Iron Disilicide as High-Temperature Reference Material for Traceable Measurements of Seebeck Coefficient Between 300 K and 800 K

Ziółkowski, Pawel; Stiewe, Christian; Boor, Johannes de; Druschke, Ines; Zabrocki, Knud; Edler, Frank; Haupt, Sebastian; König, Jan; Mueller, E.

doi:10.1007/s11664-016-4850-5

Cited by 23 publications

(18 citation statements)

References 46 publications

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“…For that reason measurement precision (related to reproducibility) is more relevant in the following than measurement accuracy (closeness of the measurement to the true value). Based on periodic reference measurements precision is specified as ±2%, ±5%, ±5% and ±10% for , , and H (and shown as error bars in the following), while measurement accuracy is given by ±5%, ±5%, ±8% and ±10% based on comparison with the NIST standard reference material 3451 and international round robin tests [41,54,55]. [56][57][58].…”

Section: Methodsmentioning

confidence: 99%

Systematic analysis of the interplay between synthesis route, microstructure, and thermoelectric performance in p-type Mg2Si0.2Sn0.8

Kamila

Goyal

Sankhla

et al. 2019

Materials Today Physics

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Section: Methodsmentioning

confidence: 99%

Systematic analysis of the interplay between synthesis route, microstructure, and thermoelectric performance in p-type Mg2Si0.2Sn0.8

Kamila

Goyal

Sankhla

et al. 2019

Materials Today Physics

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“…As a consequence, C p was approximated by the Dulong–Petit limit to calculate the thermal conductivity. We specified the uncertainties for S , σ and κ , for the different samples as ± 5%, ± 5% and ± 8% based on a comparison with the National Institute of Standards and Technology (NIST) low temperature standard for the Seebeck coefficient [34] and internal reference measurements on a high temperature standard [35]. Our estimates were comparable to the numbers obtained in an international round robin test.…”

Section: Methodsmentioning

confidence: 90%

Insight on the Interplay between Synthesis Conditions and Thermoelectric Properties of α-MgAgSb

et al. 2019

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α-MgAgSb is a very promising thermoelectric material with excellent thermoelectric properties between room temperature and 300 °C, a range where few other thermoelectric materials show good performance. Previous reports rely on a two-step ball-milling process and/or time-consuming annealing. Aiming for a faster and scalable fabrication route, herein, we investigated other potential synthesis routes and their impact on the thermoelectric properties of α-MgAgSb. We started from a gas-atomized MgAg precursor and employed ball-milling only in the final mixing step. Direct comparison of high energy ball-milling and planetary ball-milling revealed that high energy ball milling already induced formation of MgAgSb, while planetary ball milling did not. This had a strong impact on the microstructure and secondary phase fraction, resulting in superior performance of the high energy ball milling route with an attractive average thermoelectric figure of merit of z T avg = 0.9. We also show that the formation of undesired secondary phases cannot be avoided by a modification of the sintering temperature after planetary ball milling, and discuss the influence of commonly observed secondary phases on the carrier mobility and on the thermoelectric properties of α-MgAgSb.

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“…This is required to ensure a homogeneous electrical current at the junctions and a uniform Peltier effect. A very thin layer of Ga 62 In 22 Sn 16 liquid metal (Ref.…”

Section: Methodsmentioning

confidence: 99%

“…We also evaluated the effect of the variation of the current amplitude in the impedance spectra using a 2.08 mm Â 2.01 mm Â 8.00 mm Fe 0.95 Co 0.05 Si 2 sample, 16 whose electrical resistivity is around 10 times higher than that for the skutterudite material and, moreover, unlike the skutterudite material, it decreases with temperature [see Fig. S3(a)].…”

Section: -4mentioning

confidence: 99%

Thermal conductivity, electrical resistivity, and dimensionless figure of merit (ZT) determination of thermoelectric materials by impedance spectroscopy up to 250 °C

Beltrán-Pitarch

Prado‐Gonjal

Powell

et al. 2018

Journal of Applied Physics

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Impedance spectroscopy has been shown as a promising method to characterize thermoelectric (TE) materials and devices. In particular, the possibility to determine the thermal conductivity λ, electrical conductivity σ, and the dimensionless figure of merit ZT of a TE element, if the Seebeck coefficient S is known, has been reported, although so far for a high-performance TE material (Bi2Te3) at room temperature. Here, we demonstrate the capability of this approach at temperatures up to 250 °C and for a material with modest TE properties. Moreover, we compare the results obtained with values from commercial equipment and quantify the precision and accuracy of the method. This is achieved by measuring the impedance response of a skutterudite material contacted by Cu contacts. The method shows excellent precision (random errors < 4.5% for all properties) and very good agreement with the results from commercial equipment (<4% for λ, between 4% and 6% for σ, and <8% for ZT), which proves its suitability to accurately characterize bulk TE materials. Especially, the capability to provide λ with good accuracy represents a useful alternative to the laser flash method, which typically exhibits higher errors and requires the measurement of additional properties (density and specific heat), which are not necessarily needed to obtain the ZT.

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Iron Disilicide as High-Temperature Reference Material for Traceable Measurements of Seebeck Coefficient Between 300 K and 800 K

Cited by 23 publications

References 46 publications

Systematic analysis of the interplay between synthesis route, microstructure, and thermoelectric performance in p-type Mg2Si0.2Sn0.8

Systematic analysis of the interplay between synthesis route, microstructure, and thermoelectric performance in p-type Mg2Si0.2Sn0.8

Insight on the Interplay between Synthesis Conditions and Thermoelectric Properties of α-MgAgSb

Thermal conductivity, electrical resistivity, and dimensionless figure of merit (ZT) determination of thermoelectric materials by impedance spectroscopy up to 250 °C

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