Abstract
A pure mixed alkali–alkaline earth metal borate of Li2Sr4B12O23 with microporous structure has been synthesized by high-temperature solid state reaction, and characterized by XRD, FT-IR, TG techniques, and chemical analysis. The molar enthalpies of solution of Li2Sr4B12O23 in 1 mol L−1 HCl(aq), and of SrCl2·H2O(s) in [1 mol L−1 HCl + H3BO3 + LiCl·H2O](aq) have been determined by microcalorimeter at 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpies of solution of H3BO3(s) in 1 mol L−1 HCl(aq), and of LiCl·H2O(s) in [1 mol L−1HCl + H3BO3](aq), together with the use of the standard molar enthalpies of formation for SrCl2·6H2O(s), LiCl·H2O(s), H3BO3(s), HCl(aq), and H2O(l), the standard molar enthalpy of formation of −(11,534.0 ± 10.0) kJ mol−1 for Li2Sr4B12O23 was obtained on the basis of the appropriate thermochemical cycle.
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