Influence of sintering temperatures on microstructures and electrical properties of Bi4Ti2.95W0.05O12.05+0.2 wt%Cr2O3 ceramics

Sintering temperatures (1050-1150 degrees C) play an important role on influencing microstructures and electrical properties of Bi4Ti2.95W0.05O12.05 + 0.2 wt%Cr2O3 ceramics. Firstly, the lattice constants and relative density of samples varied with sintering temperatures. And the increase in sintering temperatures increased their grain size and decreased the porosity, resulting in the extreme grain growth of the sample sintered at 1150 degrees C. Based on these structural evolutions, epsilon(r),TK epsilon and tan delta of samples deceased with the increase in sintering temperatures, while T-c, d(33) and k(p) increased with it. rho(dc) of samples also increased with the increase in sintering temperatures below 1125 degrees C, but decreased sharply at 1150 degrees C. The variation in 2E(c) of samples with sintering temperatures may be related to the 90 degrees domain walls. The sample sintered at 1150 degrees C presented a lower rho(dc) due to the high aspect ratio, but possessed a higher d(33) due to the large grain size. (C) 2015 Elsevier Ltd. All rights reserved.