Pitfalls in crystallographic analysis of doped skutterudite materials

Bertini, Luca; Billquist, K.; Christensen, Mogens; Gatti, Carlo; Holmgren, L.; Iversen, Bo B.; Mueller, E.; Muhammed, M.; Noriega, G.; Palmqvist, Anders; Platzek, D.; Rowe, Daniel B.; Saramat, Ali; Stiewe, Christian; Toprak, Muhammet S.; Williams, S.G.K.; Zhang, Y.

doi:10.1109/ict.2003.1287451

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…But a SRM for the three transport coefficient (α, ρ, λ) and the resulting figure of merit all together, either at low or at high temperature, remains to be established. For this reason, measurements on thermoelectric materials are more delicate and past RRT were conducted either on metals with well known physical properties (constantan, 7-9 palladium 7 ), on home-made thermoelectric materials (skutterudite 7 ), or materials supplied by a commercial source (bismuth telluride based materials [8][9][10][11] ) but rarely on a reference material (Stainless steel NIST SRM 1460 for thermal diffusivity in Ref. 7).…”

Section: Introductionmentioning

confidence: 99%

Invited Article: A round robin test of the uncertainty on the measurement of the thermoelectric dimensionless figure of merit of Co0.97Ni0.03Sb3

Alleno

Bérardan

Byl

et al. 2015

Review of Scientific Instruments

103

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A round robin test aiming at measuring the high-temperature thermoelectric properties was carried out by a group of European (mainly French) laboratories (labs). Polycrystalline skutterudite Co0.97Ni0.03Sb3 was characterized by Seebeck coefficient (8 labs), electrical resistivity (9 labs), thermal diffusivity (6 labs), mass volume density (6 labs), and specific heat (6 labs) measurements. These data were statistically processed to determine the uncertainty on all these measured quantities as a function of temperature and combined to obtain an overall uncertainty on the thermal conductivity (product of thermal diffusivity by density and by specific heat) and on the thermoelectric figure of merit ZT. An increase with temperature of all these uncertainties is observed, in agreement with growing difficulties to measure these quantities when temperature increases. The uncertainties on the electrical resistivity and thermal diffusivity are most likely dominated by the uncertainty on the sample dimensions. The temperature-averaged (300-700 K) relative standard uncertainties at the confidence level of 68% amount to 6%, 8%, 11%, and 19% for the Seebeck coefficient, electrical resistivity, thermal conductivity, and figure of merit ZT, respectively. Thermal conductivity measurements appear as the least accurate. The moderate value of the temperature-averaged relative expanded (confidence level of 95%) uncertainty of 17% on the mean of ZT is essential in establishing Co0.97Ni0.03Sb3 as a high temperature standard n-type thermoelectric material.

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Section: Introductionmentioning

confidence: 99%

Invited Article: A round robin test of the uncertainty on the measurement of the thermoelectric dimensionless figure of merit of Co0.97Ni0.03Sb3

Alleno

Bérardan

Byl

et al. 2015

Review of Scientific Instruments

103

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“…Nanocomposites, as an efficient way to reduce the thermal conductivity via grain boundaries and nanoinclusions, have also been used in CoSb 3 based TE materials. Significant advances have been made in recent years with various kinds of nanoinclusion filling the cages in this compound (Bertini et al, 2003; Zhao et al, 2006; Li et al, 2009; Yang et al, 2009; Xiong et al, 2010; Fu et al, 2015) and shown in Figure 8. Fu et al (2015) reported formation of core-shell microstructure in compounds doped with 2% of Ni, has enhanced ZT to 1.07 at 723 K. Li et al (2009) observed in situ formation of InSb nanoislands in the In 0.2 Ce 0.5 Co 4 Sb 12 nanocomposite with enhanced ZT up to 1.43 at 800 K by significant reduction in thermal conductivity.…”

Section: Research Progress On Nanostructured Te Materialsmentioning

confidence: 99%

Engineering Nanostructural Routes for Enhancing Thermoelectric Performance: Bulk to Nanoscale

et al. 2015

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Thermoelectricity is a very important phenomenon, especially its significance in heat-electricity conversion. If thermoelectric devices can be effectively applied to the recovery of the renewable energies, such as waste heat and solar energy, the energy shortage, and global warming issues may be greatly relieved. This review focusses recent developments on the thermoelectric performance of a low-dimensional material, bulk nanostructured materials, conventional bulk materials etc. Particular emphasis is given on, how the nanostructure in nanostructured composites, confinement effects in one-dimensional nanowires and doping effects in conventional bulk composites plays an important role in ZT enhancement.

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“…CoSb 3 has two large voids (2a positions) in the skutterudite crystal structure which support the phonon glass and electron crystal (PGEC) concept [1] by filling the voids. Many researchers have tried to fill the voids with rattlers [2,3] and/or to dope with suitable impurities to reduce thermal conductivity by introducing phonon scattering centers [4][5][6][7][8][9]. In this paper, we have studied the Sn-filling and Te-doping effects on the thermoelectric properties of CoSb 3 skutterudite.…”

Section: Introductionmentioning

confidence: 99%