1. Effects of NiO addition on structure and dielectric properties of BaTiO3-based ceramics.
- Author
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Xu, Qi, Huang, Wanting, Deng, Rui, Chen, Hanxing, and Liu, Hanxing
- Subjects
DIELECTRIC properties ,RELAXOR ferroelectrics ,CERAMICS ,HYSTERESIS loop ,GRAIN size ,MICROSTRUCTURE - Abstract
The phase structure, microstructure, ferroelectric and dielectric properties of NiO-modified BaTiO
3 -4.0 mol%Nb2 O5 ceramics (BT-Nb-Ni) were systematically investigated. All the specimens revealed cubic perovskite structure along with Ba3 Nb3.2 Ti5 O21 second phase by XRD analysis. Small amount of NiO addition (x ≤ 0.5) had the effect of inhibiting grain growth, while a further increase of NiO content (x ≥ 1.0) led to relatively large grains with an average grain size of ~ 0.40 μm. From P-E hysteresis loops and modified Curie–Weiss fitting, NiO addition first reduced and then enhanced the relaxor behaviour of the system. The εr -T curves of BT-Nb-Ni ceramics were significantly flattened, leading to greatly optimized dielectric temperature stability. The optimum property was achieved in the composition BT-Nb-2.0%Ni with εr = 1380 and △C/C25 °C ≤ ± 15% in the temperature range of − 65–170 °C. [ABSTRACT FROM AUTHOR]- Published
- 2021
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