Effect of Temperature and Potassium Chloride impurity on the relative 1010 tilt grain boundary and surface free energies in ice

CARLOS LEONARDO DI PRINZIO; DRUETTA, ESTEBAN; NASELLO, OLGA BEATRIZ

JOURNAL OF PHYSICAL CHEMISTRY B - (Print)

AMER CHEMICAL SOC

Lugar: Washington; Año: 2014 vol. 118 p. 13365 - 13370

1520-6106

The ratio of the grain boundary free energies relative to the surface free energies can be determined by measuring the root angles of the grooves formed at the intersection of the grain boundary with the free surface. The grooves were copied by plastic replicas and the topographic details were revealed with a Laser Confocal 3D Microscope. Values of were determined for high purity and potassium chloride doped ice bicrystals annealed at -5oC and -18oC. The studied sampled were tilt grain boundaries with between 10o and 180o. The used KCl concentrations were 1 and 10 mol/l and the conductivity of the pure ice was 0.3S. grain boundary relative energies were also determined for different grain boundary inclinations. All the obtained values were analyzed and compared using the CSL (Coincidence Site Lattice) theory. For pure samples annealed at -18oC, an important variation of with the grain boundary inclination was found. In general a remarkable correspondence between CSL planar density  and was observed. Results also showed that the increase of temperature and the impurity changes significantly .