Single-crystal polarized FTIR spectroscopy and neutron diffraction refinement of cancrinite.
Articolo
Data di Pubblicazione:
2009
Citazione:
Single-crystal polarized FTIR spectroscopy and neutron diffraction refinement of cancrinite / G. Della Ventura , G.D. Gatta , G.J. Redhammer , F. Bellatreccia , A. Loose , G.C. Parodi. - In: PHYSICS AND CHEMISTRY OF MINERALS. - ISSN 0342-1791. - 36:4(2009 Apr), pp. 193-206. [10.1007/s00269-008-0269-8]
Abstract:
We relate a single-crystal FTIR (Fourier
transform infrared) and neutron diffraction study of two natural cancrinites. The structural refinements show that
the oxygen site of the H2O molecule lies off the triad axis.
The water molecule is almost symmetric and slightly tilted
from the (0001) plane. It is involved in bifurcated hydrogen
bridges, with Ow...O donor–acceptor distances [2.7 Aengstr .
The FTIR spectra show two main absorptions. The first at
3,602 cm-1 is polarized for E perp. c and is assigned to the v3
mode. The second, at 3,531 cm-1, is also polarized for
E perp. c and is assigned to v1 mode. A weak component at
4,108 cm-1 could possibly indicate the presence of additional
OH groups in the structure of cancrinite. Several
overlapping bands in the 1,300–1,500 cm-1 range are
strongly polarized for E perp. c, and are assigned to the
vibrations of the CO3 group.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Cancrinite, Polarized FTIR ,
Neutron diffraction , Crystal-structure refinement ,
H2O bonding system
Elenco autori:
G. Della Ventura, G.D. Gatta, G.J. Redhammer, F. Bellatreccia, A. Loose, G.C. Parodi
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