| Autor: |
Jordi Rius, Bernd Marler, Hermann Gies, Carlos Miravitlles, J. Sañé, U. Oberhagemann |
| Rok vydání: |
1995 |
| Předmět: |
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| Zdroj: |
Acta Crystallographica Section A Foundations of Crystallography. 51:840-845 |
| ISSN: |
0108-7673 |
| DOI: |
10.1107/s0108767395005800 |
| Popis: |
The viability of solving the structure type of zeolitic and layered materials applying multisolution direct methods to low-resolution (~2.2 A) 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 A resolution and (b) the hitherto unknown layer silicate RUB-15 (Ibam) at 2.2 A 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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