Dielectric properties of layered perovskite Sr1-xAxBi2Nb2O9 ferroelectrics (A=La, Ca and x=0,0.1)

被引：0

作者：

Forbess, M.J. ^{[1
]}

Seraji, S. ^{[1
]}

Wu, Y. ^{[1
]}

Nguyen, C.P. ^{[1
]}

Cao, G.Z. ^{[1
]}

机构：

[1] Dept. of Mat. Sci. and Engineering, University of Washington, Seattle, WA 98195, United States

来源：

| 2000年 / American Institute of Physics Inc.卷 / 76期

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摘要：

In this letter, we report an experimental study on the influences of 10 at. % Ca2+ and La3+ doping on dielectric properties and dc conductivity of SrBi2Nb2O9 ferroelectric ceramics. All the samples were made by two-step solid-state reaction sintering at temperatures up to 1150°C for 0.5-1 h in air. X-ray diffraction analysis indicated that single-phase layered perovskite ferroelectrics were obtained and no appreciable secondary phase was found. The Curie point was found to increase from 418°C without doping to 475°C with Ca2+ doping and to 480°C with La3+ doping. Dielectric constants, loss tangent, and dc conductivity of SrBi2Nb2O9 ferroelectrics doped with Ca2+ and La3+ were studied and the relationships among doping, crystal structure, and dielectric properties were discussed. © 2000 American Institute of Physics.

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