Levers for Thermoelectric Properties in Titania-Based Ceramics

Backhaus‐Ricoult, M.; Rustad, James R.; Vargheese, Deenamma; Dutta, Indrajit; Work, Kim

doi:10.1007/s11664-012-2019-4

Cited by 37 publications

(21 citation statements)

References 19 publications

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“…Also, other thermoelectric materials like SiGe alloys [174,175] or silicon [176] showed great improvement due to the application of FAST/SPS. Also nanostructured bulk oxides like Ga-doped ZnO, [177,178] TiO 2 , [179] or SiTiO 3 [180] were characterized with respect to their thermoelectric properties and generally show a reduction in thermal conductivity when compared to their polycrystalline reference. A further development is the combination of mechanical alloying and FAST/SPS to produce nanostructured or fine grained compound materials as shown for AgPb m SbTe 2þm [181] Hierarchical nano-and microstructured composite materials fabricated by FAST/SPS exhibit current record values in the thermoelectric efficiency.…”

Section: Nanostructured Materialsmentioning

confidence: 99%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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Field-assisted sintering technology/Spark plasma sintering is a low voltage, direct current (DC) pulsed current activated, pressure-assisted sintering, and synthesis technique, which has been widely applied for materials processing in the recent years. After a description of its working principles and historical background, mechanical, thermal, electrical effects in FAST/SPS are presented along with the role of atmosphere. A selection of successful materials development including refractory materials, nanocrystalline functional ceramics, graded, and non-equilibrium materials is then discussed. Finally, technological aspects (advanced tool concepts, temperature measurement, finite element simulations) are covered.

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Section: Nanostructured Materialsmentioning

confidence: 99%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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“…We therefore use quasiparticle band structures for calculating transport properties, improving on previous theoretical work that investigated only the rutile polymorph without quasiparticle corrections. 27 We interpolate the quasiparticle band structures with the maximally localized Wannier function (MLWF) method. 28,29 Basis sets of 26 MLWFs for anatase and rutile and 104 MLWFs for brookite interpolate the band structures with a maximum error of 10 meV for states within 2 eV from the band edges.…”

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confidence: 99%

Theoretical limits of thermoelectric figure of merit inn-typeTiO2polymorphs

Bayerl

Kioupakis

2015

Phys. Rev. B

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We calculate the conduction band structures and n-type thermoelectric transport properties for the TiO2 polymorphs rutile, anatase, and brookite from first principles within the constantrelaxation-time approximation. Although the Seebeck coefficient is nearly isotropic in all polymorphs, the power factor is anisotropic and takes its largest values along [100] in rutile and anatase, and along [010] for brookite. We also identify the free-carrier concentrations and temperatures that maximize the power factor. Our results for the theoretical upper bounds of the figure of merit at high temperature show that optimized rutile exhibits thermoelectric conversion efficiency that is superior to anatase and brookite and can reach values desirable for waste-heat recovery applications.

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“…Recently, a homologous series of reduced early titanium oxides , the so‐called Magnéli phases, came into the focus of thermoelectric research . Structurally related to Ruddlesden–Popper phases through the ReO 3 parent structure , they attracted attention during the 70s due to the occurrence of charge density waves in the low temperature regime .…”

Section: Oxides With Adaptive Structuresmentioning

confidence: 99%

“…Although modeling of the electronic structure is difficult because of the large unit cell and disorder, the degree of reduction in the homologous series allows the targeted manipulation and optimization of the electronic transport properties. So far, only a limited number of studies on the high temperature thermoelectric properties of Magnéli oxides of titanium and related composites are available This group of chemically inert and physically compounds has a potential as stable compounds and may close the gap between n‐type and p‐type oxide materials. Some of the most important results are illustrated and compiled in Fig.…”

Section: Oxides With Adaptive Structuresmentioning

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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Levers for Thermoelectric Properties in Titania-Based Ceramics

Cited by 37 publications

References 19 publications

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

Theoretical limits of thermoelectric figure of merit inn-typeTiO2polymorphs

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

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