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Lattice parameter determination; Bragg angle measurements; crystal and collimator misalignments

A mathematical analysis has been made of the combined effect of crystal and collimator misalignments on Bragg angles measured from zero-layer Weissenberg photographs. The results obtained here have been compared with those available for Bond’s method of measuring Bragg angles with diffractometers. The comparison shows that, for a given amount of crystal and collimator misalignments, Bond’s method and the 2 θ-method do not give identical results for small and intermediate Bragg angles.

V K Wadhawan¹

1. Neutron Physics Section, Bhabha Atomic Research Centre, Bombay - 400085

Published

December 1974

Manuscript received

13 September 1974

Manuscript revised

20 November 1974