Evolución Microestructural de Materiales Cerámicos de BaTiO3 Dopados con Antimonio

Ceramic materials based on BaTiO 3 modified with small amounts of antimony show interesting electric properties which make them valuable for electronic industry. These properties depend on the microstructure of the material, which is controlled by both the dopant concentration and the doping process. The aim of the present work is to study the microstructure development of Sb-doped BaTiO 3 materials for concentrations ranging from 0.05 to 0.6 mol%. Doping was carried out following two different methods, the traditional mixing of oxides and surface doping starting from Sb(O(CH) 3 CH 3 ) 3 . Materials sintered between 1300-1400°C show quite different microstructure. For surface doped materials, a Sb 2 O 3 concentration of 0.05 mol% leads to well densified materials with homogeneous fine-grained microstructure. On the other hand, the traditional oxide doped materials show exaggerated grain growth.