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Composition dependence of phase structure and electrical properties of (1−y)Bi1−x Nd x FeO3−y BiScO3 ceramics

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Abstract

In this work, we have studied a new lead-free ceramic of (1−y)Bi1−x Nd x FeO3-y BiScO3 (0.05≤x≤0.15 and 0.05≤y≤0.15) prepared by a conventional solid-state method, and the influences of Nd and Sc content on their phase structure and electrical properties were investigated in detail. The ceramics with 0.05≤x≤0.10 and 0.05≤y≤0.15 belong to an R3c phase, and the rhombohedral-like and orthorhombic multiphase coexistence is established in the composition range of 0.125≤x≤0.15 and y=0. The electrical properties of the ceramics can be enhanced by modifying x and y values. The highest piezoelectric coefficient (d 33~51 pC/N) is obtained in the ceramics with x=0.075 and y=0.125, which is superior to that of a pure BiFeO3 ceramic. In addition, a lowest dielectric loss (tan δ~0.095%, f=100 kHz) is shown in the ceramics with x=0.15 and y=0 due to the involvement of low defect concentrations, and the improved thermal stability of piezoelectricity at 20–600°C is possessed in the ceramics. We believe that the ceramics can play a meaningful role in the high-temperature lead-free piezoelectric applications.

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Authors and Affiliations

  1. Department of Materials Science, Sichuan University, Chengdu, 610064, China

    Hong Tao & JiaGang Wu

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  1. Hong Tao
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  2. JiaGang Wu
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Correspondence to Hong Tao or JiaGang Wu.

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Tao, H., Wu, J. Composition dependence of phase structure and electrical properties of (1−y)Bi1−x Nd x FeO3−y BiScO3 ceramics. Sci. China Technol. Sci. 59, 1029–1035 (2016). https://doi.org/10.1007/s11431-016-6051-0

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