Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Zu den pseudobinären Zustandssystemen Bi2Ch2-BiX3 und den ternären Phasen auf diesen Schnitten (Ch = S, Se, Te; X = Cl, Br, I), I: Bismutsulfidhalogenide

The pseudobinary systems Bi2Ch3-BiX3 and the ternary phases on their boundary lines (Ch = S, Se, Te; X = Cl, Br, I), I: Bismuth sulfide halides
 
: Oppermann, H.; Petasch, U.

Zeitschrift für Naturforschung. B 58 (2003), No.8, pp.725-740
ISSN: 0044-3174
ISSN: 0932-0776
English
Journal Article
Fraunhofer IKTS ()

Abstract
The phase diagrams of the systems Bi2S3-BiX3 were constructed from results of DTA and total pressure measurements and x-ray analysis. The phases: BiSCl, Bi4S5Cl2 and Bi19S27Cl3 for X = Cl; BiSBr and Bi19S27Br3 for X = Br; BiSI and Bi19S27I3 for X = I exist on the boundary lines. The enthalpies of formation and standard entropies of the phases follow from the coexistence decomposition pressure functions. The data are: DeltaHdegrees(B)(BiSClf,298) = -49,6 +/- 1,6 kcal/mol Sdegrees(BiSClf,298) = 30,3 +/- 2,5 cal/K.mol DeltaHdegrees(B)(Bi4S5Cl2,f,298) =-144,4 +/- 3 kcal/mol Sdegrees(Bi4S5Cl2,f,298) = 114,0 +/- 4,6 cal/K.mol DeltaHdegrees(B)(Bi19S27Cl3,f,298) = -520 +/- 10 kcal/mol Sdegrees(Bi19S27Cl3f,298) = 490 +/- 10 cal/K.mol DeltaHdegreesB(BiSBrf,298) = -40,2 +/- 1,4 kcal/mol Sdegrees(BiSBrf,298) = 32,0 +/- 3 cal/K.mol DeltaHdegreesB(Bi19S27Br3,f298) = -493,6 +/- 6,7 kcal/mol Sdegrees(Bi19S27Br3,f,298) = 499,8 +/- 17 cal/K.mol DeltaHdegrees(B)(BiSIf,298) = -27,8 +/- 1,4 kcal/mol Sdegrees(BiSIf,298) = 36,1 +/- 2,5 cal/K.mol DeltaHdegreesB(Bi19S27I3,f,298) = -464,4 +/- 15 kcal/mol Sdegrees(Bi19S27I3,f,298) = 502,7 +/- 15 cal/K.mol.

: http://publica.fraunhofer.de/documents/N-37870.html