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Rubidium and lithium butanoates binary phase diagram

Formation of a stable lyotropic liquid crystal phase and two mixed salts

Journal of Thermal Analysis and Calorimetry
Authors: F. Martínez Casado, M. Ramos Riesco, and J. Cheda


The temperature and enthalpy vs. composition diagrams of the binary system [xC3H7CO2Li+(1–x)C3H7CO2Rb], where x=mole fraction, were determined by differential scanning calorimetry (DSC). This binary systems displays the formation of two mixed salts with a composition 1:1 and 1:2, which melt incongruently at T fus=590.5 K, with Δfus H m=11.6 kJ mol–1, and congruently at T fus=614.5 K, with Δfus H m=20.2 kJ mol–1, respectively. The phase diagram also presents an ionic liquid-crystalline phase in a wide temperature range: 95 K.

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temperatures. The confined mixtures fuse at temperatures lower than the eutectic and peritectic points of the bulk system, which forms a s–l boundary of a smooth curve. Here, depression of melting points of pure C 12 or C 14 may be understood qualitatively in

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