Anomalous barium filling fraction and n-type thermoelectric performance of BayCo4Sb12
Top Cited Papers
- 15 August 2001
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 90 (4) , 1864-1868
- https://doi.org/10.1063/1.1388162
Abstract
Barium-filled skutterudites BayCo4Sb12 with an anomalously large filling fraction of up to y=0.44 have been synthesized. The lattice parameters increase linearly with Ba content. Magnetic susceptibility data show that Ba0.44Co4Sb12 is paramagnetic, which implies that some of the Co atoms in BayCo4Sb12 have acquired a magnetic moment. The presence of the two different valence states of Co (Co3+ and Co2+) leads to the anomalously large barium filling fraction even without extra charge compensation. All samples show n-type conduction. The electrical conductivity increases with increasing the Ba filling fraction. The lattice thermal conductivity of BayCo4Sb12 is significantly depressed as compared to unfilled Co4Sb12. The dimensionless thermoelectric figure of merit, ZT, increases with increasing temperature reaching a maximum value of 1.1 for Ba0.24Co4Sb12 at 850 K.Keywords
This publication has 23 references indexed in Scilit:
- Thermoelectric properties of chemically substituted skutterudites YbyCo4SnxSb12−xJournal of Applied Physics, 2000
- Solid state reaction synthesis of filled skutterudite compounds (Ce or Y)yFexCo4-xSb12 and the effect of filling atoms Ce or Y on lattice thermal conductivityScience in China Series B Chemistry, 2000
- The antimony-rich parts of the ternary systems calcium, strontium, barium and cerium with iron and antimony; structure refinements of the LaFe4Sb12-type compounds SrFe4Sb12 and CeFe4Sb12; the new compounds CaOs4Sb12 and YbOs4Sb12Journal of Alloys and Compounds, 1999
- Disparate atomic displacements in skutterudite-type LaFe3CoSb12, a model for thermoelectric behaviorActa crystallographica Section B, Structural science, crystal engineering and materials, 1999
- Thermoelectric Properties of CeyFexCo4−xSb12 Prepared by a Solid State ReactionJournal of the Japan Institute of Metals and Materials, 1999
- Effect of partial void filling on the lattice thermal conductivity of skutteruditesPhysical Review B, 1998
- Structure and Lattice Thermal Conductivity of Fractionally Filled Skutterudites: Solid Solutions of Fully Filled and Unfilled End MembersPhysical Review Letters, 1998
- Filled skutterudite antimonides: Electron crystals and phonon glassesPhysical Review B, 1997
- Low-temperature transport properties of the filled skutterudites sPhysical Review B, 1997
- Filled Skutterudite Antimonides: A New Class of Thermoelectric MaterialsScience, 1996