PHASE-RELATIONSHIPS IN THE SYSTEM SI3N4-SIO2-YB2O3

Authors
NISHIMURA T MITOMO M
Citation
T. Nishimura et M. Mitomo, PHASE-RELATIONSHIPS IN THE SYSTEM SI3N4-SIO2-YB2O3, Journal of materials research, 10(2), 1995, pp. 240-242
Citations number
20
Categorie Soggetti
Material Science
Journal title
Journal of materials research → ACNP
ISSN journal
08842914
Volume
10
Issue
2
Year of publication
1995
Pages
240 - 242
Database
ISI
SICI code
0884-2914(1995)10:2<240:PITSS>2.0.ZU;2-0
Abstract
Phase relationships in the system Si3N4-SiO2-Erb(2)O(3) have been inve stigated at 1750 degrees C and compared with those in the system Si3N4 -SiO2-Y2O3 TWO types of ytterbium silicon oxynitride, Yb2Si3O3N4 (tetr agonal) and Yb4Si2O7N2 (monoclinic), were confirmed to exist. The x-ra y powder diffraction data of two compounds were indexed based on the s pace group and unit cells. Melting temperature of Yb4Si2O7N2 was deter mined as 1870 degrees C. Yb4Si2O7N2 is a better intergranular phase of silicon nitride ceramics for its high melting temperature.