ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The Debye-Waller factors of KBr have been determined both by X-ray and by neutron diffraction methods. Previous experiments have been carried out at or above room temperature. No such measurements have been reported at 4.2 K. Neutron diffraction experiments on a KBr powder at 295 and 4.2 K are reported here. The experimental results obtained were BK = 2.55 ± 0.07, BBr = 2.20 ± 0.04 Å2 at T = 295 K, and BK = 0.43 ± 0.05, BBr = 0.35 ± 0.02 Å2 at 4.2 K. These values differ from the theoretical estimates of Reid & Smith [J. Phys. Chem. Solids (1970), 31, 2689-2697], based on a quasiharmonic approximation using the shell model. The discrepancy may be attributed to the partial neglect of anharmonicity in the theoretical estimates.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739478001771
