CALORIMETRIC STUDY OF ALKALI-METAL TETRAFLUOROBORATES

Adiabatic calorimetric investigation of the low-temperature heat capac ity of sodium tetrafluoroborate as well as a DSC study of the thermal behavior of potassium tetrafluoroborate and of lithium tetrafluorobora te and its hydrates were carried out. Temperatures and enthalpies of p hase transitions at temperature above ambient were determined for pota ssium tetrafluoroborate, lithium tetrafluoroborate, and lithium tetraf luoroborate mono- and trihydrate. It was demonstrated that lithium tet rafluoroborate has only one phase transition in the solid at 300 K.