Preparation of nano-particles LiTaO3 powders by the polymeric precursor method
Lithium tantalate (LiTaO3) nano-powders with Li/Ta= 1:1 stoichiometry were synthesized by the polymeric precursor method. The desired metal cations were chelated in an aqueous solution with citric acid as chelating agent and ethylene glycol as etherification agent. The thermal decomposition of the precursor gels were studied by thermogravimetry-differential thermal analysis (TG/DTA). The phase transformation of LiTaO3 powders with different calcinating temperatures were studied by X-ray diffraction (XRD). The scanning electron microscope （SEM） images were taken in order to estimate the size and show the surface morphology of the LiTaO3 powders. The influence of two test routes on surface morphology and grain size of the powders was sutdied. Homogeneous precursor solution and gels with no precipitate can be achieved at the test routeⅠ. The results reveal that the precursor gels heat treated at 600℃, the corresponding XRD data exhibit diffraction peaks belonging to the formation of LiTaO3, which suggests the beginning of crystallization. A pure nano-powders LiTaO3 with fine average grain size of ～50nm are achieved from precursor gels calcined at 700℃.
LiTaO3 powders Polymeric precursor method Precursor gels
权茂华 张建新 赵连城 赵九蓬
哈尔滨工业大学材料科学与工程学院 哈尔滨工业大学应用化学系,哈尔滨 150001
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）