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Yttrium Oxide‐Assisted CRN Synthesis of Silicon Oxynitride Powders with Controlled Morphology
Author(s) -
Zhou Yao,
Liu Qian,
Zhou Hu,
Zhuang Jiandong
Publication year - 2013
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.12579
Subject(s) - eutectic system , carbothermic reaction , materials science , mesoporous material , chemical engineering , carbon fibers , composite number , yttrium , silicon , morphology (biology) , mesoporous silica , phase (matter) , oxide , catalysis , metallurgy , microstructure , composite material , chemistry , organic chemistry , biology , engineering , genetics , carbide
Si 2 N 2 O powders were synthesized at low temperatures by a Y 2 O 3 ‐assisted‐carbothermal reduction nitridation ( CRN ) with mesoporous silica/carbon composite as raw material. Experimental results showed that with the addition of Y 2 O 3 , the CRN reaction temperature decreased from 1380°C to 1250°C. The mechanism for Y 2 O 3 reducing the CRN temperature was discussed in detail. It was found that the occurrence of Si 2 N 2 O at low temperatures was due to the formation of an eutectic intermediate phase as Y 2 SiO 5 , which was the reaction product of Y 2 O 3 and mesoporous SiO 2 . In addition, spherical and rod‐like Si 2 N 2 O powders were found to be readily obtained by selecting the mesoporous silica/carbon composite precursors with mesoporous silica spheres and rod‐like SBA ‐15, respectively.