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Miscibility Gap in the System Cesium Amide/Ammonia, CsNH 2 /NH 3 — Thermodynamic Investigations
Author(s) -
Peters Dieter,
Jacobs Herbert
Publication year - 2003
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200390082
Subject(s) - miscibility , caesium , chemistry , ammonia , thermodynamics , ion , spinodal decomposition , hydrogen bond , molecule , hydrogen , amide , phase (matter) , inorganic chemistry , organic chemistry , polymer , physics
The system CsNH 2 /NH 3 is investigated between —50 °C and 120 °C: Partial pressures of ammonia, DTA and density measurements are given as a function of concentration and temperature. Thermodynamic interpretations of the data show that the solutions deviate strongly from the behaviour of ideal mixtures. A monoammoniate of CsNH 2 is stable up to 17 °C. Dilute solutions (≤ 30 mole % CsNH 2 ) have a miscibility gap above 79 ± 5 °C with an almost colourless solution of lower density clearly separated from a yellow one. Phase separation is discussed on the basis of hydrogen bonds between NH 2 —ions as acceptors and NH 3 molecules both solvating cesium ions.