Atomic-scale assessment of the crystallization onset in silicon carbonitride

Gabriela Mera, Ryo Ishikawa, Emanuel Ionescu, Yuichi Ikuhara, Ralf Riedel

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Within the present study, atomic-scale electron microscopy investigation on the crystallization behavior of polysilylcarbodiimide-derived SiCN was performed. The as-prepared SiCN sample was found to be homogeneous and consisted of amorphous silicon nitride nano-domains dispersed within an amorphous, highly entangled graphene-like carbon matrix. Annealing of the sample at 1400°C induced a slight increase of the ordering of the carbon phase. Additionally, the crystallization onset of the silicon nitride has been observed for the first time. In the sample annealed at 1400°C small nano-clusters with average sizes of 0.8, 1.5 and 2.1nm (consisting of 30, 180 and 570 atoms, respectively; corresponding to Si12N18, Si72N108 and Si228N342) were imaged and assigned to α-silicon nitride. The crystallization of the amorphous silicon nitride phase into α-Si3N4 is thought to occur via diffusion of Si and N, which rely on the presence of large number of dangling bonds in the amorphous SiCN sample.

    Original languageEnglish
    Pages (from-to)3355-3362
    Number of pages8
    JournalJournal of the European Ceramic Society
    Volume35
    Issue number12
    DOIs
    Publication statusPublished - 2015 Oct 1

    Keywords

    • Atomic-resolution STEM
    • EELS
    • Phase separation
    • Polymer-derived ceramics
    • Silicon carbonitride

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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