Effects of B₂O₃Addition on the Sintering Behavior of 0-5-10% ZrO₂Doped BaTiO₃Based Ceramics

Abstract

In this study, the eect of B2O3 addition on the sintering behavior of 0-5-10% ZrO2 doped barium titanate based microwave dielectric ceramics were investigated. For this purpose, the powder mixtures consisting of BaCO3, TiO2 and ZrO2 were prepared by ball milling technique in alcohol using ZrO2 balls at 200 cycle/min for 20 h. The prepared powders were calcined at 900 • C for 2 h. Produced powders were mixed 0.5% B2O3 and 5% PVA and pressed as green body under the pressure of 100 MPa. The disc-shaped die-pressed samples were sintered at 1250 • C, 1350 • C and 1450 • C for 4 h. X-ray diraction analysis showed that the main phases formed in the sintered samples are BaTiO3 and Ba(Ti1−xZrx)O3. The scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to investigate microstructure of the sintered samples. The bulk densities of the sintered samples increased with the addition of B2O3 content due to the low number of pores trapped between the grains.

Influence of ZrO_2 Addition on the Structure and Dielectric Properties of BaTiO_3 Ceramics

“…By adding ZrO 2 into BaTiO 3 , the core-shell structure developed and does not exhibit exaggerated grain growth. It can be shown from the SEM images that the ZrO 2 modified BZT ceramics exhibit fine grain size and tetragonal structure to cubic structural transformation [16][17][18][19]. Figure 4a and b shows the frequency dependence of the dielectric constant and tan δ of Ba(Ti 1−x Zr x )O 3 ceramics (x = 0 ÷ 0.3) measured at 1 kHz to 1 MHz.…”