Quasi-Debye microwave loss in Perovskite ferroelectrics
A strong de electric field dependence of the dielectric permittivity makes perovskite ferroelectrics promising materials for tunable microwave devices like phase shifters, tunable resonators, tunable filters etc. Dielectric loss is a crucial parameter for these applications. It has been recently realized that the so-called quasi-Debye loss mechanism related to local or global violation of central symmetry of materials plays a important;.,I the total balance of microwave loss. This mechanism controls the increasing dc field dependence of microwave loss in high-quality ferroelectric materials. The present paper reports on modeling oil the quasi-Debye loss mechanisms in SrTiO3 and KTaO3 systems. it is concluded that the contribution of this mechanisms is large enough to affect the performance of ferroelectric-based tunable microwave devises.
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Tagantsev, AK Ecole Polytech Fed Lausanne, Ceram Lab, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, Ceram Lab, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland
Cited References Count:13
Record created on 2006-08-21, modified on 2016-08-08