Optical and Microwave Dielectric Properties of Transparent MgAl₂O₄ Ceramics

Abstract:

Transparent polycrystalline MgAl₂O₄ ceramics were fabricated by using spark plasma sintering (SPS) technique at a temperature range from 1275 °C to 1400 °C. The average grain size of the samples fabricated at optimal sintering processes was 345 nm. The in-line transmittance of the sintered ceramics can be as high as 70% at 550 nm and 82% at 2000 nm, respectively. The optimal microwave dielectric properties (εr = 8.38, Q×f = 54000 GHz and τf = -74 ppm/°C) were achieved at 1325°C for 20 min.

• Periodical: Advanced Materials Research (Volume 647)
• Pages: 758-761
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.647.758
• Online since: January 2013
• Authors: Ping Fu, Wen Zhong Lu, Wen Lei, Yong Xu, Xian Long Lu
• Keywords: In-Line Transmittance, Microwave Dielectric Properties, Spark Plasma Sintering (SPS), Transparent MgAl₂O₄ Ceramics

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