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

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Aydemir,  U.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Candolfi,  C.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ormeci,  A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baitinger,  M.
Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Oeschler,  N.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin,  Yu.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-9BCD-4
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.