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Rietveld refinements are widely used for many purposes in the physical sciences. Conducting a Rietveld refinement typically requires expert input because correct results may require that parameters be added to the fit in the proper order. This order will depend on the nature of the data and the initial parameter values. A mechanism for computing the next parameter to add to the refinement is shown...
The structure of a new catalytically active MoVTaTeO variant of the M1-phase propane (amm)oxidation catalyst has been refined. This Ta-containing variant is isostructural with the well-known MoVNbTeO form of the M1 phase, in this case with a = 21.1484(9) Å, b = 26.6472(11) Å, c = 4.00332(1) Å with Z = 4. The formula unit of can be written as (TeO)0.43 Mo4.08 V0.70Ta0.22O14 to be compared to the previously...
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