材料科学
铁电性
正交晶系
电介质
介电常数
钙钛矿(结构)
陶瓷
凝聚态物理
压电响应力显微镜
磁滞
相对介电常数
晶体结构
结晶学
光电子学
复合材料
物理
化学
作者
Zimeng Hu,Hangfeng Zhang,Michael J. Reece,Giuseppe Viola,Haixue Yan
标识
DOI:10.1016/j.jeurceramsoc.2022.09.045
摘要
Relaxor ferroelectric behaviour was observed in perovskite layered structure (PLS) (Ca0.5Sr0.5Ba0.5Pb0.5)Nb2O7 (CSBPN) ceramics engineered using the high entropy approach. The CSBPN ceramics were sintered at 1350 °C and are single-phase with an orthorhombic structure (Cmcm space group) at room temperature. Their relaxor ferroelectric behaviour is characterized by a broad and frequency-dependent permittivity maximum and a current peak around zero electric field in the hysteresis loop. The presence of polar nanoregions is supported by piezoresponse force microscopy images. The value of the relative permittivity ɛ′ = 130 at 1 kHz and room temperature is much larger than that for conventional PLS ceramics Sr2Nb2O7 (ɛ′ = 42) and Ca2Nb2O7 (ɛ′ = 38). This can be attributed to the presence of polar nanoregions and the lattice distortion effect in high entropy materials. The appealing dielectric and relaxor behaviour of CSBPN ceramics confirms the efficacy of the high entropy approach to obtain improved properties.
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