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Modification of MgAl 2 O 4 Microwave Dielectric Ceramics by Zn Substitution
Author(s) -
Zheng Chang Wei,
Wu Shu Ya,
Chen Xiang Ming,
Song Kai Xin
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.1551-2916.2007.01550.x
Subject(s) - ceramic , dielectric , sintering , materials science , analytical chemistry (journal) , mineralogy , microwave , solid solution , nuclear chemistry , metallurgy , chemistry , telecommunications , chromatography , optoelectronics , computer science
MgAl 2 O 4 microwave dielectric ceramics were modified by Zn substitution for Mg, and their dielectric characteristics were evaluated, along with their structures. Dense (Mg 1− x Zn x )Al 2 O 4 ceramics were obtained by sintering at 1550°–1650°C in air for 3 h, and the (Mg 1− x Zn x )Al 2 O 4 solid solution was determined in the entire composition range. With Zn substitution for Mg, the dielectric constant ɛ of MgAl 2 O 4 just varied from 7.90 to 8.56, while the Q × f value had significantly improved up to a maximal value of 106 000 GHz at x =1.0. Moreover, the τ f of MgAl 2 O 4 ceramics had declined from −73 to −63 ppm/°C.