Journal of Applied Crystallography

Volume 38, Part 4 (August 2005)

research papers

J. Appl. Cryst. (2005). 38, 661-667 [ doi:10.1107/S0021889805016663 ]

Energy calibration and full-pattern refinement for strain analysis using energy-dispersive and monochromatic X-ray diffraction

J. Liu, K. Kim, M. Golshan, D. Laundy and A. M. Korsunsky

Abstract: Precise channel-to-energy conversion is very important in full-pattern refinement in energy-dispersive X-ray diffraction. Careful examination shows that the channel-to-energy conversion is not entirely linear, which presents an obstacle to obtaining accurate quantitative data for lattice strains by pattern refinement. In order to establish an accurate quadratic channel-to-energy conversion function, a Matlab program was written to find the best quadratic coefficient and hence the whole energy conversion function. Then this energy conversion function was used to perform a whole-pattern fitting of the energy-dispersive X-ray diffraction pattern of a Ti64 sample. The strain across the Ti64 bar calculated from the fitting results has been compared with values obtained by single-wavelength X-ray diffraction utilizing a Laue monochromator.

Keywords: energy-dispersive X-ray diffraction; full-pattern refinement; energy conversion; strain analysis; alloys.