2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 6: Rare Earths & Ionic Liquids
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 432 pages |
| ISBN: | 978-1-987820-08-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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PHASE DIAGRAMS OF THE DyBr3-MBr (M = Li-Cs)
Ida Chojnacka1; Leszek Rycerz1;1CHEMICAL METALLURGY GROUP, WROCLAW UNIVERSITY OF TECHNOLOGY, Wroclaw, Poland;
Type of Paper: Regular
Id Paper: 21
Topic: 9
Abstract:
Phase equilibria in the DyBr3-MBr (M = Li, Na, K, Rb, Cs) binary systems were established by differential scanning calorimetry (DSC). The composition of eutectics was always determined by the Tamman method.
The DyBr3-LiBr phase diagram exhibits two eutectics and has two stoichiometric compounds. The first compound, Li3DyBr6, melts congruently at 803 K. The second one, Li6DyBr9, decomposes in the solid state at 656 K. The composition of two eutectic mixtures was determined as x(DyBr3) = 0.156 (787 K) and 0.321 (791 K).
The DyBr3-NaBr phase diagram exhibits incongruently melting compound Na3DyBr6 and one eutectic located at DyBr3 molar fraction x = 0.409 (T = 711 K). Na3DyBr6 undergoes a solid-solid phase transition at 740 K and melts at 762 K.
The DyBr3-KBr phase diagram exhibits two eutectics and two stoichiometric compounds. The first compound, K3DyBr6(s), undergoes a solid-solid phase transition at 694 K and melts congruently at 991 K. The second one, K2DyBr5(s), melts incongruently at 733 K. The compositions of two eutectic mixtures were determined as x(DyBr3) = 0.159 (886 K) and 0.454 (689 K).
The DyBr3-RbBr phase diagram exhibits two eutectics and three stoichiometric compounds. The first compound, Rb3DyBr6(s), undergoes a solid-solid phase transition at 726 K and melts congruently at 1059 K. Rb2DyBr5(s) melts incongruently at 737 K and RbDy2Br7(s) at 748 K. The compositions of two eutectic mixtures were found to be: x(DyBr3) = 0.116 (886 K) and 0.458 (702 K).
The DyBr3-CsBr phase diagram exhibits two eutectics and two stoichiometric compounds. The first compound, Cs3DyBr6, undergoes a solid-solid phase transition at 724 K and melts congruently at 1086 K. The second one, Cs3Dy2Br9, melts incongruently at 891 K. The compositions of CsBr-Cs3DyBr6 and K3Dy2Br9-DyBr3 eutectic mixtures were determined as x(DyBr3) = 0.102 (T = 862 K) and 0.579 (T = 795 K), respectively.