Nanostructured magnetoceramics from hyperbranched polymer precursors

Qunhui Sun, Kaitian Xu, Jacky W.Y. Lam, John A.K. Cha, Xixiang Zhang, Ben Zhong Tang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

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-Fe2O3 whereas those in the ceramics produced under argon 2A are mainly Fe3Si. When magnetized by an external field at room temperature, 2A exhibits a high saturation magnetization (Ms ~ 49 emu/g) and near-zero remanence and coercivity.

Original languageEnglish (US)
Pages (from-to)107-112
Number of pages6
JournalMaterials Science and Engineering C
Volume16
Issue number1-2
DOIs
StatePublished - Oct 20 2001

Keywords

  • Ceramics
  • Ferromagnetic materials
  • Hyperbranched polymers
  • Nanoclusters
  • Polymer precursors
  • Polysilynes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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