[sdpd] New zeolite

[Armel Le Bail <alb...@cristal.org>]

Hi,

A new zeolite (ITQ22 : Si89.8Ge22.2O224) is always good 
news - generally it is characterized by SDPD ;-)

"A zeolite with interconnected 8-, 10- and 12-ring
pores and its unique catalytic selectivity"
A. Corma, F. Rey, S. Valencia, J.L. Jorda & J. Rius,
Nature Materials 2 (2003) 493-497.

- synchrotron data (LURE - Orsay)

- indexing by DICVOL91 a=42.1326,  b=12.9885, c =12.6814

- integrated intensities extracted by ADJUST (not Pawley)

- S.G. Pbam, direct method by XLENS providing 16 T atoms.;
32 O atoms found by interpolation, refinement by FULLPROF

Comments on this paper in the same journal :
"Porous architectures," A. Burton, 
Nature Materials 2 (2003) 438-440.
"this is the most complex ordered zeolite ever characterized
from powder diffraction data, and from a crystallographic
perspective, it represents a remarkable feat."
But he writes about 16 T and 34 O atoms ... Not 2 O
atoms in excess ??

The problem with Nature Materials is the need to have
good eyes for being able to read some parts of the
articles in font size 6 maybe ;-).

Best regards,

Armel

PS - Nobody to comment the latest issue of J. Appl. Cryst. ?

  


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