Effect of NiO additive on microstructure, mechanical behavior and electrical properties of 0.2PZN–0.8PZT ceramics
Effect of NiO additive on microstructure, mechanical behavior and electrical properties of 0.2PZN–0.8PZT ceramics
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DOI：
10.1016/j.jeurceramsoc.2012.12.025
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发表时间：
2013-08
影响因子：
5.7
通讯作者：
Mupeng Zheng;Y. Hou;H. Ge;M. Zhu;Hui Yan
中科院分区：
文献类型：
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作者：
Mupeng Zheng;Y. Hou;H. Ge;M. Zhu;Hui Yan
制备并研究了添加nio的Pb((Zn1/3Nb2/3)0.20(Zr0.50Ti0.50)0.80) o3体系。结果表明，Ni的掺入引起了相变，从晶界向四方晶界转变。在NiO形态下，当溶解度超过0.3wt%时，过量的Ni离子在晶界和三结处偏析，有利于形成过量PbO的液相，导致晶粒显著长大。通过控制添加剂的含量，可以调整合金的力学性能（维氏硬度（Hv）和断裂韧性（KIC））；这伴随着断裂模式从未添加NiO的穿晶断裂到添加1.0wt% NiO的沿晶断裂的转变。此外，NiO的加入减弱了介质弛豫行为，同时改善了压电性能。添加0.5wt% NiO的0.2PZN-0.8PZT具有良好的传导系数（d33·g33=10,050×10−15m2/N）和较大的断裂韧性（KIC=1.35 mpam /2）。
A NiO-added Pb((Zn1/3Nb2/3)0.20(Zr0.50Ti0.50)0.80)O3system is prepared and investigated. The results reveal that Ni doping induces a phase transformation from the morphotropic phase boundary to the tetragonal phase side. Above the solubility limit of 0.3wt% in NiO form, excess Ni ions segregate at the grain boundaries and triple junctions, which facilitate the formation of a liquid phase with excess PbO and lead to remarkable grain growth. The mechanical behavior (Vickers hardness (Hv) and fracture toughness (KIC)) can be tailored by controlling the content of additive; this is accompanied by a transition in the fracture mode changed from transgranular without NiO additive to intergranular with 1.0wt% NiO additive. Moreover, the NiO addition weakens the dielectric relaxor behavior and improves the piezoelectric properties simultaneously. The 0.2PZN–0.8PZT with 0.5wt% NiO addition shows good transduction coefficient (d33·g33=10,050×10−15m2/N) and large fracture toughness (KIC=1.35MPam1/2).