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what is typical Beq (atomic displacement parameter) range?
learntopas #1
User title: learntopas
Member since Mar 2019 · 3 posts
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Subject: what is typical Beq (atomic displacement parameter) range?
Hi,

I have two questions about atomic displacement parameters.

1. What is typical Beq range? Is it around 0.1-15? For Uiso, it is less than 0.2, and I used U = B / 8pi^2 to convert. I dont know if I can convert like this.
2. Do you usually refine Beq with standard XRD powder pattern?

Thanks for your time.
rowlesmr #2
Member since Oct 2011 · 229 posts
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For inorganics, I usually see beqs between 0.2 and 1. Organics up to ~10. I use U = B / 8pi^2 to convert, so we're the same on that.

Depending on resolution, peaks hieghts, angular range, you can refine beqs. But be careful, and check then against single crystal values.

Matthew
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Matthew
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