Suppressing resistance degradation in SrTiO3-based colossal permittivity capacitor material |
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| Affiliation: | 1. School of Electronic Information and Artificial Intelligence, Shaanxi University of Science & Technology, Xi''an, 710021, Shaanxi, China;2. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi''an, 710021, China;1. Department of Science and Humanities, Sri Krishna College of Engineering and Technology, Coimbatore, 641008, Tamilnadu, India;2. Department of Physics, KPR Institute of Engineering and Technology, Coimbatore, 641407, Tamilnadu, India;3. Physics Department, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia;1. State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan, Hubei, 430200, China;2. School of Textile Science and Engineering, Wuhan Textile University, Wuhan, Hubei, 430200, China;1. Instituto de Física, Benemérita Universidad Autónoma de Puebla, Edificio IF-1, Ciudad Universitaria, Puebla, Pue, 72570, Mexico;2. CONACYT-Instituto de Física Luis Rivera Terrazas, Benemérita Universidad Autónoma de Puebla, Edificio IF-1, Ciudad Universitaria, Puebla, Pue, 72570, Mexico;3. Departamento de Física, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, D.F., C.P. 11801, Mexico;4. Grupo de Materiales Ferroicos de la Facultad de Física - Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, San Lázaro y L, 10400, Habana, Cuba;1. School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China;2. Xuzhou College of Industrial Technology, Xuzhou, 221140, China;3. School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China;1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China;2. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravskia cesta 9, SK-84536, Bratislava, Slovakia |
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| Abstract: | At present, research on colossal permittivity materials is extensive but challenging to achieve simultaneous properties of colossal permittivity, low loss, and high resistivity. Resistance degradation also restricts industrial application of colossal permittivity materials. In this work, a new method has been proposed to improve resistivity of colossal permittivity ceramics by making metal ions diffuse on ceramic grain boundaries, thus inhibiting the diffusion of oxygen vacancies at grain boundaries. Sr0.99La0.01TiO3(SLT10) ceramics were synthesized by traditional solid-state method, and then Bi2O3 (35%)-Al2O3 (10%)-MgO (20%)-CuO (25%)-SiO2 (10%) mixed oxidant was selected to percolate into ceramics. The resistivity of SLT10 ceramics improved remarkably (from 2.1×108 Ω cm to 1.23×1011 Ω cm under DC 100 V) with a colossal permittivity (16695 @1 kHz) and a low dielectric loss (0.016 @1 kHz), as well as excellent frequency stability (20 Hz–2 MHz) and temperature stability (-170 °C to 375 °C). The source of high insulation resistivity of the SLT10 ceramic sample was discussed. Subsequent examination uncovered that grain in the SLT10 ceramics percolated with metal ions displayed semiconducting characteristics, wherein insulation grain boundaries significantly influenced the ceramic's resistivity and served as formidable potential barriers constraining long-range movement of charge carriers. Experimental analysis demonstrated that the resistance degradation behavior of the SLT10 ceramics was suppressed, the breakdown voltage was increased, and the service life was extended. |
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| Keywords: | Colossal permittivity Grain boundary Resistance degradation |
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