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½á¹¹½âÎöʱ¶¼ÓÐÄÄЩÅжÏÔ×ÓÊÇ·ñ¶¨´íµÄ·½·¨?Re: in general, isotropic displacement parameters, eg. B factor or U factor. (Uiso=Biso/78.96). (anisotropic atomic displacement parameters also work.) For inorganic ionic crystals and intermetallic compounds the typical range of B's is ~0.5 to ~1.0A; for other inorganic and many coordination compounds B varies from ~1 to ~3A, while for organic and organometallic compounds and for solvent or other intercalated non-bonded molecules or atoms this range extends from ~3 to ~10A or higher. If you isotropic displacement parameters in this range are reasonable. Hence, if the B becomes unphysical during the LS refinement, this usually means that the improper type of an atom has been placed in the suspicious site. There are two possibilities: (1) if the chemical element placed in a certain pisition has fewer electrons than is should, then during the refinement its diaplacement parameters becomes negative or much lower than those of the correctly placed atoms; (2) When the site has too many electrons than it really does, displacement parameters of the corresponding atom will be unusually high during the refinement. Maybe helpful! Reference: Fundamentals of Powder diffraction and Structural Characterization of Materials Vitalij K. Pecharsky 2003 |
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