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首页> 外文期刊>Physica, B. Condensed Matter >High temperature AC conductivity analysis of ZnO nanoparticles doped BaZr0.15Ti0.85O3 relaxor ceramics
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High temperature AC conductivity analysis of ZnO nanoparticles doped BaZr0.15Ti0.85O3 relaxor ceramics

机译：ZnO纳米粒子的高温AC电导率分析掺杂Bazr0.15Ti0.85O3松弛陶瓷

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摘要

This article covers the microstructure, AC conductivity (sigma(ac)) and impedance analysis of lead-free polycrystalline BaZr0.15Ti0.85O3 (BZT) piezoceramics modified by the addition of 1 wt % ZnO nanoparticles synthesized by the conventional mixed oxide route. Nanoparticles of ZnO with an average diameter of similar to 41 nm have been produced via direct precipitation method. XRD study confirms the hexagonal symmetry (space group P63mc) of ZnO while sintered BZT ceramic compositions consist of single phase tetragonal perovskite structure with the space group (P4mm). Role of ZnO as sintering aid is confirmed via SEM analysis since dense microstructure (with increase in the grain size) of doped BZT composition was achieved. The negative temperature coefficient of resistance (NTCR) behavior which refers to decrease in electrical resistance with increase in temperature is investigated for both compositions while high temperature AC conductivity analysis proposed that the conduction in studied compositions is due to hopping charge mechanism.
机译：本文涵盖通过加入通过常规混合氧化物途径合成的1wt％ZnO纳米颗粒改性的无铅多晶Bazr0.15Ti0.85O3（BZT）压电蛋白的微观结构，交流电导率（Sigma（AC））和阻抗分析。通过直接沉淀法生产平均直径与41nm相似的ZnO的纳米颗粒。 XRD研究证实了ZnO的六方对称性（空间组P63MC），而烧结的BZT陶瓷组合物由单相四方钙钛矿结构组成，具有空间组（P4mm）。通过SEM分析证实了ZnO作为烧结助剂的作用，因为达到了掺杂的BZT组合物的致密微观结构（随着晶粒尺寸的增加）。对两种组合物研究了具有升高的电阻下降的电阻（NTCR）行为的负温度系数（NTCR）行为，而在高温AC电导率分析中提出了研究中的传导是由于跳跃电荷机制的导通。

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