Effects of Hexagonal BaTiO3 Addition on Textured BaTiO3 Thick Films Prepared by Screen Printing

Abstract

The effects of hexagonal BaTiO3 addition to BaTiO3 thick films were examined. A- and c-axis-preferred BaTiO3 thick films were prepared by hexagonal BaTiO3 addition. The addition of the hexagonal Ba(Ti0.96Mn0.04)O3 was more effective for preparing the a- and c-axis-preferred thick films than the addition of the hexagonal BaTiO3 prepared by reducing BaTiO3 in a 3% H2–N2 atmosphere. According to increases in the firing time at 1370 °C, the Mn of Ba(Ti0.96Mn0.04)O3 in the Ba(Ti0.96Mn0.04)O3-added BaTiO3 thick films was diffused, and the hexagonal phase in the thick films changed to the tetragonal phase. The degree of the preferred orientation of the Ba(Ti0.96Mn0.04)O3-added BaTiO3 thick films increased with increasing firing time. The hexagonal-phase ratio of the reduced BaTiO3-added BaTiO3 thick films decreased markedly when the firing temperature was above 1000 °C. The existence of the hexagonal phase at 1370 °C in which the grain growth advanced could be important in obtaining highly oriented thick films. The tan δ values of the Ba(Ti0.96Mn0.04)O3-added BaTiO3 thick films were lower than 3%. The remanent polarizations of the thick films were greater than 7 µC/cm2.