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The thermal decomposition equilibria of ammonium europium chlorides (NH 4 ) 3 EuCl 6 , (NH 4 ) 2 EuCl 5  and NH 4 Eu 2 Cl 7  have been investigated by total pressure measurements in a membrane zero manometer. The thermodynamic data of these solid phases have been derived from the decomposition functions. The standard enthalpies of solution in 4n HCl (aq.) of (NH 4 ) 3 EuCl 6 , (NH 4 ) 2 EuCl 5 , NH 4 Eu 2 Cl 7 , EuCl 3  and Eu 2 O 3  were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium europium chlorides were derived and compared with the obtained results from the total pressure measurements.

zeitschrift für naturforschung b

Thermische Zersetzung und Lösungskalorimetrie von Ammoniumeuropiumchloriden / Thermal Decomposition and Solution Calorimetry of Ammonium Europium Chlorides