[15a-D215-1~9] 9.1 Dielectrics, ferroelectrics

[15a-D215-5] Synthesis of Microwave-Dielectrics Mg₂SiO₄ Plate-like Crystals by Flux Method and Dielectric Property of Resin/Mg₂SiO₄ Composites

〇Shintaro Ueno¹, Kiyoshi Saito¹, Ichiro Fujii¹, Satoshi Wada¹, Hiraku Maruyama², Masanori Yamazaki² (1.Univ. of Yamanashi, 2.Mitsubishi Chemical)

Keywords:Flux method, Microwave dielectrics, Composite materials

The Mg₂SiO₄ (forsterite) plate-like particles with high aspect ratio were synthesized by a flux method for resin–Mg₂SiO₄ composite dielectrics which exhibit low dielectric loss and low coefficient of thermal expansion (CTE) for micro- and milli-wave wireless communication systems. The Zn₂SiO₄ (willemite) precursor nanoparticles were reacted with magnesium sources in alkali-chloride flux, and the high-crystallinity Mg₂SiO₄ micrometer-sized plates could be synthesized at the much lower temperature as compared to the conventional methods. The resin–Mg₂SiO₄ composite materials which contained 16 vol% of these Mg₂SiO₄ micrometer-sized plates exhibited the low dielectric loss comparable to the pure resin. Additionally, the CTE of this composite was decreased compared with pure resin owing to the constraint effect of high aspect ratio fillers.