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Anisotropic layered Bi 2 Te 3 -In 2 Te 3 composites: control of interface density for tuning of thermoelectric properties.
- Source :
-
Scientific reports [Sci Rep] 2017 Mar 08; Vol. 7, pp. 43611. Date of Electronic Publication: 2017 Mar 08. - Publication Year :
- 2017
-
Abstract
- Layered (Bi <subscript>1-x</subscript> In <subscript>x</subscript> ) <subscript>2</subscript> Te <subscript>3</subscript> -In <subscript>2</subscript> Te <subscript>3</subscript> (x = 0.075) composites of pronounced anisotropy in structure and thermoelectric properties were produced by zone melting and subsequent coherent precipitation of In <subscript>2</subscript> Te <subscript>3</subscript> from a (Bi <subscript>1-x</subscript> In <subscript>x</subscript> ) <subscript>2</subscript> Te <subscript>3</subscript> (x > 0.075) matrix. Employing solid state phase transformation, the Bi <subscript>2</subscript> Te <subscript>3</subscript> /In <subscript>2</subscript> Te <subscript>3</subscript> interface density was tuned by modifying the driving force for In <subscript>2</subscript> Te <subscript>3</subscript> precipitation. The structure-property relationship in this strongly anisotropic material is characterized thoroughly and systematically for the first time. Unexpectedly, with increasing Bi <subscript>2</subscript> Te <subscript>3</subscript> /In <subscript>2</subscript> Te <subscript>3</subscript> interface density, an increase in electrical conductivity and a decrease in the absolute Seebeck coefficient were found. This is likely to be due to electron accumulation layers at the Bi <subscript>2</subscript> Te <subscript>3</subscript> /In <subscript>2</subscript> Te <subscript>3</subscript> interfaces and the interplay of bipolar transport in Bi <subscript>2</subscript> Te <subscript>3</subscript> . Significantly improved thermoelectric properties of Bi <subscript>2</subscript> Te <subscript>3</subscript> -In <subscript>2</subscript> Te <subscript>3</subscript> composites as compared to the single phase (Bi <subscript>1-x</subscript> In <subscript>x</subscript> ) <subscript>2</subscript> Te <subscript>3</subscript> solid solution are obtained.
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 7
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 28272541
- Full Text :
- https://doi.org/10.1038/srep43611