ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The viability of solving the structure type of zeolitic and layered materials applying multisolution direct methods to low-resolution (2̃.2 Å) powder diffraction data is shown. The phases are refined with the tangent formula derived from Patterson-function arguments [Rius (1993). Acta Cryst. A49, 406–409] and the correct phase sets are discriminated with the conventional figures of merit. The two test examples presented are (a) the already known tetragonal zeolite ZSM-11 (space group 1{\bar 4}m2) at 2.3 Å resolution and (b) the hitherto unknown layer silicate RUB-15 (Ibam) at 2.2 Å resolution. In both cases, the tetrahedral Si units appear as resolved peaks in the Fourier maps computed with the phases of the highest-ranked direct-methods solutions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108767395005800
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