Skip to main content Accessibility help
×
Home

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

  • L. Chapon (a1), D. Ravot (a1), J.C. Tedenac (a1) and F. Bouree-Vigneron (a2)

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.

Copyright

References

Hide All
[1] Chakoumakos, B. C., Sales, B.C., Mandrus, D., Keppens, V., Act. Cryst. (1999). B55, 341
[2] Sales, B. C., Chakoumakos, B. C., Mandrus, D., Phys. Rev. B (2000). 61(4), 2475
[3] Slack, G. A., Tsoukala, V. G., J. Appl. Phys. (1994). 76, 1665
[4] Slack, G. A., in Thermoelectric Handbook, edited by Rowe, D. M. (CRC, Boca Raton, FL, 1995), 407.
[5] Nolas, G. S., Slack, G. A., Morelli, D.T., Tritt, T.M., Erlich, A.C., J. Appl. Phys. (1996). 79(8), 4002.
[6] Meisner, G. P., Morelli, D. T., Hu, S., Yang, J., Uher, C., Phys. Rev. Letters (1998). 80(16), 3551.
[7] Nolas, G. S., Cohn, J. L., Slack, G. A., Phys. Rev. B (1998). 58(1), 164.
[8] Gajewski, D. A. & al., J. Phys. Condens. Matter (1998). 10, 6973.
[9] Chapon, L., Ravot, D., Tedenac, J. C., J. Alloys and Compounds (1999). 282, 58.
[10] Housley, R. M., Hess, F., Phys. Rev. (1966). 146, 517.
[11] Chapon, L., Ravot, D., Tedenac, J.C., J. Alloys and Compounds (2000). 299, 68.
[12] Stewart, G. R., Rev. Mod. Phys. (1984). 56, 755.
[13] Chen, B. & al., Phys. Rev. B,(1997). 55(3), 1476.
[14] Lee, C. H. & al., Phys. Rev. B (1999). 60(19), 13253.

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

  • L. Chapon (a1), D. Ravot (a1), J.C. Tedenac (a1) and F. Bouree-Vigneron (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed