Low-temperature synthesis of nanocrystalline α-Si3N4 powders by the reaction of Mg2Si with NH4Cl

Yunle Gu, Luyang Chen, Yitai Qian

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    13 Citations (Scopus)

    Abstract

    Nanocrystalline α-Si3N4 powders have been prepared with a yield of 93% by the reaction of Mg2Si with NH4Cl in the temperature range of 450° to 600°C in an autoclave. X-ray diffraction patterns of the products can be indexed as the α-Si3N4 with the lattice constants a = 7.770 and c = 5.627 Å. X-ray photoelectron spectroscopy analysis indicates that the composition of the α-Si3N4 samples has a Si:N ratio of 0.756. Transmission electron microscopy images show that the α-Si3N4 crystallites prepared at 450°, 500°, and 550°C are particles of about 20, 40, and 70 nm in average, respectively.

    Original languageEnglish
    Pages (from-to)1810-1813
    Number of pages4
    JournalJournal of the American Ceramic Society
    Volume87
    Issue number9
    DOIs
    Publication statusPublished - 2004 Sep

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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