Giant permittivity in (Nb0.5La0.5)xTi1-xO2 ceramics prepared by slip casting in a strong magnetic field |
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| Authors: | Jinqiu Liu Yuechan Song Wenwen Wu Xingang Wang Quan Zhou Gaoyun Niu Peng Liu |
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| Affiliation: | 1. School of Physics and Information Technology, Shaanxi Normal University, Xi'an, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, China |
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| Abstract: | A series of textured (Nb0.5La0.5)xTi1-xO2 (x = 0, 0.0025, 0.005, 0.01) ceramics were sintered in a nitrogen environment after magnetic slip casting (12 T). Component x ranges from 0.0025 to 0.01 while the degree of orientation increases from 0.49 to 0.88. (Nb0.5La0.5)0.01Ti0.99O2 ceramics in the parallel magnetic field's plane have a high permittivity ɛr ≈ 1.6 × 104 and the ultralow dielectric loss tanδ ≈ 0.0038 at 104 Hz. The temperature coefficient value of η ≤ ± 7.1% between 218–473 K, fulfilling the X9R requirements. The giant permittivity properties of textured ceramics are mainly derived from internal barrier layer capacitor impacts, electron hopping, and electron-pinned defect-dipoles polarization. The microstructure evolution of sintered ceramics was modified by texturing in a magnetic field, leading to higher activation energies of dielectric relaxations and resistance of grain boundaries and grains. This excellent performance is expected to show great potential in electronic devices' miniaturization and high-density energy storage. |
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| Keywords: | dielectric relaxation giant permittivity rutile TiO2 textured ceramic X9R capacitor |
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