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Microwave Dielectric Properties of (1 − x )( Mg 0.95 Ni 0.05 ) TiO 3 – x ( Ca 0.8 Sr 0.2 ) TiO 3 Ceramic System With Near‐Zero Temperature Coefficient
Author(s) -
Shen ChunHsu,
Huang ChengLiang,
Chen WeiTing,
Pan ChungLong
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.1744-7402.2011.02678.x
Subject(s) - materials science , dielectric , temperature coefficient , analytical chemistry (journal) , microwave , microstructure , ceramic , scanning electron microscope , mineralogy , perovskite (structure) , phase (matter) , mixed oxide , oxide , crystallography , metallurgy , composite material , optoelectronics , chemistry , telecommunications , organic chemistry , computer science , chromatography
The microwave dielectric properties of the (1 − x )( Mg 0.95 Ni 0.05 ) TiO 3 – x ( Ca 0.8 Sr 0.2 ) TiO 3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means X ‐ray and scanning electron microscopy. The microwave dielectric properties are strongly related to the density and matrix of the specimen. Combination of ( Mg 0.95 Ni 0.05 ) TiO 3 (ilmenite‐type structure) and ( Ca 0.8 Sr 0.2 ) TiO 3 (perovskite‐structured) forms a two‐phase system and leads to a near‐zero temperature coefficient (τ f ). With increasing x , the quality factor ( Q × f ) decreased and dielectric constant (ε r ) increased. A new microwave dielectric material 0.95( Mg 0.95 Ni 0.05 ) TiO 3 –0.05( Ca 0.8 Sr 0.2 ) TiO 3 , possessing excellent microwave dielectric properties with a dielectric constant (ε r ) of 21.68, a quality factor ( Q × f ) of 94,000 (GHz) and a temperature coefficient (τ f ) of approximately −5.2 ppm/°C at 1275°C for 4 h, is proposed as a suitable candidate material for microwave applications requiring low dielectric loss.