Thermoelectric Properties of Solution Combustion Synthesized Al-Doped ZnO

Zhang, Lihua; Tosho, Tsuyoshi; Okinaka, Noriyuki; Akiyama, Tomohiro

doi:10.2320/matertrans.maw200801

Cited by 30 publications

(21 citation statements)

References 25 publications

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“…Since the porosity may have a significant effect on electrical and thermal conductivities, the experimental data for r and j were corrected, assuming that spherical pores are homogeneously distributed in the material, as described in Ref. 35. …”

Section: Resultsmentioning

confidence: 99%

Enhancement of thermoelectric performance in strontium titanate by praseodymium substitution

Kovalevsky

Yaremchenko

Populoh

et al. 2013

Journal of Applied Physics

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In order to identify the effects of Pr additions on thermoelectric properties of strontium titanate, crystal structure, electrical and thermal conductivity, and Seebeck coefficient of Sr1−xPrxTiO3 (x = 0.02–0.30) materials were studied at 400 < T < 1180 K under highly reducing atmosphere. The mechanism of electronic transport was found to be similar up to 10% of praseodymium content, where generation of the charge carriers upon substitution resulted in significant increase of the electrical conductivity, moderate decrease in Seebeck coefficient, and general improvement of the power factor. Formation of point defects in the course of substitution led to suppression of the lattice thermal conductivity, whilst the contribution from electronic component was increasing with carrier concentration. Possible formation of layered structures and growing distortion of the perovskite lattice resulted in relatively low thermoelectric performance for Sr0.80Pr0.20TiO3 and Sr0.70Pr0.30TiO3. The maximum dimensionless figure of merit was observed for Sr0.90Pr0.10TiO3 and amounted to ∼0.23 at 670 K and ∼0.34 at 1170 K, close to the values, obtained in similar conditions for the best bulk thermoelectrics, based on rare-earth substituted SrTiO3.

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Section: Resultsmentioning

confidence: 99%

Enhancement of thermoelectric performance in strontium titanate by praseodymium substitution

Kovalevsky

Yaremchenko

Populoh

et al. 2013

Journal of Applied Physics

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“…As an example, assuming that spherical pores are homogeneously distributed in the material and applying Maxwell correction for porosity 50 The cumulative impact of the electrical and thermal transport properties on the thermoelectric performance is illustrated by the temperature dependence of the dimensionless figure of merit ZT (Fig. 9).…”

Section: Chemistry Of Materialsmentioning

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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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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“…As the samples showed a significant level of porosity (Table 1, Fig. 3), the experimental data for σ were corrected assuming that spherical pores are homogeneously distributed in the ceramics bulk [60]. Taking into account the results of XPS studies, one may assume that the charge compensation mechanism in Wsubstituted SrTiO 3 includes the formation of electronic defects (Eq.…”

Section: Effects Of Composition and Sintering Conditions On Site Occumentioning

confidence: 99%

“…9A were corrected for porosity effects [60]. The lattice contribution to the thermal conductivity (κ ph ), estimated from Wiedemann-Franz´ law (κ ph =κ-LTσ, where L is the Sommerfeld value (2.45·10 -8 W×Ω×K -2 ) of the Lorenz number [63]) is presented in Fig.…”

Section: Thermoelectric Propertiesmentioning

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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Thermoelectric Properties of Solution Combustion Synthesized Al-Doped ZnO

Cited by 30 publications

References 25 publications

Enhancement of thermoelectric performance in strontium titanate by praseodymium substitution

Enhancement of thermoelectric performance in strontium titanate by praseodymium substitution

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

Design of SrTiO₃-Based Thermoelectrics by Tungsten Substitution

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Thermoelectric Properties of Solution Combustion Synthesized Al-Doped ZnO

Cited by 30 publications

References 25 publications

Enhancement of thermoelectric performance in strontium titanate by praseodymium substitution

Enhancement of thermoelectric performance in strontium titanate by praseodymium substitution

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

Design of SrTiO3-Based Thermoelectrics by Tungsten Substitution

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Design of SrTiO₃-Based Thermoelectrics by Tungsten Substitution