Ternäre Chloride in den Systemen ACl/YCl3 (A = Cs, Rb, K, Na)

✍ Scribed by H. J. Seifert; D. Büchel

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: German
• Weight: 150 KB
• Volume: 624
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/(sici)1521-3749(199802)624:2<342::aid-zaac342>3.0.co;2-k

✦ Synopsis

Phase diagrams of the pseudobinary systems ACl/ YCl 3 (A = Cs, Rb, K, Na) were investigated by DTA and XRD. In all systems compounds of the type A 3 YCl 6 and AY 2 Cl 7 are formed. Furthermore the chlorides A 2 YCl 5 exist with A = Cs, Rb and K, and Cs 3 Y 2 Cl 9 and NaYCl 4 were found. The unit cells of compounds with still unknown structure, were determined by X-ray diffraction on crystal powders. By a combination of solution calorimetry and e.m.f. measurements in galvanic cells for solid electrolytes thermo-dynamic functions for the formation of A n YCl n+3 from (nACl + YCl 3 ) were measured. The compounds Cs 3 Y 2 Cl 9 , Rb 2 YCl 5 and K 3 YCl 6 are stable in competition with the adjacent compounds in their systems only at temperatures > 0 K. The systems ACl/YCl 3 are only gradually different from the systems ACl/HoCl 3 .