Magnetoceramics from the Bulk Pyrolysis of Polysilazane Cross-Linked by Polyferrocenylcarbosilanes with Hyperbranched Topology
Abbreviated Journal Title
ACS Appl. Mater. Interfaces
magnetoceramics; polymeric precursors; hyperbranched; cross-linker; POLYMER-DERIVED CERAMICS; MAGNETIC-PROPERTIES; ORGANOMETALLIC POLYMERS; SILICON-CARBIDE; SICN; FIBERS; TEMPERATURE; FABRICATION; COMPOSITES; PRECURSOR; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
In this contribution, we report a novel strategy for the synthesis of nanocrystal-containing magnetoceramics with an ultralow hysteresis loss by the pyrolysis of commercial polysilazane cross-linked with a functional metallopolymer possessing hyperbranched topology. The usage of hyperbranched polyferrocenylcarbosilane offers either enhanced ceramic yield or magnetic functionality of pyrolyzed ceramics. The ceramic yield was enhanced accompanied by a decreased evolution of hydrocarbons and NH3 because of the cross-linking of precursors and the hyperbranched cross-linker. The nucleation of Fe5Si3 from the reaction of iron atoms with Si-C-N amorphous phase promoted the formation of alpha-Si3N4 and SiC crystals. After annealing at 1300 degrees C, stable Fe3Si crystals were generated from the transformation of the metastable Fe5Si3 phase. The nanocrystal-containing ceramics showed good ferromagnetism with an ultralow (close to 0) hysteresis loss. This method is convenient for the generation of tunable functional ceramics using a commercial polymeric precursor cross-linked by a metallopolymer with a designed topology.
Acs Applied Materials & Interfaces
"Magnetoceramics from the Bulk Pyrolysis of Polysilazane Cross-Linked by Polyferrocenylcarbosilanes with Hyperbranched Topology" (2013). Faculty Bibliography 2010s. 4236.