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Song, K. X.; Chen, X. M.; Fan, X. C.
Journal of the American Ceramic Society, June 2007, Letnik: 90, Številka: 6Journal Article
Nonstoichiometric Mg2SiO4 forsterite dielectric ceramics with various Mg/Si ratios (R=2.025, 2.05, and 2.2) were prepared and characterized. The appearance of a MgSiO3 secondary phase could be effectively suppressed by adjusting the nonstoichiometry, and a single‐phase forsterite structure was obtained in the present ceramics with Mg/Si ratios of 2.025 and 2.05. The microwave dielectric characteristics were significantly improved in the nonstoichiometric Mg2SiO4 ceramics on eliminating the MgSiO3 secondary phase, where an enhanced Q×f value and a suppressed temperature coefficient of resonant frequency λf were obtained. The best microwave characteristics were achieved in the nonstoichiometric forsterite ceramics with an Mg/Si ratio of 2.05: ɛr=7.5, Q×f=114 730 GHz, and λf=−59 ppm/°C.
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