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The effect of BaTiO 3 addition on the dielectric constant of Si 3 N 4 ceramics
Author(s) -
Liang Hanqin,
Xia Yongfeng,
Zuo Kaihui,
Yao Dongxu,
Yin Jinwei,
Zeng Yuping
Publication year - 2018
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/ijac.12862
Subject(s) - materials science , dielectric , ceramic , sintering , flexural strength , microstructure , composite material , relative density , phase (matter) , reducing atmosphere , mineralogy , analytical chemistry (journal) , metallurgy , optoelectronics , chemistry , organic chemistry , chromatography
Abstract Si 3 N 4 ceramics with different BaTiO 3 contents have been fabricated by pressureless sintering in a N 2 atmosphere at 1680°C for 2 h. Al 2 O 3 and Nd 2 O 3 were used as sintering additives to promote the densification of Si 3 N 4 ceramics. The effect of BaTiO 3 addition on the densification, mechanical properties, phase compositions, microstructure, and dielectric properties of Si 3 N 4 ceramics was investigated. The relative density and flexural strength of Si 3 N 4 ceramics increased with the addition of BaTiO 3 up to 15 wt% and then decreased, while the dielectric constant increased continuously as the BaTiO 3 contents increased. The dielectric constant of Si 3 N 4 ceramics can be tailored in the range from 8.42 to 12.96 by the addition of 5 wt%‐20 wt% BaTiO 3 . Meanwhile, these Si 3 N 4 ceramics all had flexural strength higher than 500 MPa.