Crystallization of stoichiometric KAlSi3O8, RbAlSi3O8, and CsAlSi3O8 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 (KAlSi2O6), a Rb analogue of leucite (RbAlSi2O3), and pollucite (CsAlSi2O6), respectively. The KAlSi3O8 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 KAlSi3O8 glasses and single‐phase gels did not change upon seeding with isostructural feldspar crystals. No significant crystallization effects were detected with the use of RbAlSi3O8 and CsAlSi3O8 multiphasic gels. However, K‐feldspar (sanidine) was crystallized by using both compositionally and structurally different gels of KAlSi3O8, i.e., multiphasic gels seeded With feldspar crystals. The microstructure of oriented sanidine crystals around the seeds indicated an epitaxial crystallization mechanism.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of the American Ceramic Society|
|State||Published - Dec 1994|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry