The root-mean-square vibrational displacements of sodium and fluorine ions in sodium fluoride

Abstract

From the X-ray diffraction data from a single crystal of sodium fluoride at room temperature, the root-mean-square vibrational displacements of sodium and fluorine ions were determined to be 0.181 ± 0.001 Å and 0.183 ± 0.005 Å respectively. These values are compared with the values of 0.202 ± 0.007 Å or the two ions obtained by Meisalo & Merisalo [Ann. Acad. Sci. Fenn. AVI (1966). 211, 3-9] from powder data.