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Crystallization of a Rare Earth‐Rich Aluminoborosilicate Glass With Varying CaO/Na 2 O Ratio
Author(s) -
Quintas Arnaud,
Majérus Odile,
Caurant Daniel,
Dussossoy JeanLuc,
Vermaut Philippe
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.1551-2916.2006.01455.x
Subject(s) - crystallization , nucleation , silicate , apatite , solubility , materials science , mineralogy , phase (matter) , wollastonite , rare earth , analytical chemistry (journal) , chemical engineering , nuclear chemistry , chemistry , chromatography , raw material , organic chemistry , engineering
The effect of varying R =[CaO]/([CaO]+[Na 2 O]) ratio on the crystallization of a rare earth‐rich aluminoborosilicate glass (16 wt% RE 2 O 3 , RE=Nd or La) is investigated. The crystallization of a silicate apatite with Ca 2+ x RE 8− x (SiO 4 ) 6 O 2−0.5 x composition ( x ≈0.4–0.7), is responsible for a drop of the rare earth solubility in the melt. When successive nucleation and growth stages are performed, crystallization processes change across the glass series as a consequence of glass‐in‐glass phase separation. An exotic phase of composition close to Ca 10 Nd 7 Si 20.75 O 62 grows at the expense of silicate apatite.