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Enhanced mechanical, dielectric, and microwave absorption properties of ZnO/ZrSiO 4 composite ceramics by adding Al 2 O 3 powders
Author(s) -
Liu Yi,
Luo Fa,
Su Jinbu,
Zhou Wancheng,
Zhu Dongmei
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431291
Subject(s) - materials science , ceramic , microwave , reflection loss , dielectric , composite material , permittivity , composite number , absorption (acoustics) , sintering , dielectric loss , flexural strength , optoelectronics , telecommunications , computer science
The ZnO/ZrSiO 4 composite ceramics with different Al 2 O 3 additions are fabricated by pressureless sintering method. The addition of Al 2 O 3 contributes to the formation of ZnAl 2 O 4 , which results in the enhancement of bulk densities as well as flexural strengths of the ceramics by promoting the mass transportation movement. Both the complex permittivity and dielectric loss increase firstly then decrease as the Al 2 O 3 content enhances from 0 to 7 wt%. The bulk density and ZnO content are the main factors to affect the dielectric performance of the ceramics. Owing to the higher dielectric loss, the ceramic with 3 wt% Al 2 O 3 addition presents the better microwave absorption property. The effective absorption bandwidth of the ceramic in 2.4 mm thickness is 8.8–11.9 GHz, with a minimum reflection loss of −25.36 dB at 10.4 GHz. As the thickness of the ceramic increases, the absorption peak shifts toward the lower frequency region, which indicates the absorption bandwidth can be tailored by changing the thickness.