Thermal and Mechanical Instabilities in the Alignment of Bragg-Brentano Parafocussing Powder Diffractometers
- 1 March 1987
- journal article
- research article
- Published by Cambridge University Press (CUP) in Powder Diffraction
- Vol. 2 (1) , 7-21
- https://doi.org/10.1017/s0885715600012161
Abstract
Using a standard laboratory X-ray powder diffractometer under very stable environmental conditions, it has been found that measurements of the positions and heights of sharp diffraction maxima can be made with a precision of order 2 × 10 −4° in 2θ and 0.1% in height (for ∼ 2 × 105 counts per point at the peak). Under normal conditions, however, displacements of order 0.02° in 2θ and 3% in height are observed. These shifts have been attributed to changes in the diffraction geometry, in particular the sourcedivergence slit configuration, brought about by changes in ambient temperature and by changes in the temperature of the liquid used to cool the X-ray tube.Keywords
This publication has 1 reference indexed in Scilit:
- Towards Improved Alignment of Powder DiffractometersPowder Diffraction, 1986