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Seeding Effects on Crystallization of KAlSi 3 O 8 , RbAlSi 3 O 8 , and CsAlSi 3 O 8 Gels and Glasses
Author(s) -
Liu Chunling,
Komarneni Sridhar,
Roy Rustum
Publication year - 1994
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.1151-2916.1994.tb04556.x
Subject(s) - leucite , crystallization , sanidine , materials science , feldspar , scanning electron microscope , mineralogy , phase (matter) , crystallography , analytical chemistry (journal) , chemical engineering , chemistry , composite material , chromatography , plagioclase , ceramic , quartz , organic chemistry , engineering
Crystallization of stoichiometric KAlSi 3 O 8 , RbAlSi 3 O 8 , and CsAlSi 3 O 8 gels (single‐phase and multiphasic gels) and glasses with and without seeding has been investigated by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometry (EDS). The pure gels of K‐, Rb‐, and Cs‐feldspar compositions crystallized mainly to leucite (KAlSi 2 O 6 ), a Rb analogue of leucite (RbAlSi 2 O 3 ), and pollucite (CsAlSi 2 O 6 ), respectively. The KAlSi 3 O 8 glass also yielded leucite. No feldspar phases crystallized in the temperature region studied. The leucite crystallization temperature was lowered by using multiphasic gels. The crystallization sequence of the KAlSi 3 O 8 glasses and single‐phase gels did not change upon seeding with isostructural feldspar crystals. No significant crystallization effects were detected with the use of RbAlSi 3 O 8 and CsAlSi 3 O 8 multiphasic gels. However, K‐feldspar (sanidine) was crystallized by using both compositionally and structurally different gels of KAlSi 3 O 8 , i.e., multiphasic gels seeded With feldspar crystals. The microstructure of oriented sanidine crystals around the seeds indicated an epitaxial crystallization mechanism.