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Effects of Mg/Si Ratio on Microwave Dielectric Characteristics of Forsterite Ceramics
Author(s) -
Song K. X.,
Chen X. M.,
Fan X. C.
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01656.x
Subject(s) - forsterite , ceramic , materials science , analytical chemistry (journal) , microwave , phase (matter) , stoichiometry , dielectric , temperature coefficient , mineralogy , metallurgy , chemistry , composite material , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics
Nonstoichiometric Mg 2 SiO 4 forsterite dielectric ceramics with various Mg/Si ratios ( R =2.025, 2.05, and 2.2) were prepared and characterized. The appearance of a MgSiO 3 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 Mg 2 SiO 4 ceramics on eliminating the MgSiO 3 secondary phase, where an enhanced Q × f value and a suppressed temperature coefficient of resonant frequency λ f were obtained. The best microwave characteristics were achieved in the nonstoichiometric forsterite ceramics with an Mg/Si ratio of 2.05: ɛ r =7.5, Q × f =114 730 GHz, and λ f =−59 ppm/°C.