论文部分内容阅读
应用环境扫描电子显微术 (ESEM)和同步辐射X射线白光形貌术研究了 92 %Pb(Zn1 / 3Nb2 / 3)O3-8%PbTiO3(PZN -8%PT)晶体的表面形貌和缺陷 ,为生长高质量的该单晶材料提供重要的参考。从晶体自然显露面 (111)面的ESEM缺陷形貌像中 ,观察并研究了诸如生长丘、位错蚀坑、小角晶界、包裹物、空洞或裂缝等生长缺陷 ,并分析了导致这些缺陷出现的原因是生长过程中的温度波动、过快的降温速率等因素。从该晶体的同步辐射X射线白光形貌像中也观察到了包裹物或空洞等缺陷。由该晶体表面出现的直形台阶、多层板块状台阶结构及其精细结构的ESEM形貌像可知 ,在PZN -8%PT晶体的高温溶液法生长中 ,起主导作用的生长机制为二维成核层状生长机制
The surface morphologies and defects of 92% Pb (Zn1 / 3Nb2 / 3) O3-8% PbTiO3 (PZN -8% PT) crystals were investigated by scanning electron microscopy (ESEM) and synchrotron radiation X-ray , Which provides an important reference for the growth of high quality single crystal material. Growth defects such as growth mounds, dislocation pits, small-angle grain boundaries, inclusions, voids, or cracks were observed and studied from the ESEM defect topography of the natural exposed surface (111) of the crystal, and the defects that led to these defects Appears because of the growth process of temperature fluctuations, excessive cooling rate and other factors. From the crystal of synchrotron radiation X-ray white morphology also observed defects such as wrapping or empty. From the appearance of the crystal surface of the straight step, multi-layer block-like stepped structure and the fine structure of the ESEM morphology shows that in PZN -8% PT crystal growth of solution temperature, the dominant growth mechanism for the two-dimensional Nucleation Layered growth mechanism