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The present case study critically assesses the efficacy of a previously proposed segmentation methodology as a means to discriminate phases via post-processing the image of an elemental map. In the Bi 2 Te 2.5 S 0.5 multiphase compound, the reference spectra of the Bi 2 Te 3 and Bi 2 Te 2 S phases are distinct enough to effectively distinguish two phases during map acquisition. Since the counts of the sulphur-K peak in the X-ray emission data are significantly higher for Bi 2 Te 2 S compared to Bi 2 Te 3 , the segmentation methodology exploits this variation and enables successful phase discrimination via post-processing the image of the elemental map.

rsc advances

Assessing phase discrimination via the segmentation of an elemental energy dispersive X-ray spectroscopy map: a case study of Bi2Te3 and Bi2Te2S