High-Temperature Measurement of Seebeck Coefficient and Electrical Conductivity

Boor, Johannes de; Stiewe, Christian; Ziółkowski, Pawel; Dasgupta, Titas; Karpinski, G.; Lenz, E.; Edler, Frank; Mueller, E.

doi:10.1007/s11664-012-2404-z

Cited by 104 publications

(60 citation statements)

References 21 publications

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“…This system measures the electrical conductivity in four-point inline geometry concurrently with the Seebeck coefficient. Details about measurement procedure, reference measurements and employed hardware can be found in the literature, [26] while details about the Seebeck coefficient data analysis can be found in Ref. [27] .…”

Section: Methodsmentioning

confidence: 99%

Disorder and Transport Properties of In₃SbTe₂ – an X‐ray, Neutron and Electron Diffraction Study

Schröder

Rosenthal

Grott

et al. 2013

Zeitschrift anorg allge chemie

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Abstract. Quenched metastable In 3 SbTe 2 was investigated by X-ray and neutron powder diffraction as well as by single-crystal X-ray diffraction. The average structure corresponds to the rocksalt type, the anion position being occupied by antimony and tellurium. Neutron data indicate no antisite disorder of indium and antimony. The compound is a high-temperature phase that can be quenched to yield a metastable compound at ambient temperature which, upon heating, decomposes at ca. 320°C into InSb and InTe. Diffuse scattering in reconstructed X-ray and selected area electron diffraction patterns indicates local

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Section: Methodsmentioning

confidence: 99%

Disorder and Transport Properties of In₃SbTe₂ – an X‐ray, Neutron and Electron Diffraction Study

Schröder

Rosenthal

Grott

et al. 2013

Zeitschrift anorg allge chemie

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“…Temperature-dependent electrical conductivity, σ(T), and Seebeck coeicient, S(T) (thermopower), of these pellets are measured in temperature range from 300 to ~700 K employing Nemesis ® SBA-458 apparatus (Nezsch GmbH), which is designed for simultaneous measurements of electrical conductivity and thermopower for planar geometry [76][77][78].…”

Section: Materials and Thermoelectric Property Characterizationmentioning

confidence: 99%

Silver-Antimony-Telluride: From First-Principles Calculations to Thermoelectric Applications

Amouyal¹

2016

Thermoelectrics for Power Generation - A Look at Trends in the Technology

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Silver-antimony-telluride (AgSbTe 2 ) based compounds have emerged as a promising class of materials for thermoelectric (TE) power generation at the mid-temperature range. This Chapter demonstrates utilization of irst-principles calculations for predicting TE properties of AgSbTe 2 -based compounds and experimental validations. Predictive calculations of the efects of La-doping on vibrational and electronic properties of AgSbTe 2 compounds are performed applying the density functional theory (DFT), and temperature-dependent TE transport coeicients are evaluated applying the Bolzmann transport theory (BTE). Experimentally, model ternary (AgSbTe 2 ) and quaternary (3 at. % La-AgSbTe 2 ) compounds were synthesized, for which TE transport coeicients were measured, indicating that thermal conductivity decreases due to La-alloying. The later also reduces electrical conductivity and increases Seebeck coeicients. All trends correspond with those predicted from irst-principles. Thermal stability issues are essential for TE device operation at service conditions, e.g. changes of matrix composition and second-phase precipitation, and are also addressed in this study on both computational and experimental aspects. It is shown that La-alloying afects TE igure-of-merit positively, e.g., improving from 0.35 up to 0.50 at 260 °C. We highlight the universal aspects of this approach that can be applied for other TE compounds. This enables us screening their performance prior to synthesis in laboratory.Keywords: silver-antimony-telluride, irst-principles calculations, thermoelectric transport properties, Bolzmann transport theory, latice dynamics, thermal stability IntroductionIt is of utmost technological importance to develop predictive tools that will provide us with information about design of materials' functional properties. In this context, density functional theory (DFT) irst-principle calculations ofer us such possibilities [1][2][3][4] Despite of relatively high ZT values of AgSbTe 2 phase, it is still challenging to increase them to the range of 2-3. Reaching at this limit will enable us employing this material for energy conversion at power levels >500 W [34]. Reduction in latice thermal conductivity is a conventional way to enhance TE performance and is achieved by either doping with solute elements [35] or formation of second phases to stimulate phonon scatering [36][37][38]. These latice defects afect, of course, electronic properties, mainly electrical conductivity and Seebeck coeicient. Atempts to improve TE properties of AgSbTe 2 -based alloys by doping with diferent elements [19,25,[39][40][41][42][43][44][45][46][47] Notwithstanding the aforementioned successful experimental and computational atempts, a set of experimental routines, that is initiated and directed by predictions from irst principles for complete TE performance or any other computational procedure, is missing. Thermoelectrics for Power Generation -A Look at Trends in the Technology 148A signiicant step in this direction is introduced by o...

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“…Temperature-dependent Seebeck coefficient and electrical conductivity were measured concurrently using a custom-built facility [40]. In both measurements-LFA and Seebeck/sigma-the samples' properties were measured during the heating and cooling cycle to obtain information on the thermal stability of the material.…”

Section: Materials Preparation and Measurementsmentioning

confidence: 99%

Tailoring the mechanical properties of thermoelectric lead telluride by alloying with non-doping calcium

et al. 2016

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Thermoelectric generators have a great potential in waste heat recovery and energy harvesting due to their principle of directly converting thermal into electrical energy. Despite a long history in space travel and a broad range of potential applications, TEGs are rarely found in terrestrial applications. Reasons are manufacturing problems and limited durability in dynamic operation conditions due to deficient mechanical properties of the thermoelectric materials, which often suffer from low strength and high brittleness. We present a concept for the basically independent tailoring of mechanical and thermoelectric properties. This can be achieved by the alloying of TE materials with additional elements having preferably no or only little influence on the TE properties. We demonstrate a route of improving the mechanical properties of PbTe by alloying with calcium. It is shown that calcium has minor effects on the thermoelectric properties of PbTe while significantly increasing hardness and fracture strength. As proof of concept, mechanically more stable sodium and calcium co-doped Pb 0.966 Ca 0.02 Na 0.014 Te with ZT exceeding 1.2 above 650 K is demonstrated.

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High-Temperature Measurement of Seebeck Coefficient and Electrical Conductivity

Cited by 104 publications

References 21 publications

Disorder and Transport Properties of In₃SbTe₂ – an X‐ray, Neutron and Electron Diffraction Study

Disorder and Transport Properties of In₃SbTe₂ – an X‐ray, Neutron and Electron Diffraction Study

Silver-Antimony-Telluride: From First-Principles Calculations to Thermoelectric Applications

Tailoring the mechanical properties of thermoelectric lead telluride by alloying with non-doping calcium

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High-Temperature Measurement of Seebeck Coefficient and Electrical Conductivity

Cited by 104 publications

References 21 publications

Disorder and Transport Properties of In3SbTe2 – an X‐ray, Neutron and Electron Diffraction Study

Disorder and Transport Properties of In3SbTe2 – an X‐ray, Neutron and Electron Diffraction Study

Silver-Antimony-Telluride: From First-Principles Calculations to Thermoelectric Applications

Tailoring the mechanical properties of thermoelectric lead telluride by alloying with non-doping calcium

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Disorder and Transport Properties of In₃SbTe₂ – an X‐ray, Neutron and Electron Diffraction Study

Disorder and Transport Properties of In₃SbTe₂ – an X‐ray, Neutron and Electron Diffraction Study