Untersuchungen zum System BiOCl/SeO2

✍ Scribed by H. Oppermann; Dao Quoc Huong; M. Zhang; P. Schmidt; B. A. Popovkin; S. A. Ibragimov; P. S. Berdonosov; V. A. Dolgikh

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: German
• Weight: 190 KB
• Volume: 627
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/1521-3749(200106)627:6<1347::aid-zaac1347>3.0.co;2-#

✦ Synopsis

The section BiOCl/SeO 2 was shown to be quasibinary one and include only one intermediate phase BiOCl ´SeO 2 = BiSeO 3 Cl. The phase barogram and the phase diagram were determined by total pressure measurements and DTA. BiSeO 3 Cl shows on heating two transitions in crystal phase, (a ® b) at 400 ± 2 °C and (b ® c) at 410 ± 3 °C.

The compound melts peritectically at 417 ± 3 °C. The experiments on sublimation of BiSeO 3 Cl in the temperature gradient and chemical vapour transport with SeO 2 allowed to make the conclusion on the existence of BiSeO 3 Cl molecules in the vapour. Some standard thermodynamic data were determined by solution calorimetry and evaluated from the vapour pressure and chemical vapour transport rate data.