Premium
Effects of adding B 2 O 3 on microwave dielectric properties of 0.9625MgTiO 3 ‐0.0375(Ca 0.5 Sr 0.5 )TiO 3 composite ceramics
Author(s) -
Chen Chuying,
Peng Zhijian,
Xie Luzhi,
Bi Ke,
Fu Xiuli
Publication year - 2020
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.13582
Subject(s) - sintering , materials science , dielectric , ceramic , composite number , analytical chemistry (journal) , temperature coefficient , phase (matter) , microwave , mineralogy , diffraction , nuclear chemistry , composite material , optics , chromatography , chemistry , physics , optoelectronics , organic chemistry , quantum mechanics
A series of 0.9625MgTiO 3 ‐0.0375(Ca 0.5 Sr 0.5 )TiO 3 composite ceramics added with different amounts of B 2 O 3 (1‐5 wt%) were prepared via the solid state sintering method using the pre‐synthesized raw MgTiO 3 and (Ca 0.5 Sr 0.5 )TiO 3 powders by molten‐salt reaction. The sintering temperature of 0.9625MgTiO 3 ‐0.0375(Ca 0.5 Sr 0.5 )TiO 3 composite ceramics can be reduced from 1275°C to 1175°C due to the liquid phase sintering effect of B 2 O 3 . When the adding amount of B 2 O 3 was more than 2 wt%, a new phase MgTi 2 O 5 could be detected by X‐ray diffraction, which would substantially degrade the dielectric properties of the obtained ceramics. Resultantly, the quality factor ( Q · f ) and dielectric constant ( ε r ) of the samples increase first and decrease later with increasing addition amount of B 2 O 3 . In addition, the temperature coefficient of resonant frequency ( τ f ) progressively increases with increasing content of B 2 O 3 . By sintering at 1175°C for 4 hours, the obtained 0.9625MgTiO 3 ‐0.0375Ca 0.5 Sr 0.5 TiO 3 composite ceramics with 2 wt% B 2 O 3 possess the optimal microwave dielectric properties of ε r = 18.9, Q·f = 57 000 GHz and τ f = −1.2 ppm/°C.