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The Li 2 O–Nb 2 O 5 –TiO 2 Composite Microwave Dielectric Ceramics with Adjustable Permittivities
Author(s) -
Zeng Qun,
Li Wei,
Shi Jianlin,
Dong Xianlin,
Guo Jingkun
Publication year - 2008
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.1551-2916.2007.02156.x
Subject(s) - ceramic , materials science , dielectric , composite number , sintering , phase (matter) , analytical chemistry (journal) , microwave , permittivity , microstructure , mineralogy , composite material , chemistry , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics
A group of new y M‐phase/(1− y ) Li 2+ x Ti 1−4 x Nb 3 x O 3 composite ceramics with adjustable permittivities for low‐temperature co‐fired ceramic applications was initially investigated in the study. The 0.5 M‐phase/0.5 Li 2+ x Ti 1−4 x Nb 3 x O 3 ( x =0.01, 0.02, 0.04, 0.06, 0.081) composite ceramics were first investigated to find the appropriate “Li 2 TiO 3 ss” composition ( x value). The best dielectric properties of ɛ r =40.1, Q × f values up to 9318 GHz, τ f =25 ppm/°C, were obtained for the ceramics composites at x =0.02. Based on the good dielectric properties, the suitable “Li 2 TiO 3 ss” composition with x =0.02 was mixed with the Li 1.0 Nb 0.6 Ti 0.5 O 3 powder as the ratio of y “M‐phase”/(1− y ) “Li 2 TiO 3 ss” ( y =0.2, 0.4, 0.5, 0.6, 0.8). By adjusting the y values, the group of composite ceramics could exhibit largely are adjustable permittivities varying from ∼20 to ∼60, while Q × f and τ f values relatively good. Nevertheless, in this study, because there are interactions between the M‐phase and Li 2 TiO 3 ss during sintering process, their microwave dielectric properties could not be predicted precisely by the empirical model.