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Journal Articles Crystals Year : 2023

Reactive Spark Plasma Sintering and Thermoelectric Properties of Zintl Semiconducting Ca14Si19 Compound

Abstract

We present a new reactive spark plasma sintering (RSPS) technique for synthesizing the rhombohedral Ca14Si19 phase. The RSPS approach reduces the synthesis time from several weeks to a few minutes. The RSPS was found to be sufficient for obtaining a high level of purity of the Ca14Si19 under a pressure of 100 MPa for a dwell period of 5 min at a temperature of 900 ∘C. From electrical resistivity measurements, we were able to determine the energy band gap of Ca14Si19 to Eg=0.145(15) eV. The Seebeck coefficient shows Ca14Si19 as a p-type semiconductor at room temperature. It becomes n-type with increasing temperature pointing to significant bipolar and conduction band contributions due to the narrow bandgap of the compound.
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Dates and versions

hal-03989758 , version 1 (15-02-2023)

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Doaa Omar A. Ali, Marco Fabbiani, Loïc Coulomb, Simon Bosc, Benjamin Villeroy, et al.. Reactive Spark Plasma Sintering and Thermoelectric Properties of Zintl Semiconducting Ca14Si19 Compound. Crystals, 2023, 13 (2), pp.262. ⟨10.3390/cryst13020262⟩. ⟨hal-03989758⟩
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