Ba-filled Ni–Sb–Sn based skutterudites with anomalously high lattice thermal conductivity

Paschinger, W.; Rogl, Gerda; Grytsiv, A.; Michor, H.; Heinrich, P. R.; Mueller, H.; Puchegger, S.; Klobes, B.; Hermann, Raphael P.; Reinecker, M.; Eisenmenger-Sitter, Ch.; Broz, P.; Bauer, Ernst; Giester, G.; Zehetbauer, M.; Rogl, Peter F.

doi:10.1039/C6DT01298A

Title: Ba-filled Ni–Sb–Sn based skutterudites with anomalously high lattice thermal conductivity

Journal Article · Tue Jun 21 00:00:00 EDT 2016 · Dalton Transactions

DOI:https://doi.org/10.1039/C6DT01298A· OSTI ID:1302928

Paschinger, W. ^[1]; Rogl, Gerda ^[2]; Grytsiv, A. ^[3]; Michor, H. ^[4]; Heinrich, P. R. ^[4]; Mueller, H. ^[4]; Puchegger, S. ^[1]; Klobes, B. ^[5]; Hermann, Raphael P. ^[6]; Reinecker, M. ^[1]; Eisenmenger-Sitter, Ch. ^[4]; Broz, P. ^[7]; Bauer, Ernst ^[8]; Giester, G. ^[1]; Zehetbauer, M. ^[1]; Rogl, Peter F. ^[9]

Univ. of Vienna (Austria)
Univ. of Vienna (Austria); Christian Doppler Laboratory for Thermoelectricity, Vienna (Austria); Technische Universitat Wien (Vienna University of Technology), Austria
Univ. of Vienna (Austria); Christian Doppler Laboratory for Thermoelectricity, Vienna (Austria);Technische Universitat Wien (Vienna University of Technology), Austria
Technische Universitat Wien (Vienna University of Technology), Austria
Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS)
Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Masaryk University, Brno (Czech Republic)
Christian Doppler Laboratory for Thermoelectricity, Vienna (Austria); Technische Universitat Wien (Vienna University of Technology), Austria
Univ. of Vienna (Austria); Christian Doppler Laboratory for Thermoelectricity, Vienna (Austria)

Here, in this study, novel filled skutterudites Ba_yNi₄Sb_12-xSn_x (y_max = 0.93) have been prepared by arc melting followed by annealing at 250, 350 and 450°C up to 30 days in vacuum-sealed quartz vials. Extension of the homogeneity region, solidus temperatures and structural investigations were performed for the skutterudite phase in the ternary Ni–Sn–Sb and in the quaternary Ba–Ni–Sb–Sn systems. Phase equilibria in the Ni–Sn–Sb system at 450°C were established by means of Electron Probe Microanalysis (EPMA) and X-ray Powder Diffraction (XPD). With rather small cages Ni₄(Sb,Sn)₁₂, the Ba–Ni–Sn–Sb skutterudite system is perfectly suited to study the influence of filler atoms on the phonon thermal conductivity. Single-phase samples with the composition Ni₄Sb_8.2Sn_3.8, Ba_0.42Ni₄Sb_8.2Sn_3.8 and Ba_0.92Ni₄Sb_6.7Sn_5.3 were used to measure their physical properties, i.e. temperature dependent electrical resistivity, Seebeck coefficient and thermal conductivity. The resistivity data demonstrate a crossover from metallic to semiconducting behaviour. The corresponding gap width was extracted from the maxima in the Seebeck coefficient data as a function of temperature. Single crystal X-ray structure analyses at 100, 200 and 300 K revealed the thermal expansion coefficients as well as Einstein and Debye temperatures for Ba_0.73Ni₄Sb_8.1Sn_3.9 and Ba_0.95Ni₄Sb_6.1Sn_5.9. These data were in accordance with the Debye temperatures obtained from the specific heat (4.4 K < T < 140 K) and Mössbauer spectroscopy (10 K < T < 290 K). Rather small atom displacement parameters for the Ba filler atoms indicate a severe reduction in the “rattling behaviour” consistent with the high levels of lattice thermal conductivity. The elastic moduli, collected from Resonant Ultrasonic Spectroscopy ranged from 100 GPa for Ni₄Sb_8.2Sn_3.8 to 116 GPa for Ba_0.92Ni₄Sb_6.7Sn_5.3. The thermal expansion coefficients were 11.8 × 10^-6 K^-1 for Ni₄Sb_8.2Sn_3.8 and 13.8 × 10^-6 K^-1 for Ba_0.92Ni₄Sb_6.7Sn_5.3. The room temperature Vickers hardness values vary within the range from 2.6 GPa to 4.7 GPa. Lastly, severe plastic deformation via high-pressure torsion was used to introduce nanostructuring; however, the physical properties before and after HPT showed no significant effect on the materials thermoelectric behaviour.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1302928

Journal Information:: Dalton Transactions, Vol. 45, Issue 27; ISSN 1477-9226

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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