Dielectric properties of barium-titanate sintered from tribophysically activated powders

It has been well known that the tribophysical (mechanical) activation could be used as a method for modification of physicochemical properties of disp ersed systems such as polycrystalline mixture of oxides. In this study, we consider the properties of BaTiO3 obtained from tribophysically activated i nitial powders. The mixture of 50 mol% BaCO3 and 50 mol% TiO2 powders was t ribophysically activated in high energy vibromill curing 0, 3, 30, 90 and 1 80 min, calcinated at 800 degrees C for Ih and reaction sintered at 1100, 1 200 and 1300 degrees C for 2 h. The surface specific areas, densities (gree n and sintered), phase compositions and dielectric properties were evaluate d. (C) 1999 Elsevier Science Limited. All rights reserved.