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Title of article :
Enhanced spontaneous polarization in Sr and Ca co-doped BaTiO3 ceramics
Author/Authors :
Cheng، نويسنده , , Xiaorong and Shen، نويسنده , , Mingrong، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
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Abstract :
The dielectric and ferroelectric properties of (BaxSr1−x)0.77Ca0.23TiO3 ceramics with x = 1 to 0.7 were studied and compared with those of BaxSr1−xTiO3 and Ba0.77Ca0.23TiO3 ceramics. It has been found that Sr doping of the Ba0.77Ca0.23TiO3 ceramics causes a drastic decrease of the Curie temperature, just like Sr doping of pure BaTiO3 ceramics, demonstrating a cell volume effect. However, the (BaxSr1−x)0.77Ca0.23TiO3 ceramics with x = 0.9 and 0.8 have larger spontaneous polarization than those of the corresponding BaxSr1−xTiO3 and Ba0.77Ca0.23TiO3 ceramics, along with sufficient insulating properties. The enhancement of their polarization was explained by the increase of the lattice parameter c / a ratio due to the lattice distortion and strain developed in the ceramics.
Keywords :
A. (BaxSr1?x)0.77Ca0.23TiO3 , A. Ceramic , D. Ferroelectric properties , D. Polarization
Journal title :
Solid State Communications
Journal title :
Solid State Communications
Serial Year :
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