What is the meaning of Warning Eclectic-view-ratio is TOO LOW (<4)? If there is no constraint could your intensity-affecting parameters be inaccurate?

13 February 2015 1 3K Report

During the refinement after varying some parameters warnings show in the SUM file of FULLPROF. What is meaning of this warning? Can you suggest what I should do?

Daniel M. Többens

There are too many refinable parameters in the model in relation to the number of Bragg peaks. This leads to true uncertainties of the results, which far exceed the uncertainties estimated by the least-squares algorithm. Fullprof uses (Effective Number of reflections considering resolution) / (Number of Bragg-peak-intensity-influencing parameters) to estimate this.

You could increase experimentally the number of Bragg peaks with higher resolution, larger angular range or shorter wavelength. Or reduce the number of parameters by fixing some to values known from other methods, simplifying the model of using geometry constraints.

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