Magnetoceramics from the Bulk Pyrolysis of Polysilazane Cross-Linked by Polyferrocenylcarbosilanes with Hyperbranched Topology

    Authors

    J. Kong; M. M. Kong; X. F. Zhang; L. X. Chen;L. N. An

    Comments

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    Abbreviated Journal Title

    ACS Appl. Mater. Interfaces

    Keywords

    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

    Abstract

    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.

    Journal Title

    Acs Applied Materials & Interfaces

    Volume

    5

    Issue/Number

    20

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    10367

    Last Page

    10375

    WOS Identifier

    WOS:000326212900069

    ISSN

    1944-8244

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