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- W2021198321 abstract "Abstract The lifetime spectrum of positron in β-C2S of added Na2O or P2O5 is studied with positron annihilation technique. According to the theory of the capture of positron, we discuss the relationship between lifetime spectrum parameters obtained through experiment and the microstructure of β-C2S. The results show that the long living component τ2 (about 470 ps) represents the capture of positron in the defects of Ca2+ vacancies and that the intensity of I2 of τ2 decreases with the increasing of Na+ and increases with the increasing of P5+. The results also verify that Na+ replaces Ca2+ and creates anion vacancies; while P5+ replaces Si4+ and creates cation vacancies. Vacancy concetration increases Na+ and P5+. Our work shows that the positron annihilation technique is a useful tool for studying the change of microstructure defects in doped β-C2S. The relationship between heat treatment and hydration activity of doped β-C2S and its impurities are also studied and discussed." @default.
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- W2021198321 date "1987-07-01" @default.
- W2021198321 modified "2023-09-27" @default.
- W2021198321 title "Research of positron annihilation and hydration of doped β-C 2 S" @default.
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