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Sintering behavior of Ba/Sr celsian precursor obtained from zeolite‐A by ion‐exchange method
Author(s) -
Biesuz Mattia,
Spiridigliozzi Luca,
Marocco Antonello,
Dell'Agli Gianfranco,
Sglavo Vincenzo M.,
Pansini Michele
Publication year - 2017
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/jace.15117
Subject(s) - sintering , materials science , monoclinic crystal system , amorphous solid , crystallization , zeolite , atmospheric temperature range , phase (matter) , ion exchange , chemical engineering , mineralogy , thermal treatment , ion , analytical chemistry (journal) , composite material , crystal structure , crystallography , chemistry , thermodynamics , catalysis , chromatography , engineering , biochemistry , organic chemistry , physics
(Ba, Sr)‐exchanged zeolite A with composition Ba 0.74 Sr 0.22 Na 0.04 Al 2 Si 2 O 8 was prepared by cation exchange; a mild thermal treatment converts into an amorphous phase. Successive crystallization and sintering behavior was studied by XRD , DTA , and thermodilatometric analysis. The results point out the activation of viscous flow sintering mechanisms between 900°C and 1050°C. The densification process starts when the amorphous phase reaches its glass transition temperature (897°C) and finishes when the material crystallizes forming hexacelsian. The application of an external pressure in such temperature range allows to achieve an almost complete densification, the material transforming at 1300°C into dense monoclinic celsian much below the typical processing temperature.
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