坩埚下降法生长弛豫铁电晶体PIMNT的单晶性表征

Mono-crystallinity Characterization of Relaxor-based Ferroelectric Crystal PIMNT Grown by Bridgman Process

采用固相合成法制备PIMNT多晶料,通过垂直坩埚下降法生长出大尺寸PIMNT晶体;从晶体原坯不同部位切取系列晶片,应用X射线衍射旋转定向测试法,获得这些晶片的常规扫描图和蝴蝶图,从而对PIMNT晶体的单晶性做出分析表征。X射线粉末衍射分析表明PIMNT晶体为钙钛矿结构,系列晶片的常规扫描图显示整个晶体轴向自下至上均呈[111]结晶学方向,其蝴蝶图所示晶体的取向分散度为1.2°-1.5°,这些结果证实了所生长PIMNT晶体的单晶性。

Using PIMNT polycrystalline material prepared by solid state method,large size PIMNT crystals were grown by vertical Bridgman process.A series of crystal wafers fabricated from different locations of the crystal boule were measured by the rotating orientation XRD method.By means of the normal scan pattern and butterfly diagram,the single-crystallization of PIMNT crystals was characterized.PIMNT crystal is verified to be perovskite structure by X-ray powder diffraction analysis.The axial direction of the whole crystal boule is parallel to crystalline orientation.The butterfly diagrams show that the crystalline orientation dispersion of the crystal is limited in the range of 1.2°-1.5°.All these results indicate that a mono-crystallinity has been acquired in PIMNT crystal grown in this work.