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Effect of Composition on Crystallization of Y/Yb–Si–Al–O–N B‐Phase Glasses
Author(s) -
Menke Y.,
Hampshire S.,
Falk L. K. L.
Publication year - 2007
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.1551-2916.2007.01580.x
Subject(s) - yttrium , ytterbium , crystallization , materials science , phase (matter) , transmission electron microscopy , analytical chemistry (journal) , mineralogy , chemical engineering , chemistry , doping , metallurgy , oxide , nanotechnology , optoelectronics , organic chemistry , chromatography , engineering
The effect of a partial or full replacement of yttrium by ytterbium on the crystallization of an oxynitride B‐phase parent glass with composition (e/o) 35Y/Yb:45Si:20Al:83O:17N has been investigated by thermal analysis, X‐ray diffractometry and analytical transmission electron microscopy. Single B‐phase formation was extended to higher temperatures by low ytterbium:yttrium ratios, while a full replacement resulted in a two‐phase B‐ and J‐phase glass–ceramic. The B‐phase crystals took up a substantial range of composition that was dependent on the substitution level, and yttrium/ytterbium was always clearly anti‐correlated with silicon. Some aluminum was accommodated in the dendritic J‐phase crystals, and their yttrium/ytterbium content varied between 64 and 79 cation%.