Authors:Edward Krzyżak, Alina Wojakowska, Andrzej Wojakowski, and Marek Wołcyrz
Phase diagram for the system CuBr–LiBr was determined by differential scanning calorimetry and X-ray powder diffraction. The
system exhibits a significant solid solubility of the components, especially LiBr in the respective polymorphic modifications
of CuBr. Another feature of the system CuBr–LiBr is the occurrence of five invariant three-phase equilibria, which have been
assigned to one eutectic (684 K), one peritectoid (668 K), and three eutectoids (679, 645, and 521 K). From the experimental
results, formation of a compound LiCuBr2, at 521 K is discerned.
Authors:Edward Krzyżak, Berenika Szczęśniak-Sięga, Dominika Szkatuła, and Wiesław Malinka
The new derivatives of 3,4-pyridinedicarboximide were synthesised. Experimental measurements were carried out using 1H NMR spectra, IR spectra, elemental analyses and differential scanning calorimetry. The purpose of this study was to study the thermal stability of these four new compounds and to establish a solid-state polymorphism. Measurements were carried out for samples obtained from ethanol and n-hexane and after a long-time storage.