کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1460882 | 989611 | 2015 | 7 صفحه PDF | دانلود رایگان |
The dielectric properties and microstructure of (Ba0.7Sr0.25Ca0.05)(Ti0.9Zr0.1)O3 (BSCTZ) ceramics have been controlled by ZnO addition and/or two-step sintering. The single-phase perovskite structure was observed for all investigated specimens with ZnO addition in the range of 0≤x≤0.15 wt%. With increasing ZnO content, the unit cell volume increased due to the Zn2+ substitution for Ti4+, and the dielectric constant (εr), dielectric loss (tan δ), and breakdown voltage (Vb) of the specimens decreased. The specimens sintered by a two-step method showed high density and homogeneous microstructure with smaller grains which enhanced Vb, whereas εr decreased and tan δ increased slightly. The dielectric properties of the two-step sintered specimens could be controlled by the first-stage sintering temperature T1 because the grain size was more strongly dependent on T1 than on the ZnO content. P–E hysteresis loops were not changed remarkably by ZnO addition and/or two-step sintering.
Journal: Ceramics International - Volume 41, Supplement 1, July 2015, Pages S2–S8