Abstract
Controlled pyrolysis of a hyperbranched polysilyne, poly[1,1′-ferrocenylene(methyl)silyne] ( 1), at high temperature in inert atmosphere produces nonostructured ceramics ( 2) in ∼48–62% yields. The ceramic products 2 are characterized by SEM, XPS, EDX, XRD, and SQUID. It is found that the ceramics are electrically conductive and possess a mesoporous architecture. The iron contents of 2 estimated by EDX are 36–43%. The nanocrystals formed in the ceramics produced under nitrogen 2N are mainly α-Fe 2O 3 whereas those in the ceramics produced under argon 2A are mainly Fe 3Si. When magnetized by an external field at room temperature, 2A exhibits a high saturation magnetization ( M s∼49 emu/g) and near-zero remanence and coercivity.
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