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  High temperature thermoelectric properties of the type-I clathrate Ba8NixGe46-x-ysquarey

Aydemir, U., Candolfi, C., Ormeci, A., Baitinger, M., Oeschler, N., Steglich, F., et al. (2014). High temperature thermoelectric properties of the type-I clathrate Ba8NixGe46-x-ysquarey. Journal of Physics: Condensed Matter, 26(48): 485801, pp. 1-9. doi:10.1088/0953-8984/26/48/485801.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-9BCD-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-7F55-5
Genre: Journal Article

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 Creators:
Aydemir, U.1, Author              
Candolfi, C.2, Author              
Ormeci, A.1, Author              
Baitinger, M.3, Author              
Oeschler, N.2, Author              
Steglich, F.4, Author              
Grin, Yu.5, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
3Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863416              
4Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              
5Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: Polycrystalline samples of the type-I clathrate Ba8NixGe46-x-y square(y) were synthesized for 0.2 <= x <= 3.5 by melt quenching and for 3.5 < x <= 6.0 by melting with subsequent annealing at 700 degrees C. The maximum Ni content in the clathrate framework at this temperature was found to be x approximate to 4.2 atoms per unit cell. Thermoelectric and thermodynamic properties of the type-I clathrate were investigated from 300 to 700 K by means of electrical resistivity, thermopower, thermal conductivity and specific heat measurements. As the Ni content increases, the electronic properties gradually evolve from a metallic character (x < 3.5) towards a highly doped semiconducting state (x >= 3.5). Below x approximate to 4.0 transport is dominated by electrons, while further addition of Ni (x approximate to 4.2) switches the electrical conduction to p-type. Maximum value of the dimensionless thermoelectric figure of merit ZT approximate to 0.2 was achieved at 500K and 650K for x approximate to 2.0 and x approximate to 3.8, respectively.

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Language(s): eng - English
 Dates: 2014-11-06
 Publication Status: Published in print
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Title: Journal of Physics: Condensed Matter
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 26 (48) Sequence Number: 485801 Start / End Page: 1 - 9 Identifier: ISSN: 0953-8984
CoNE: /journals/resource/954928562478