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Article Dans Une Revue Scientific Reports Année : 2020

Insight into the structural, elastic and electronic properties of a new orthorhombic 6O-SiC polytype

Résumé

Different polytypes of SiC are described and predicted in literature. Here, we report the first occurrence of an orthorhombic 6O-SiC polytype as rock-forming mineral in the nickel laterite mine of Tiebaghi (New Caledonia). This new class of SiC crystallizes in the space group Cmc21 with 12 atoms per unit cell [a = 3.0778(6) Å, b = 5.335(2) Å, c = 15.1219(6) Å, α = 90°, β = 90°, γ = 120°]. The density of 6O-SiC is about 3.22 g/cm3 and the calculated indirect bandgap at room temperature of 3.56 eV is identical to 6H-SiC. Our results suggest that 6O-SiC is the intermediate state in the wurtzite to rocksalt transformation of 6H-SiC.
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hal-02899711 , version 1 (12-03-2021)

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Yassine El Mendili, Beate Orberger, Daniel Chateigner, Jean-François Bardeau, Stéphanie Gascoin, et al.. Insight into the structural, elastic and electronic properties of a new orthorhombic 6O-SiC polytype. Scientific Reports, 2020, 10 (1), pp.7562. ⟨10.1038/s41598-020-64415-4⟩. ⟨hal-02899711⟩
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