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Phase Evolution and Microwave Dielectric Properties of (1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 Ceramics
Author(s) -
Lei Wen,
Lu WenZhong,
Liu Dan,
Zhu JianHua
Publication year - 2009
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.1551-2916.2008.02757.x
Subject(s) - ceramic , materials science , analytical chemistry (journal) , microstructure , phase (matter) , dielectric , solid solution , mineralogy , microwave , metallurgy , chemistry , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics
(1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 microwave dielectric ceramics were synthesized using the solid‐state reaction. The variation of the microstructures, phase compositions, and microwave dielectric properties of the (1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 ceramics with the amount of Mg 2 TiO 4 have been investigated. It can be observed from the XRD results that a single‐phase solid solution is formed in the (1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 ( x =0.1) ceramics, however, with the increase of x value, second‐phase MgTi 2 O 5 and MgTiO 3 appear in the (1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 ceramics between the range of 0.21≤ x ≤0.8 and 0.9≤ x ≤1.0, respectively. As the amount of Mg 2 TiO 4 increases, the ɛ r value of the (1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 ceramics increases almost linearly from 9.1 to 14.1, the Q × f value decreases initially, and then increases rapidly until it attains a maximum value of 256 810 GHz in the (1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 ( x =0.92) ceramics, while the τ f value changes slightly and remains at −(65±5) ppm/°C. When the 6 mol% CaTiO 3 and 5 mol% SrTiO 3 were added to the (1− x )ZnAl 2 O 4 − x Mg 2 TiO 4 ( x =0.21), respectively, their τ f value was successfully controlled within the range of −10≤τ f ≤10 ppm/°C, while the Q × f value reduced considerably.