Carbothermal synthesis of micron-sized, uniform, spherical silicon carbide (SiC) particles

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Feller, Tanja ; Rosenfeldt, Sabine ; Retsch, Markus:
Carbothermal synthesis of micron-sized, uniform, spherical silicon carbide (SiC) particles.
In: Zeitschrift für anorganische und allgemeine Chemie. Vol. 647 (2021) Issue 22 . - pp. 2172-2180.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.202100209

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Silicon carbide (SiC) particles are exciting structures because of their hardness, chemical inertness, and dielectric properties. In particular, their absorption/emission properties in the mid-infrared range render them suitable structures for ambient temperature thermal emitters. However, the synthesis of uniform, spherical structures is still challenging. Here, we present a robust synthesis procedure based on carbothermal reduction of silica precursor particles. With an isotropic shrinkage of ∼30 %, the spherical particle shape and uniformity are retained. Furthermore, we outline the influence of the gas atmosphere during the carbothermal treatment and demonstrate the successful conversion to SiC by electron microscopy, X-ray diffraction, thermal and optical analysis.