Thermal properties of Sr0,3 Ba0,7Ti 1-yZryO3 ferroelectric ceramics: Dependence on sample's porosity - García, S.; Marin, E.; Delgado-Vasallo, O.; Porteiles, J.; Rodríguez, G.P.; Calderón, A.; Martínez, E.; Siqueiros, J.M. (Journal De Physique. IV : JP, 2005)