Fabrication and electrical properties of textured Sr0.53Ba0.47Nb2O6 ceramics by templated grain growth
Fabrication and electrical properties of textured Sr0.53Ba0.47Nb2O6 ceramics by templated grain growth
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DOI：
10.1111/j.1151-2916.2000.tb01536.x
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发表时间：
2000-09-01
影响因子：
3.9
通讯作者：
Messing, GL
中科院分区：
文献类型：
--
作者：
Duran, C;Trolier-McKinstry, S;Messing, GL
采用模板晶粒生长法（TGG）制备了相对密度为bbb95 %的织构Sr0.53Ba0.47Nb2O6陶瓷，并将熔融盐法合成的针状KSr2Nb5O15模板颗粒在固态合成的SrNb2O6和BaNb2O6粉末的混合物中通过胶带浇铸排列。所得陶瓷沿着铌酸锶钡的极轴（[001]）具有很强的纤维织构。15.4 wt%模板的样品在1450℃烧结4小时后，织构分数为0.82。这些材料在1 kHz时的峰值介电常数为7550，剩余极化为13.2 μ C/cm(2)，饱和极化为21 μ C/cm(2)（单晶值的60%-85%），压电应变系数为78 pC/N（单晶值的70%-85%），室温热释电系数为2.9 × 10(-2) μ C-。(cm（2)（.）℃）（-1）（单晶值的52%）这些结果表明，TGG是获得多晶陶瓷单晶性能的可行选择。
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.