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Thermochemische Untersuchungen zum ternären System Bi/Se/O. II. Das Teilsystem Bi2

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Thermochemische Untersuchungen zum ternären System Bi/Se/O.

II. Das Teilsystem Bi

2

O

3

ÐSeO

2

Thermochemical Investigations on the Ternary System Bi/Se/O.

II. The Binary System Bi

2

O

3Ð

SeO

2

H. Oppermann*

,a

, H. Göbel

a

, H. Schadow

a

†, P. Schmidt

a

, C. Hennig

a

, V. Vassilev

b

, I. Markova-Deneva

b

a Institut für Anorganische Chemie, TU Dresden, Mommsenstr. 13, D-01069 Dresden

b Institut für Halbleiter, Chemisch-Technologische Universität Sofia, Bulgarien Z. Naturforsch.54 b,239Ð251 (1999); eingegangen am 25. September 1998 Bismuth Selenium Oxides, Coexistence Pressure, Phase Barogram, Differential Thermoanalysis, Phase Diagram

We describe the existence of six thermodynamically stable phases on the binary line Bi2O3ÐSeO2 at room temperature: Bi12SeO20, Bi10Se2O19, Bi16Se5O34, Bi2SeO5, Bi2Se3O9 andBi2Se4O11. At higher temperature we optainedevidence for Bi20Se3O36andBi4SeO8. The decomposition pressures were measured for all phases in a membrane zero manometer and the enthalpy of formation and the standard entropy was determined. The phase baro- gram andphase diagram followedfrom total pressure measurements anddifferential ther- moanalysis. The standard enthalpies of formation of all phases were also derived from solu- tion calorimetry. The necessary data of transitions on molar enthalpies were obtained by DSC- andCp-measurements.

* Sonderdruckanforderungen an Prof. Dr. H. Oppermann.

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