Determination of the thermal diffusivity and specific heat using an exponential heat pulse, including heat-loss effects

Vining, Cronin B.; Zoltan, A.; Vandersande, Jan W.

doi:10.1007/bf00500724

Cited by 12 publications

(3 citation statements)

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“…Thermal diffusivity D and specic heat C P were measured by a laser ash method on a Netzsch LFA457 with a Pyroceram9606 standard. 16 The Hall coefficient R H measurement was performed at 300 K on a Quantum Design PPMS-9T using a four-probe conguration, with the magnetic eld sweeping between AE4.0 T. Then the carrier concentration p and Hall mobility m H were calculated using p ¼ À(1/eR H ) and m H ¼ sR H , respectively.…”

Section: Introductionmentioning

confidence: 99%

Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe₂)₁₅(GeTe)₈₅ thermoelectric materials

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe₂)₁₅(GeTe)₈₅ thermoelectric materials

et al. 2014

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“…In all these cases, these circular disks are frequently used directly for measuring the thermal diffusivity in the laser flash technique 26 and can also be used for measuring the Seebeck coefficient 27,28 along the same direction (parallel to the pressing direction). The same sample geometry can be used for measuring the resistivity and Hall coefficient in the VDP method but the measurements are performed in the plane of the disk.…”

Section: B Application In Thermoelectricsmentioning

confidence: 99%

Measurement of the electrical resistivity and Hall coefficient at high temperatures

Borup

Toberer

Zoltan

et al. 2012

Review of Scientific Instruments

237

215

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Study of laser megajoule calorimeter's thermal behaviour for energy measurement uncertainty optimisation Rev. Sci. Instrum. 84, 014902 (2013) Impedance spectroscopy on ceramic materials at high temperatures, considering stray fields and electromagnetic noise Rev. Sci. Instrum. 84, 015118 (2013) An apparatus for concurrent measurement of thermoelectric material parameters Rev. Sci. Instrum. 84, 013907 (2013) Casimir probe based upon metallized high Q SiN nanomembrane resonator Rev. Sci. Instrum. 84, 015115 (2013) Four-electrode impedance spectrometer for investigation of solid ion conductors Rev. Sci. Instrum. 84, 013902 (2013) Additional information on Rev. Sci. Instrum. The implementation of the van der Pauw (VDP) technique for combined high temperature measurement of the electrical resistivity and Hall coefficient is described. The VDP method is convenient for use since it accepts sample geometries compatible with other measurements. The technique is simple to use and can be used with samples showing a broad range of shapes and physical properties, from near insulators to metals. Three instruments utilizing the VDP method for measurement of heavily doped semiconductors, such as thermoelectrics, are discussed.

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“…Many methods exist for measuring thermal conductivity, k. While the most frequently used method today is ash diffusivity, [74][75][76] (see Fig. 7a) traditionally direct methods were employed (Fig.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Measuring thermoelectric transport properties of materials

Borup

Boor

Wang

et al. 2015

Energy Environ. Sci.

304

256

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In this review we discuss considerations regarding the common techniques used for measuring thermoelectric transport properties necessary for calculating the thermoelectric figure of merit, zT.Advice for improving the data quality in Seebeck coefficient, electrical resistivity, and thermal conductivity (from flash diffusivity and heat capacity) measurements are given together with methods for identifying possible erroneous data. Measurement of the Hall coefficient and calculation of the charge carrier concentration and mobility is also included due to its importance for understanding materials. It is not intended to be a complete record or comparison of all the different techniques employed in thermoelectrics. Rather, by providing an overview of common techniques and their inherent difficulties it is an aid to new researchers or students in the field. The focus is mainly on high temperature measurements but low temperature techniques are also briefly discussed. Measurement guide for authors and reviewersMeasurements should always be repeatable on the same sample, and on new samples produced in the manner described. Thermoelectric effects are steady-state effects so any time dependence or hysteresis is indication that phenomena outside thermoelectric effects are at play. Materials with chemical oxidants/ reductants incorporated are likely to contain unstable internal voltages not due to thermoelectric effects. Unconventional samples or measurement methods deserve reexamination of assumptions. AccuracyTrue accuracy is not represented by a single heating curve from one sample, even with error bars representing instrument precision. Showing heating and cooling data and multiple samples gives a better indication of measurement variability for a typical type of sample. Anisotropy, cracks and inhomogeneities can lead to large variation in measurements. One unusual data point or sample outside the trend, particularly at temperatures just prior to decomposition, usually indicates a problem in sample or measurement. Unusual resultsTypical thermoelectric materials behave like heavily doped semiconductors with thermopower (absolute value of Seebeck coefficient) of less than 300 mV K À1 , resistivity of 0.1-10 mU cm, and are optimized when electronic contribution to the thermal conductivity is about 1/2 the total thermal conductivity. Extraordinary results should be checked by extra means. Unusual results can be caused by bad contacts, thermocouples that have broken, chemically reacted, or simply dried out of calibration. Exceptional resultsReported values of zT > 1 or in unexpected materials receive extra attention from reviewers who may ask for additional conrmation. Convincing measurements may need to be performed on the same sample along the same direction and be repeatable with other samples and measurement methods. There is no official record keeping for claimed or veried zT values. Several papers, patents and press releases have claimed extraordinarily high zT but most have been forgotten over time and likely resul...

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Determination of the thermal diffusivity and specific heat using an exponential heat pulse, including heat-loss effects

Cited by 12 publications

References 11 publications

Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe₂)₁₅(GeTe)₈₅ thermoelectric materials

Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe₂)₁₅(GeTe)₈₅ thermoelectric materials

Measurement of the electrical resistivity and Hall coefficient at high temperatures

Measuring thermoelectric transport properties of materials

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Determination of the thermal diffusivity and specific heat using an exponential heat pulse, including heat-loss effects

Cited by 12 publications

References 11 publications

Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe2)15(GeTe)85 thermoelectric materials

Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe2)15(GeTe)85 thermoelectric materials

Measurement of the electrical resistivity and Hall coefficient at high temperatures

Measuring thermoelectric transport properties of materials

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Product

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Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe₂)₁₅(GeTe)₈₅ thermoelectric materials

Ioffe–Regel limit and lattice thermal conductivity reduction of high performance (AgSbTe₂)₁₅(GeTe)₈₅ thermoelectric materials