Texture of bismuth telluride-based thermoelectric semiconductors processed by high-pressure torsion

Ashida, Maki; Hamachiyo, Takashi; Hasezaki, Kazuhiro; Matsunoshita, Hirotaka; Kai, Masahiro; Horita, Zenji

doi:10.1016/j.jpcs.2009.06.002

Cited by 36 publications

(18 citation statements)

References 10 publications

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“…HPT processing gave rise to an increased power factor S 2 /q caused by a (110) texture contributing to both a low resistivity and a high Seebeck coefficient, 76 whereas a real increase of ZT was achieved by the ECAP procedure 77 by carefully choosing the ECAP temperature and path to obtain a high carrier mobility, thus minimizing the electrical resistivity and thereby achieving a figure of merit as high as ZT = 2.3.…”

Section: Thermoelectricity and Superconductivitymentioning

confidence: 99%

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Valiev

Estrin

Horita

et al. 2016

JOM

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408

186

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It is now well established that the processing of bulk solids through the application of severe plastic deformation (SPD) leads to exceptional grain refinement to the submicrometer or nanometer level. Extensive research over the last decade has demonstrated that SPD processing also produces unusual phase transformations and leads to the introduction of a range of nanostructural features, including nonequilibrium grain boundaries, deformation twins, dislocation substructures, vacancy agglomerates, and solute segregation and clustering. These many structural changes provide new opportunities for fine tuning the characteristics of SPD metals to attain major improvements in their physical, mechanical, chemical, and functional properties. This review provides a summary of some of these recent developments. Special emphasis is placed on the use of SPD processing in achieving increased electrical conductivity, superconductivity, and thermoelectricity, an improved hydrogen storage capability, materials for use in biomedical applications, and the fabrication of high-strength metal-matrix nanocomposites.

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Section: Thermoelectricity and Superconductivitymentioning

confidence: 99%

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Valiev

Estrin

Horita

et al. 2016

JOM

Self Cite

408

186

View full text Add to dashboard Cite

show abstract

“…There have been several attempts to increase ZT by application of SPD, mainly HPT [147] and ECAP. [148] HPT processing gave rise to an increased power factor S 2 /ρ due to a (110) texture contributing to both a low resistivity and a high Seebeck coefficient (Figure 20,[147]).…”

Section: Thermoelectricsmentioning

confidence: 99%

Fundamentals of Superior Properties in Bulk NanoSPD Materials

Valiev

Estrin

Horita

et al. 2015

Materials Research Letters

302

136

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Bulk nanoSPD materials are materials with nanostructural features, such as nanograins, nanoclusters, or nanotwins, produced by severe plastic deformation (SPD) techniques. Such nanostructured materials are fully dense and contamination free and in many cases they have superior mechanical and functional properties. Here, we provide a critical overview of such materials, with a focus on the fundamentals for the observed extraordinary properties. We discuss the unique nanostructures that lead to the superior properties, the underlying deformation mechanisms, the critical issues that remain to be investigated, future research directions, and the application potential of such materials.

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“…These effects seem to ameliorate the performance of a thermoelectric material [1][2][3][4][5][6], which is characterised by the figure of merit…”

Section: Introductionmentioning

confidence: 99%

Effect of HPT processing on the structure, thermoelectric and mechanical properties of Sr0.07Ba0.07Yb0.07Co4Sb12

Rogl

Aabdin

Schafler

et al. 2012

Journal of Alloys and Compounds

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Texture of bismuth telluride-based thermoelectric semiconductors processed by high-pressure torsion

Cited by 36 publications

References 10 publications

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Fundamentals of Superior Properties in Bulk NanoSPD Materials

Effect of HPT processing on the structure, thermoelectric and mechanical properties of Sr0.07Ba0.07Yb0.07Co4Sb12

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