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Phase Equilibria in the System Si 3 N 4 ‐SiO 2 ‐BeO‐Be 3 N 2
Author(s) -
HUSEBY IRVIN C.,
LUKAS HANS L.,
PETZOW GÜNTER
Publication year - 1975
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.1151-2916.1975.tb19002.x
Subject(s) - isothermal process , solubility , analytical chemistry (journal) , phase (matter) , silicon , crystallography , materials science , chemistry , thermodynamics , physics , metallurgy , organic chemistry , chromatography
The 1780°C isothermal section of the reciprocal quasiternary system Si 3 N 4 ‐SiO 2 ‐BeO‐Be 3 N 2 was investigated by the X‐ray analysis of hot‐pressed samples. The equilibrium relations shown involve previously known compounds and 8 newly found compounds: Be 6 Si 3 N 8 , Be 11 Si 5 N 14 , Be 5 Si 2 N 6 , Be 9 Si 3 N 10 , Be 8 SiO 4 N 4 , Be 6 O 3 N 2 , Be 8 O 5 N 2 , and Be 9 O 6 N 2 . Large solid solubility occurs in β‐Si 3 N 4 , BeSiN 2 , Be 9 Si 3 N 10 , Be 4 SiN 4 , and β‐Be 3 N 2 . Solid solubility in β‐Si 3 N 4 extends toward Be 2 SiO 4 and decreases with increasing temperature from 19 mol% at 1770°C to 11.5 mol% Be 2 SiO 4 at 1880°C. A 4‐phase isotherm, liquid +β‐Si 3 N 4 ( ss )Si 2 ON 2 + BeO, exists at 1770°C.