Abstract
This paper presents the results of synthesizing rod-like β-Si 3N 4 crystals by combustion synthesis (CS) with six rare-earth oxides (Y 2O 3, La 2O 3, CeO 2, Sm 2O 3, Gd 2O 3 and Yb 2O 3) as additives under high nitrogen pressure. The effect of rare-earth oxide additives on the final morphology of rod-like β-Si 3N 4 was investigated and the crystal growth mechanism was discussed in detail. The results reveal that the final morphology of combustion synthesized Si 3N 4 is strongly dependent on the viscosity of liquid formed by the rare-earth oxide and the SiO 2 on the Si powder surface. With the increasing of atomic number of the rare-earth elements, the final morphology is from elongated rod-like crystals to short columnar crystals.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
