title: Kinetics of crystal growth and dissolution of calcium and magnesium fluorides.
abstract: Kinetic results of the crystal growth and dissolution of seed crystals of calcium fluoride and magnesium fluoride, obtained conductimetrically and potentiometrically, indicate that both processes are controlled by a surface reaction mechanism. An initial reaction surge in the case of magnesium fluoride is consistent with a concomitant secondary nucleation process. The activation energies for the growth and dissolution of calcium fluoride, 14.5 and 1.4 kcal mole-1, also point to surface reaction control. The heat of solution of this salt, obtained calorimetrically, was 2.9 +/- 0.1 kcal mole-1.
mesh_terms: D002124:Calcium Fluoride; D003460:Crystallization; D004553:Electric Conductivity; D005459:Fluorides; D007700:Kinetics; D008274:Magnesium; D012995:Solubility; D013499:Surface Properties; D013696:Temperature
chemical_list: D008274:Magnesium; D002124:Calcium Fluoride; D005459:Fluorides