Where can I find the ICSD Card for H2Ti2O5.xH2O or related structures?
As I wrote earlier, the structure of titanium acid H2Ti2O5.xH2O does not exist in ICSD, only monoclinic mineral structures like CaTi2O5.H2O (Cafetite) CaTi2O4.(OH)2 (Kassite) and CeTi2O5.OH (Lucasite). Searches for H2Ti2O5 on Google found references to H2Ti2O5 nanosheets and H2Ti2O5.xH2O nano-tubes, but no structural information.
These Ti2O5 mineral structures consist of sheets of Ti2O5 octahedra eg click on the formula of:
http://icsd.ill.fr/icsd/index.php?action=""> to see the structure. So I would guess that H2Ti2O5.xH2O might consist of Ti2O5 sheets hydrogen bonded together. For an X-ray structure (no hydrogen scattering) the Kassite structure may serve as a basis for a model if you can understand the cell constants of H2Ti2O5.xH2O in terms of planar Ti2O5 sheets.
I too would be interested if some-one knows more about these interesting Ti2O5 sheet-structures (other than what is in ICSD :-) )
Alan.
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Dr Alan Hewat, ILL Grenoble,
FRANCE<[EMAIL PROTECTED]>fax+33.476.20.76.48
+33.476.20.72.13 (.26 Mme Guillermet)
http://www.ill.fr/dif/people/hewat/
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