Structure comparison of co-crystallized 6- and 12-sided large cancrinite crystals
Single crystals of hexagonal and dihexagonal morphology cancrinites, crystallized in the same batch reaction with sodalite, have been characterized by X-ray diffraction analysis. Although the unit cell values are almost identical, Si–O bond lengths are greater for the di-hexagonal form (1.650 Å vs....
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Veröffentlicht in: | Microporous and mesoporous materials 2009-07, Vol.123 (1), p.274-279 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Single crystals of hexagonal and dihexagonal morphology cancrinites, crystallized in the same batch reaction with sodalite, have been characterized by X-ray diffraction analysis. Although the unit cell values are almost identical, Si–O bond lengths are greater for the di-hexagonal form (1.650
Å vs. 1.624
Å) and the Al–O bond lengths are shorter (1.710
Å vs. 1.724
Å), possibly indicating greater T-site Si–Al disorder in the di-hexagonal form.
27Al–MASNMR also indicates that the hexagonal form contains minor occluded
Al
(
OH
)
4
-
ions (as does the co-crystallized sodalite). In addition to forming homogeneous single crystals, the di-hexagonal form frequently occurs as an overgrowth on hexagonal crystals, indicating that it results from a secondary crystallization, possibly coincident with the dissolution of sodalite coincident with the final phase of fractional crystallization. |
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ISSN: | 1387-1811 1873-3093 |
DOI: | 10.1016/j.micromeso.2009.04.021 |