Investigation on microwave dielectric properties of new low-loss CoZrTa^sub 2^O^sub 8^ ceramics

New ceramics with CoZrTa2O8 formula were prepared by conventional solid-state reaction method. The phase composition of all sintered samples was confirmed as a single phase with monoclinic wolframite structure belonged to the P2/c space group. The grain growth was analyzed through the investigation...

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Bibliographic Details
Published inMaterials letters Vol. 231; p. 1
Main Authors Wang, Ying, Zhang, Shao-Bo, Tang, Tian-Liang, Xia, Wang-Suo, Shi, Li-Wei
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier BV 15.11.2018
Subjects
Ceramics
Density
Dielectric loss
Dielectric properties
Grain growth
Materials science
Microwaves
Phase composition
Porosity
Resonant frequencies
Sintering
Sintering (powder metallurgy)
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Summary:New ceramics with CoZrTa2O8 formula were prepared by conventional solid-state reaction method. The phase composition of all sintered samples was confirmed as a single phase with monoclinic wolframite structure belonged to the P2/c space group. The grain growth was analyzed through the investigation of relative density and grain size. The dielectric constant (εr) was discussed with relative density, polarizability and porosity. The quality factors (Q × f) were analyzed by considering grain growth and atomic packing fraction. The temperature coefficient of resonant frequency (τ ) had no significant change under different sintering temperature. The typical microwave dielectric properties of CoZrTa2O8 ceramics were εr = 23.54, Q × f = 20,100 GHz, and τ  = −8.72 ppm/°C, sintered at 1250 °C for 4 h. Considering the low dielectric loss and near-zero τ value, CoZrTa2O8 ceramics should be good candidates for microwave device application.
ISSN:0167-577X
1873-4979