: Introductionmentioning

confidence: 99%

Design of SrTiO₃-Based Thermoelectrics by Tungsten Substitution

et al. 2015

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Among n-type oxide thermoelectrics, donor-substituted strontium titanates, prepared in highlyreducing conditions, show particularly attractive thermoelectric figure of merit. High electrical conductivity, combined with outstanding redox tolerance and perovskite-phase stability of these materials, also make them prospective candidates for SOFC anode components. This work represents a first attempt to process strontium titanate ceramics with significant W for Ti substitution, and to assess their relevant defect chemistry-related aspects, electrical and thermal properties, seeking mainly highlyperforming oxide thermoelectrics. Combined XRD/XPS/SEM/EDS studies of SrTi 1-x W x O 3±δ (x=0.01-0.10), prepared by a conventional solid state route, demonstrated that the maximum solubility of tungsten corresponds to 3-5% mol, depending on firing conditions and other composition changes.Separation of tungsten-containing phases on a submicro-and nanoscale level and formation of core-shell microstructures was confirmed for x≥0.06, suggesting possibilities for tuning the thermal and electrical conductivities. Titanium cations are substituted predominantly by W 6+ and partially by W 5+ . High electrical conductivity and Seebeck coefficient resulted in maximum power factor of ~0.5 mW×m -1 ×K -2 for SrTi 0.99 W 0.01 O 3±δ ; maximum ZT values, observed in the case of x=0.01-0.06, amounted to 0.18-0.24 at 1173-1273 K. Co-substitution in Sr(Ti,Nb,W)TiO 3±δ materials showed good prospects for boosting thermoelectric performance in titanates, predominantly by significant reduction of the thermal conductivity.

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“…4) show that the dominant charge carriers in all five oxides are n-type. LaMo 8 O 14 exhibits the highest Seebeck coefficient of −137 V/K at room temperature, which is comparable with other outstanding thermoelectric oxides like NaCo 2 O 4 [6], SrTi 1−x Ta x O 3 [13], and CaMn 1−x Nb x O 3 [15]. As for LaMo 8 Seebeck coefficient decreases with increasing temperature, which is not favorable for thermoelectric applications at high temperatures.…”

Section: Physical Propertiesmentioning

confidence: 78%

“…In recent years, some n-type thermoelectric oxides with the perovskite-type structure were studied, e.g. SrTiO 3 [9][10][11][12][13] and CaMnO 3 [14,15]. However, compared with p-type cobalt oxides, n-type thermoelectric oxides are still much less efficient.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of molybdenum oxides LnMo8O14 (Ln = La, Ce, Pr, Nd and Sm)

Sonne

Pryds

et al. 2010

Journal of Alloys and Compounds

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Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Cited by 39 publications

References 19 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

Design of SrTiO₃-Based Thermoelectrics by Tungsten Substitution

Thermoelectric properties of molybdenum oxides LnMo8O14 (Ln = La, Ce, Pr, Nd and Sm)

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Thermoelectric Properties of Heavily Doped n-Type SrTiO3 Bulk Materials

Cited by 39 publications

References 19 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

Design of SrTiO3-Based Thermoelectrics by Tungsten Substitution

Thermoelectric properties of molybdenum oxides LnMo8O14 (Ln = La, Ce, Pr, Nd and Sm)

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Design of SrTiO₃-Based Thermoelectrics by Tungsten Substitution