Title

Magnetoceramics From The Bulk Pyrolysis Of Polysilazane Cross-Linked By Polyferrocenylcarbosilanes With Hyperbranched Topology

Keywords

cross-linker; hyperbranched; magnetoceramics; polymeric precursors

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 α-Si3N4 and SiC crystals. After annealing at 1300 C, stable Fe3Si crystals were generated from the transformation of the metastable Fe5Si 3 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. © 2013 American Chemical Society.

Publication Date

10-23-2013

Publication Title

ACS Applied Materials and Interfaces

Volume

5

Issue

20

Number of Pages

10367-10375

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/am403464e

Socpus ID

84886785699 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84886785699

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