An outline of the crystal-structure of Bi2Mo2O9 |
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Authors: | AF van den Elzen GD Rieck |
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Affiliation: | Laboratory of Physical Chemistry, Eindhoven University of Technology, The Netherlands |
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Abstract: | An outline of the structure of the catalyser component Bi2Mo2O9 has been determined from X-ray powder diffractometer diagrams. The space group is () with cell constants: , , and β = 90.15 (2)°. There are eight formula units per cell. The positions of the metal-ions could directly be derived from the intensities of the strongest reflexions. With difference terms calculated from 19 strong reflexions a Δ F-synthesis was calculated, which revealed the approximate positions of the O2?-ions. From packing considerations it was apparent that of 9 02?-ions one is only coordinated by Bi3+ and that Mo6+ must be tetrahedrally surrounded by 02?. These tetrahedra may be strongly distorted. The structure is not related to the scheelite-structure as has been assumed by some authors. |
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