铌酸钾纳米结构可调控制备及力学性能研究

Structure Modulation and Mechanical Property of Nanoscale Potassium Niobate

利用简单的一步水热法,通过对反应物浓度以及矿化剂浓度的综合调控,制备了不同晶体形貌的铌酸钾纳米粉体,其具体形貌包括纳米块、针尖状、长方体、纳米线以及八面体形貌。然后,利用X射线衍射(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、选区电子衍射(SAED)和高分辨率透射(HRTEM)等表征手段对各种纳米结构的形貌、尺寸和微观结构进行了分析,研究发现铌酸钾纳米粉体的形貌直接影响其相结构。进一步使用原子力显微镜测试系统(AFM)对单根铌酸钾纳米棒进行了力学性能测试,发现其压力与位移成线性关系。

In this paper, lead-free potassium niobate (KNbO3) nanopowders with different morphologies including the nanoblock, needleshaped,nanowire and octahedron were prepared via a simple hydrothermal method. Their as-prepared samples were then examined by XRD, SEM, TEM, SAED and HRTEM. The results show that the crystallization, morphologies and phase structure of the hydrothermal synthesized KNbO3 can be controlled by simply regulating the mineralizer concentration and the reactant concentration. It is suggested that the morphology of potassium niobate nanopowder directly influences the phase structure. Further, the mechanical performance analysis of the single-crystalline KNbO3 nanorods by an atomic force microscope (AFM) finds the linear relationship between force and displacement.