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Sintering Behavior, Structures, and Microwave Dielectric Properties of (Li x Nb 3 x )Ti 1−4 x O 2
Author(s) -
Pang LiXia,
Wang Hong,
Zhou Di,
Yao Xi
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.1551-2916.2008.02585.x
Subject(s) - materials science , rutile , sintering , tetragonal crystal system , dielectric , analytical chemistry (journal) , ceramic , solid solution , temperature coefficient , phase (matter) , mineralogy , crystallography , crystal structure , metallurgy , chemistry , composite material , optoelectronics , organic chemistry , chromatography
(Li x Nb 3 x )Ti 1−4 x O 2 (0.05≤ x ≤0.23) ceramics were synthesized by conventional solid‐state reaction method. The sintering behavior, structures, and microwave dielectric properties were investigated as a function of the content of (Li 1/4 Nb 3/4 ) 4+ substitution for Ti 4+ . Tetragonal rutile solid solutions were observed when 0.05≤ x ≤0.15, while LiNb 3 O 8 phase coexisted with rutile phase when 0.20≤ x ≤0.23. Without sintering aids, (Li x Nb 3 x )Ti 1−4 x O 2 ceramics were well densified at 960°–1020°C. Dielectric constant (ɛ r ) changed from 91 to 39 and temperature coefficient of the resonant frequency (TCF) shifted from +320.5 ppm/°C to −72.7 ppm/°C with the amount of (Li 1/4 Nb 3/4 ) 4+ substitution increasing. (Li 0.215 Nb 0.645 )Ti 0.14 O 2 ceramic sintered at 1020°C showed excellent microwave dielectric properties with ɛ r ∼43, Q × f value∼14 500 GHz and TCF∼−15 ppm/°C. The relationship between structure parameter (tetragonality ratio) and dielectric constant or/and TCF value of Li x Nb 3 x Ti 1−4 x O 2 rutile solid solutions was also studied in this work.