Abstract
The extinction formalism of Becker & Coppens [Acta Cryst. (1974). A30, 129-147, 148-153] is applied to the analysis of room-temperature neutron diffraction data from a large calcium fluoride sphere. Despite severe (predominantly secondary) extinction, excellent agreement is obtained between observed and calculated structure factors. The values obtained for the harmonic vibrational parameters [αCa = 5.71 (0.42) × 10-12 erg A-2, αF = 4.28 (0.22) × 10-12 erg A-2] and for the third-order anharmonic vibrational parameter [βF = --5.7 (2.4) × 10-12 erg A-3] are in satisfactory agreement with previously published values.
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