Reaction of CaSi2 and FeCl2 with additional NaCl to synthesis of beta-FeSi2/Si composites br

Abstract

This work studied the impact of the molar ratio of CaSi2 and FeCl2 and additional NaCl under Ar atmosphere on the formation of beta-FeSi2/Si composites. Phase and microstructure of silicide were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The results indicate that the formation of beta-FeSi2 was favored in the sample with a molar ratio of CaSi2/FeCl2 higher than 1 while beta-FeSi2 was not generated in the sample with a molar ratio of CaSi2/FeCl2 equal to 1. beta-FeSi2/Si composites, beta-FeSi2 growing on the surface of Si nanosheet bundles and the surface of Si nanosheets, were formed in the sample with a 1:0.5:2.2 molar ratio of CaSi2, FeCl2, and NaCl. (c) 2022 The Ceramic Society of Japan. All rights reserved.