Premium
Synthesis and growth mechanism of single crystal β‐Si 3 N 4 particles with a quasi‐spherical morphology
Author(s) -
Sun SiYuan,
Ge YiYao,
Wang Qi,
Tian ZhaoBo,
Zhang Jie,
Cui Wei,
Liu Guanghua,
Chen KeXin
Publication year - 2018
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/jace.15710
Subject(s) - x ray photoelectron spectroscopy , materials science , amorphous solid , transmission electron microscopy , dispersity , morphology (biology) , single crystal , scanning electron microscope , chemical engineering , crystal (programming language) , spectroscopy , crystallography , analytical chemistry (journal) , nanotechnology , composite material , chemistry , polymer chemistry , organic chemistry , programming language , physics , quantum mechanics , biology , computer science , engineering , genetics
Single‐crystal β‐Si 3 N 4 particles with a quasi‐spherical morphology were synthesized via an efficient carbothermal reduction‐nitridation (CRN) strategy. The β‐Si 3 N 4 particles synthesized under an N 2 pressure of 0.3 MPa, at 1450°C and with 10 mol% unique CaF 2 additives showed good dispersity and an average size of about 650 nm. X‐ray photoelectron spectroscopy analysis revealed that there was no SiC or Si–C–N compounds in the β‐Si 3 N 4 products. Selected‐area electron‐diffraction pattern and high‐resolution image indicated single crystalline structure of the typical β‐Si 3 N 4 particles without an obvious amorphous oxidation layer on the surface. The growth mechanism of the quasi‐spherical β‐Si 3 N 4 particles was proposed based on the transmission electron microscopy and energy dispersive X‐ray spectroscopy characterization, which was helpful for controllable synthesis of β‐Si 3 N 4 particles by CRN method. Owing to the quasi‐spherical morphology, good dispersity, high purity, and single‐crystal structure, the submicro‐sized β‐Si 3 N 4 particles were promising fillers for preparing resin‐based composites with high thermal conductivity.