Chemical Vapour Transport of Bismuth and Antimony Chalcogenides M(2)Q(3) (M = Sb, Bi, Q = Se, Te)
Zeitschrift für anorganische und allgemeine Chemie(2010)
摘要
Thermodynamic modelling of the ternary systems M/Q/I (M = Sb, Bi, Q = Se, Te) indicated solid-gas equilibria suitable for chemical vapour transport of bismuth and antimony chalcogenides. The predictions of the modelling were confirmed by transport experiments on a transport balance. The optimum transport conditions using iodine as transport agent were determined for all systems to: theta(source) = 500 degrees C and theta(sink) = 450 degrees C. For Delta T > 50 K the sequential transport of chalcogenide iodides MQI followed by M(2)Q(3) occurs. Thermodynamic standard data of the gas species SbI(g) were concluded from equilibrium calculations: Delta H-f.298(0)(SbI(g)) = 106 +/- 3 kJ.mol(-1); S-298(0)(SbI(g)) = 255 +/- 3 J.mol(-1).K-1; C-p(SbI(g)) = 37 +/- 1 J.mol(-1).K-1
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关键词
Antimony,Bismuth,Selenium,Tellurium,Chemical vapor transport,Thermodynamic modelling
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