Thermodynamic Functions of CeBr₃ and Congruently Melting M₃CeBr₆ Compounds (M = Rb, Cs)

Abstract

The enthalpies of phase transitions and heat capacity were measured by differential scanning calorimetry for CeBr3 as well as the Rb3CeBr6 and Cs3CeBr6 congruently melting compounds. A polynomial heat capacity dependence with respect to temperature was used to fit the experimental data. By combining these results with the entropy at 298.15 K, temperatures, and enthalpies of phase transitions, the thermodynamic functions of CeBr3, Rb3CeBr6, and Cs3CeBr6 were calculated up to T = 1100 K.

Determination of the optimum conditions for the synthesis of praseodymium(III) chloride

“…These anhydrous salts commercially available still contain small amounts of water and cannot be used for this study. The synthesis of these salts is the preliminary step to cross [7][8][9]. The synthesis parameters of lanthanide halides (temperature, contact time, chemical composition.…”

“…The synthesis of lanthanide halides is a very long and difficult procedure. This reaction that occurs at high temperatures (of about 1150 K) is often accompanied by side reactions leading to the formation of oxyhalide LnOX (Ln = lanthanide and X = halide) [8][9][10]. It seems that such a situation is caused not only by the well-known difficult features of hightemperature experimentation, but also by the extreme reactivity of lanthanide halides.…”

Calorimetric Investigation of PrBr3-MBr Liquid Mixtures (M = Na, K, Rb, Cs)

“…The present work is a continuation of our systematic research performed on PrBr 3 -based systems. Recently the phase diagrams of PrBr 3 -MBr (M = Li, Na, K, Rb, Cs) binary systems as well as thermodynamic functions of congruently melting M 3 PrBr 6 compounds were determined. − This work reports the results of mixing enthalpy measurements performed on PrBr 3 -MBr (M = Na, K, Rb, Cs) liquid systems over the whole composition range. All gathered experimental data were subsequently optimized by computer coupling of phase diagrams and thermochemistry (CALPHAD) method, as was done for analogous CeBr 3 -MBr binary systems …”