TY - JOUR
T1 - Structure comparison of co-crystallized 6- and 12-sided large cancrinite crystals
AU - Vaughan, David E.W.
AU - Yennawar, Hemant P.
AU - Perrotta, Anthony J.
AU - Benesi, Alan J.
N1 - Funding Information:
We thank Dr. E.A.D. White (deceased), former Director, Crystal Growth Laboratory, Department of Electrical Engineering, Imperial College, London, for the batch of SOD and CAN crystals. This work is supported by the Penn State Materials Research Institute and the Penn State MRSEC under NSF Grant DMR 0820404. We acknowledge NSF Chemistry Research Instrumentation and Facilities Grant CHE-0131112 for the purchase of the Bruker-AXS single crystal X-ray diffractometer.
PY - 2009/7/1
Y1 - 2009/7/1
N2 - 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.
AB - 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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U2 - 10.1016/j.micromeso.2009.04.021
DO - 10.1016/j.micromeso.2009.04.021
M3 - Article
AN - SCOPUS:65749099841
SN - 1387-1811
VL - 123
SP - 274
EP - 279
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-3
ER -