TITLE

Observation of an anomalous correlation between permittivity and tunability of a doped (Ba,Sr)TiO3 ferroelectric ceramic developed for microwave applications

AUTHOR(S)
Kozyrev, Andrey B.; Kanareykin, Alexei D.; Nenasheva, Elizaveta A.; Osadchy, Vitaly N.; Kosmin, Dmitry M.
PUB. DATE
July 2009
SOURCE
Applied Physics Letters;7/6/2009, Vol. 95 Issue 1, p012908
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Anomalous dependencies of the dynamic (pulse) and static tunability [k(U)=C(0)/C(U)] as a function of permittivity ([variant_greek_epsilon]) were observed in ferroelectric varactors based on doped paraelectric state (Ba,Sr)TiO3 ceramics. The reduction of the relatively high permittivity value from [variant_greek_epsilon]≅810 down to [variant_greek_epsilon]≅260 by introducing various proportions of a Mg2TiO4 additive resulted in a 20% increase in tunability. Furthermore, ceramics with this additive have demonstrated dynamic tunability noticeably higher than the static tunability, also unexpected for this type of material.
ACCESSION #
43158447

 

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