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Low‐Temperature Firing and Microwave Dielectric Properties of Ca[(Li 1/3 Nb 2/3 ) 0.84 Ti 0.16 ]O 3−δ Ceramics for LTCC Applications
Author(s) -
Tong JianXi,
Zhang QiLong,
Yang Hui,
Zou JiaLi
Publication year - 2007
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.1551-2916.2006.01461.x
Subject(s) - materials science , dielectric , microstructure , ceramic , sintering , phase (matter) , stoichiometry , analytical chemistry (journal) , perovskite (structure) , volatilisation , mineralogy , lithium (medication) , composite material , chemical engineering , chemistry , optoelectronics , organic chemistry , chromatography , engineering , endocrinology , medicine
The effects of LiF and ZnO–B 2 O 3 –SiO 2 (ZBS) glass combined additives on phase composition, microstructures, and microwave dielectric properties of Ca[(Li 1/3 Nb 2/3 ) 0.84 Ti 0.16 ]O 3−δ (CLNT) ceramics were investigated. The LiF and ZBS glass combined additives lowered the sintering temperature of CLNT ceramics effectively from 1150° to 880°C. The main diffraction peaks of all the specimens split due to the coexistence of the non‐stoichiometric phase (A) and stoichiometric phase (B), which all possess CaTiO 3 ‐type perovskite structures. The transformation from A into B became accelerated with the increase of LiF or ZBS content. ZBS glass restrained the volatilization of lithium salt, which greatly affected the microstructures and microwave dielectric properties. CLNT ceramics with 2 wt% LiF and 3 wt% ZBS sintered at 900°C for 2 h show excellent dielectric properties: ɛ r =34.3, Q × f =17 400 GHz, and τ f =−4.6 ppm/°C. It is compatible with Ag electrodes, which makes it a promising ceramic for low‐temperature cofired ceramics technology application.