Anisotropy on SrTiO3 templated textured PMN–PT monolithic ceramics
Anisotropy on SrTiO3 templated textured PMN–PT monolithic ceramics
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DOI：
10.1016/j.jeurceramsoc.2006.10.011
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发表时间：
2007
影响因子：
5.7
通讯作者：
E. Andreeta;H. F. L. D. Santos;M. Andreeta;M. Lente;D. Garcia;A. Hernandes;J. Eiras
中科院分区：
文献类型：
--
作者：
E. Andreeta;H. F. L. D. Santos;M. Andreeta;M. Lente;D. Garcia;A. Hernandes;J. Eiras
本文首次将模板生长(TGG)和反应模板生长(RTGG)织构技术与单轴热压技术相结合，制备了高密度的0.6PMN-0.4PT单片织构陶瓷。织构陶瓷的微观结构分析表明，TGG和RTGG织构方法都能有效地促进SrTiO_3单晶模板周围的各向异性晶核。结构数据表明，虽然RTGG样品中没有先前的粉末反应生成NbO4-PT化合物，陶瓷相为100%的钙钛矿结构，但RTGG织构技术比TGG更具吸引力。相反，在与模板轴平行和垂直的RTGG样品中进行的介电表征显示，RTGG样品的电介电常数具有高的各向异性(1.48)，与0.62PMN-0.38PT单晶的估计值相当。RTGG样品的压电性表征结果表明，应变水平最高可达0.34%，d33系数最高可达1100pC/N，与随机陶瓷相比有显著提高。
In this work, templated grain growth (TGG) and reactive templated grain growth (RTGG) texture techniques combined with uniaxial hot pressing were used for the first time to produce high dense monolithic textured 0.6PMN–0.4PT ceramics. Microstructural analysis of the textured ceramics showed that both TGG and RTGG texture methods are efficient to promote anisotropic grain nucleation around the SrTiO3single crystal templates. The structural data remarkably revealed that although there was no previous reaction of the powder to form the lead magnesium niobate–lead titanate (PMN–PT) compound in the RTGG samples and the ceramic phase formation was 100% perovskite indicating that RTGG texture technique is more attractive than TGG in the case of SrTiO3templated PMN–PT. Rather, dielectric characterizations performed in the RTGG samples parallel and perpendicular to the template axis revealed a high anisotropy in the electrical permittivity for RTGG samples (1.48) that were comparable to an estimated value for 0.62PMN–0.38PT single crystals. Piezoelectric characterization of RTGG samples resulted in strain levels up to 0.34% and the highest d33coefficient was 1100pC/N, which showed significant increase compared to random ceramic.