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A Novel Temperature‐Compensated Microwave Dielectric (1− x )(Mg 0.95 Ni 0.05 )TiO 3 − x Ca 0.6 La 0.8/3 TiO 3 Ceramics System
Author(s) -
Shen ChunHsu,
Huang ChengLiang,
Shih ChuanFeng,
Huang ChihMing
Publication year - 2009
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.1744-7402.2008.02326.x
Subject(s) - materials science , dielectric , temperature coefficient , ceramic , microstructure , analytical chemistry (journal) , microwave , sintering , mineralogy , metallurgy , composite material , optoelectronics , telecommunications , chemistry , chromatography , computer science
The microstructure and microwave dielectric properties of a (1− x )(Mg 0.95 Ni 0.05 )TiO 3 − x Ca 0.6 La 0.8/3 TiO 3 ceramics system have been investigated. The system was prepared using a conventional solid‐state ceramic route. In order to produce a temperature‐stable material, Ca 0.6 La 0.8/3 TiO 3 was added for a near‐zero temperature coefficient (τ f ). With partial replacement of Mg 2+ by Ni 2+ , the dielectric properties of the (1− x )(Mg 0.95 Ni 0.05 )TiO 3 − x Ca 0.6 La 0.8/3 TiO 3 ceramics can be promoted. The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. An excellent Q × f value of 118,000 GHz can be obtained for the system with x =0.9 at 1325°C. For practical application, a dielectric constant (ɛ r ) of 24.61, a Q × f value of 102,000 GHz, and a temperature coefficient of resonant frequency (τ f ) of −3.6 ppm/°C for 0.85(Mg 0.95 Ni 0.05 )TiO 3 −0.15Ca 0.6 La 0.8/3 TiO 3 at 1325°C are proposed. A parallel‐coupled line band‐pass filter is designed and simulated using the proposed dielectric to study its performance.