Fabrication and electrical properties of textured Sr0.53Ba0.47Nb2O6 ceramics by templated grain growth

被引:155
作者
Duran, C [1 ]
Trolier-McKinstry, S [1 ]
Messing, GL [1 ]
机构
[1] Penn State Univ, Dept Mat Sci & Engn, Mat Res Lab, University Pk, PA 16802 USA
关键词
D O I
10.1111/j.1151-2916.2000.tb01536.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Textured Sr0.53Ba0.47Nb2O6 ceramics with a relative density of >95% were fabricated using templated grain growth (TGG), Acicular KSr2Nb5O15 template particles synthesized via a molten salt process were aligned by tape casting in a mixture of solid-state-synthesized SrNb2O6 and BaNb2O6 powders. The resulting ceramics possessed strong fiber texture along the polar axis ([001]) of the strontium barium niobate. Samples with 15.4 wt% templates attained a textured fraction of 0.82 after sintering at a temperature of 1450 degrees C for 4 h. These materials showed peak dielectric constants of 7550 at 1 kHz, remanent polarizations of 13.2 mu C/cm(2), saturation polarizations of 21 mu C/cm(2) (60%-85% of the single-crystal value), piezoelectric strain coefficients of 78 pC/N (70%-85% of the single-crystal value), and room-temperature pyroelectric coefficients of 2.9 x 10(-2) mu C-.(cm(2) (.)degrees C)(-1) (52% of the single-crystal value). These results show that TGG is a viable option for accessing single-crystal properties in polycrystalline ceramics.
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页码:2203 / 2213
页数:11
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