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Removal of small parasite peaks in powder diffraction data by a multiple deconvolution method

  • Takashi Ida (a1), Shoki Ono (a1), Daiki Hattan (a1), Takehiro Yoshida (a1), Yoshinobu Takatsu (a1) and Katsuhiro Nomura (a2)...

Four series of small parasite peaks observed in powder diffraction data recorded with a Cu-target X-ray tube and a Ni filter on the diffracted beam side in Bragg–Brentano geometry are investigated. One series of the parasite peaks is assigned to the tungsten -emission. Other three types of the parasite peak series are likely to be caused by the K-emissions of Ni, but the peak locations are deviated from those predicted by the Bragg's law. An empirical formula to locate the parasite peaks and a method to remove them from observed powder diffraction data are proposed. The method is based on the whole-pattern deconvolution–convolution treatment on the transformed scale of abscissa. The parameters optimized for the diffraction data measured for Si powder has been applied on treatment of the data of LaB6 powder recorded under the same experimental conditions. It has been confirmed that the parasite peaks in the observed data can effectively be removed by the deconvolution treatment with parameters determined by a reference measurement.

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Allison, S. K. and Armstrong, A. H. (1925). “Experiments on the relative intensities of some X-ray lines in the L spectrum of tungsten and the K spectrum of copper,” Phys. Rev. 26, 714723.
Ida, T. and Toraya, H. (2002). “Deconvolution of the instrumental functions in powder X-ray diffractometery,” J. Appl. Crystallogr. 35, 5868.
Ida, T., Ono, S., Hattan, D., Yoshida, T., Takatsu, Y., and Nomura, K. (2018a). “Deconvolution-convolution treatment on powder diffraction data collected with Cu Kα X-ray and Ni Kβ filter,” Powder Diffr. 33, 8087.
Ida, T., Ono, S., Hattan, D., Yoshida, T., Takatsu, Y., and Nomura, K. (2018b). “Improvement of deconvolution-convolution treatment of axial-divergence aberration in Bragg-Brantano geometry,” Powder Diffr. 33, 121133.
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Powder Diffraction
  • ISSN: 0885-7156
  • EISSN: 1945-7413
  • URL: /core/journals/powder-diffraction
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