Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00098 : Gd$_{116}$Co$_{49}$Sn$_{118}$: A Complex Intermetallic Phonon-Glass/Electron-Crystal
Author:
State-of-the art thermoelectric devices today operate at very low
efficiencies and are expensive to produce. However, the growing need for
alternate energy sources based on novel technologies has brought
thermoelectrics to the forefront of applied materials research.
Thermoelectrics could have a significant impact in this area, if their
performance is significantly enhanced to a figure of merit (\textit{ZT}) above 1.5. Our
research focuses on the growth and structure-property relationships of
intermetallics, specifically crystal structures with large lattice
parameters that contain heavy atoms. These materials may be good
thermoelectric candidates due to their potentially low lattice thermal
conductivities and enhanced Seebeck values resulting from polar
intermetallic properties. We have recently grown
Gd$_{116}$Co$_{49}$Sn$_{118}$ (\textit{Fm-3m}, $a \quad \cong $ 30.2 {\AA}), a compound related
to the Dy$_{117}$Co$_{57}$Sn$_{112}$ structure type. Physical property
measurements indicate that this is an ambipolar semiconductor with an
exceptionally low lattice thermal conductivity ($\kappa _{l} \quad \cong $ 0.5
W/m-K). The observed phonon-glass/electron-crystal properties make
Gd$_{116}$Co$_{49}$Sn$_{118}$ and its analogues potential thermoelectric
candidates.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.98
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