Hierarchical micro-nanostructured albite-based glass-ceramic for high dielectric strength insulators |
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Authors: | V Fuertes MJ Cabrera J Seores D Muñoz JF Fernández E Enríquez |
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Affiliation: | 1. Dept. Electrocerámica, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049, Madrid, Spain;2. Centro tecnológico Vidres, S.L., Ctra. Onda, Km 3.4, 12540, Villareal, Castellón, Spain |
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Abstract: | A novel glass-ceramic material based on albite type Na-rich feldspar has been synthesized by conventional ceramic process. High crystallinity, >94%?Vol.% is obtained by fast sintering which allows energy saving processing. Albite is the main crystalline phase and tetragonal SiO2 is a secondary phase. Electrical properties were examined by complex impedance, DC measurements, and dielectric breakdown test. Dielectric characterization shows a non-Debye type dielectric behavior with low dielectric constant, 4.6 at 1?MHz, low dielectric losses, (~10?3 at 1?MHz, and a large dielectric strength, ~60?kV/mm), that it is the largest value reported in ceramic insulators. Those dielectric properties are attained by the low glassy phase content in the samples and their unique micro-nanostructure. All these properties make this novel material a very promising candidate in the market of ceramic electrical insulator, highlighting for high-voltage applications. |
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Keywords: | Glass ceramic Ceramic electrical insulation Dielectric properties Complex impedance Dielectric breakdown |
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