Abstract
Polycrystalline Si powder consisting of micro-porous particles was prepared by heating Mg2Si powder at 600°C for 40h under a pressure of 500Pa. The porous Si particles were composed of primary Si crystals ranging in size from 100nm to 5μm with pores less than 10μm in size. Porous Si particles with similar morphology were also prepared at 700°C for 50Pa and 500Pa for 10h. The formation of the porous Si particles was attributed to Mg evaporation from Mg2Si particles, followed by crystallization of Si.
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