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How cerium filling fraction influences thermal factors and magnetism in CeyFe4-xNixSb12.

Published online by Cambridge University Press:  01 February 2011

L. Chapon ,
D. Ravot ,
J.C. Tedenac  and
F. Bouree-Vigneron
L. Chapon
Affiliation:
LPMC, Université Montpellier II, 34090 Montpellier, France
D. Ravot
Affiliation:
LPMC, Université Montpellier II, 34090 Montpellier, France
J.C. Tedenac
Affiliation:
LPMC, Université Montpellier II, 34090 Montpellier, France
F. Bouree-Vigneron
Affiliation:
LLB-CEA-Saclay, 91000 Gif sur Yvette, France
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Extract

Since few years, cerium filled and partially filled skutterudites are intensively studied because they show a wide variety of fundamental and applied properties. One of them consists in high values of thermal factors for rare earth atom in antimony skutterudites [1,2]. Slack suggests [3,4] a incoherent rattling of this ion in the oversized cage “Sb12” surrounding the cerium which affects highly the phonon motion and thus lowers the lattice thermal conductivity (kl). As a rule, the lattice thermal conductivity is decreased by a factor of 5 or greater by filling entirely the voids of the binary filled skutterudites with rare earth atoms [5]. Besides, kl decreases for partially filled compounds in respect with totally filled ones [6,7]. Mass fluctuation mechanism between cerium atom and vacancy is obviously involved as the origin of this last reduction. On that purpose, theoretical calculations [7] demonstrate that the reduction belonging to mass fluctuation mechanism is an order of magnitude lower than the measured decrease. As the mass fluctuation added to the “rattling” on the cerium site is not sufficient to explain such low values of thermal conductivity, another phonon scattering mechanism must exist. In order to find another mechanism we present the influence of the filling fraction of cerium on thermal factors and the temperature dependence of this factor for a partially filled compound.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 626: Symposium Z – Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications , 2000 , Z1.2
Copyright
Copyright © Materials Research Society 2000

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References

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