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Low‐Temperature Synthesis of Nanocrystalline α‐Si 3 N 4 Powders by the Reaction of Mg 2 Si with NH 4 Cl
Author(s) -
Gu Yunle,
Chen Luyang,
Qian Yitai
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01810.x
Subject(s) - nanocrystalline material , crystallite , x ray photoelectron spectroscopy , transmission electron microscopy , analytical chemistry (journal) , autoclave , lattice constant , materials science , atmospheric temperature range , crystallography , yield (engineering) , diffraction , scanning electron microscope , x ray crystallography , chemistry , chemical engineering , nanotechnology , metallurgy , physics , optics , engineering , composite material , chromatography , meteorology
Nanocrystalline α‐Si 3 N 4 powders have been prepared with a yield of 93% by the reaction of Mg 2 Si with NH 4 Cl 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‐Si 3 N 4 with the lattice constants a = 7.770 and c = 5.627 Å. X‐ray photoelectron spectroscopy analysis indicates that the composition of the α‐Si 3 N 4 samples has a Si:N ratio of 0.756. Transmission electron microscopy images show that the α‐Si 3 N 4 crystallites prepared at 450°, 500°, and 550°C are particles of about 20, 40, and 70 nm in average, respectively.