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Microwave Dielectric Properties of Fused Silica Prepared by Different Approaches
Author(s) -
Li Lei,
Fang Yong,
Xiao Qing,
Wu Yong Jun,
Wang Nan,
Chen Xiang Ming
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2012.02846.x
Subject(s) - materials science , microwave , spark plasma sintering , dielectric , sintering , substrate (aquarium) , temperature coefficient , analytical chemistry (journal) , composite material , optoelectronics , chromatography , geology , physics , quantum mechanics , oceanography , chemistry
Fused silica was prepared by different approaches, and the microwave dielectric properties were investigated. For the fused silica sintered at 1100°C by solid‐state sintering, the dielectric constant (ε r ) and Qf value increased with increasing the sintering time up to 5 h, while the temperature coefficient of resonant frequency (τ f ) decreased. The optimal properties with low ε r of 3.72, high Qf value of 44,300 GHz, and low τ f of −14.4 ppm/°C were achieved when sintered at 1100°C for 5 h. The microwave dielectric properties could be further improved by other preparing approaches, as listed below: ε r = 3.90, Qf = 63,500 GHz, τ f = −5.7 ppm/°C for spark plasma sintering, and ε r = 3.83, Qf = 122,100 GHz, τ f = −8.3 ppm/°C for melting method. The results showed that fused silica was a good candidate as a microwave substrate material.