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.


Published in:
Integrated Ferroelectrics, 39, 1-4, 1201-1210
Year:
2001
ISSN:
1058-4587
Keywords:
Note:
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
508BF
Times Cited:3
Cited References Count:13
Laboratories:




 Record created 2006-08-21, last modified 2018-03-17


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