If you think it’s plausible that the crystal is expanded or contracted isotropically and homogeneously, then it’s a model worth trying. It’s usually my first model for fitting just about any crystalline material. Often, the resulting fits are not good, and then I have to try other models. But sometimes, particularly when the differences from my model structure are small, it works fairly well.

In terms of the criteria I described here and elsewhere, it has the advantage of “simplicity” under criterion 4. Whether or not it produces a good fit under the other criteria is, of course, something that you have to find out for each system.

—Scott Calvin

Sarah Lawrence College

On Aug 2, 2016, at 6:27 AM, woschangqiang <woschangqiang@126.com> wrote:

Hi, everyone.

delr=alpha*reff is very powerful in the fit of cubic system. And I want to know whether this function can be used in other crystal system. Thank for your patient answer.

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