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Temperature Compensating Microwave Dielectric Based on the (Mg 0.95 Ni 0.05 )TiO 3 –(La 0.5 Na 0.5 )TiO 3 Ceramic System
Author(s) -
Shen ChunHsu,
Huang ChengLiang,
Shih ChuanFeng,
Huang ChihMing
Publication year - 2010
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.1744-7402.2009.02400.x
Subject(s) - materials science , dielectric , ceramic , temperature coefficient , analytical chemistry (journal) , microstructure , microwave , atmospheric temperature range , composite material , optoelectronics , telecommunications , thermodynamics , physics , chemistry , chromatography , computer science
The microstructures and microwave dielectric properties of the novel temperature‐compensated composite ceramic (1− x )(Mg 0.95 Ni 0.05 )TiO 3 – x (La 0.5 Na 0.5 )TiO 3 were investigated. Dense and mixed phase samples were produced in the range of 0.05≤ x ≤0.9. When the x value increased, the quality factor ( Q × f ) decreased nonlinearly while the dielectric constant (ɛ r ) steadily increased almost linearly due to the compensation effect. The temperature coefficient of resonant frequency (τ f ) was remarkably improved with an increase of (La 0.5 Na 0.5 )TiO 3 content. With x =0.13, a dielectric constant (ɛ r ) of 23.22, a Q × f value of 86,500 GHz, and a τ f value of 2.8 ppm/°C was obtained for 0.87(Mg 0.95 Ni 0.05 )TiO 3 –0.13(La 0.5 Na 0.5 )TiO 3 ceramics sintered at 1275°C for 4 h. Moreover, a band‐pass filter with traditional hairpin resonators with a center frequency of 2.4 GHz was designed and fabricated using the proposed dielectric ceramic to study its performance.