High‐Permittivity Temperature‐Stable Ceramic Dielectrics with Low Microwave Loss
1973; Wiley; Volume: 56; Issue: 7 Linguagem: Inglês
10.1111/j.1151-2916.1973.tb12684.x
ISSN1551-2916
AutoresRichard Kell, Adrian C. Greenham, G.C.E. Olds,
Tópico(s)Layered Double Hydroxides Synthesis and Applications
ResumoThe compounds SrZrO 3 and CaZrO 3 combine high permittivity with low loss and positive temperature coefficient of permittivity. Temperature‐stable materials were produced by forming solid solutions between these zirconates and zirconates or titanates having negative coefficients. The properties of temperature‐stable compositions in the systems Ca(Zr,Ti)O 3 and (Ba,Sr)(Zr,Ti)O 3 were investigated. At 4 GHz the relative permittivities were from 29 to 35 and the loss tangents from 3 to 11×10 −4 . Both permittivity and microwave loss increased as the principal alkaline‐earth ion was changed from Ca to Sr to Ba, but the higher losses could be reduced by adding ∼1 mol% Nb or Ta. Dense fine‐grained ceramics with the properties required for microwave applications were prepared.
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