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Enhancement of thermoelectric performance of ball-milled bismuth due to spark-plasma-sintering-induced interface
Pooja Puneet1, Ramakrishna Podila, Song Zhu
1Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA.
Abstract:
Interface modification in transport properties of single elemental polycrystalline Bi via spark plasma sintering results in 'double-decoupling' (simultaneous decoupling of thermopower, electrical, and thermal conductivity) of otherwise coupled entities. In spark plasma sintering, the DC pulse current helps in controlling the nature and extent of surfaces of ball-milled Bi and hence results in six-fold improvement in the dimensionless figure of merit (ZT) relative to as-purchased samples.
