Vapour-solid phase equilibrium of Bi2(Se1−xSx)3 ternary crystals
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Abstract:

AbstractWith the objective of analysing the relations between the concentration of free carriers in Bi2(Se1−xSx)3 ternary crystals and the vapour pressures of selenium and/or sulphur, a model describing the equilibrium between the vapour and the solid phase of a ternary crystal has been worked out by adopting the simplification that the ternary system can be taken for an ideal solid solution where the activity of Bi2S3 is equal to its concentration. Such an approach makes possible the determination of the equilibrium pressures of selenium and sulphur at various x values. Using pairs of these values, we calculated the equilibrium constant for the reaction V′A+y2 S2(g)+(l−y)2 Se2(g) + e′0 at a temperature of 700 K. The proposed model explains well the experimentally observed variation of the concentration of free carriers in Bi2(Se1−xSx)3 crystals with increasing value of x (x = 0.00−0.16) under identical growth conditions.

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