Low loss tunable (Ba,Sr)TiO3 ceramics utilizing intragrain concentration gradient

Igor Lubomirsky, Tzu Yu Wang, Franco Deflaviis, Oscar M. Stafsudd

Research output: Contribution to journalConference articlepeer-review


The miniaturization of electronic devices has led to a need for tunable dielectric materials. These materials must exhibit high tunability and low loss in the microwave region. We observed high tunability and low loss throughout the microwave region, from .3 MHz to 3 GHz, in (Ba,Sr)TiO3 ceramics with intragrain concentration gradients. The tunability varied slightly with frequency and was measured to be approx. 10% at 3 GHz under 10kV/cm bias and the loss tangent remained virtually unchanged, below .02 in this region. Our data is consistent with the theory of ion hopping clusters. The graded composition results in suppression of ferroelectric resonance and thus dispersion of peak dielectric loss. The concept of intragrain concentration gradient materials can lead to a variety of applications in the microwave communications field.

Original languageEnglish
Pages (from-to)319-326
Number of pages8
JournalIntegrated Ferroelectrics
Issue number1
StatePublished - 1999
Externally publishedYes
EventThe 11th International Symposium on Integrated Ferroelectrics (ISIF99) - Colorado Springs, CO, USA
Duration: 7 Mar 199910 Mar 1999


Dive into the research topics of 'Low loss tunable (Ba,Sr)TiO3 ceramics utilizing intragrain concentration gradient'. Together they form a unique fingerprint.

Cite this