《Table 1.Chemical compositions of primary Bi2Te3 phase and eutectic Bi2Te3/Te phases》

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《Microstructure and phase composition of hypoeutectic Te–Bi alloy as evaporation source for photoelectric cathode》

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wt%

The chemical composition of each phase in the60Te–40Bi alloy was analyzed using SEM-EDS.Fig.5（a）shows a secondary electron image of the 60Te–40Bi alloy.It is clear that there are two areas:namely，the primary phase area and the eutectic phase area.Fig.5（b）shows three EDS profiles taken from areas A，B，and C in Fig.5（a）.The contents of Te and Bi are determined semi-quantitatively by SEM-EDS in areas A，B，and C and are listed in Table 1.The Te contents in areas A and B are consistent with the stoichiometry of Bi2Te3，which is47.8wt%.It is confirmed that area A is the primary Bi2Te3phase and area B is the eutectic Bi2Te3 phase in the eutectic structure.