低温合成NaTaO_3纳米微粒

SYNTHESIS OF NaTaO_3 NANOPARTICLES AT LOW TEMPERATURE

以草酸钠和氢氧化钽为原料,少量水为溶剂,在红外灯下充分研磨烘干后得到前驱体。利用热重分析(TG)技术对前驱体进行分析。将制备的前驱体分别在500℃、600℃、700℃、800℃下焙烧3 h,得到的产物均为单相的NaTaO3粉体。通过X-射线衍射仪(XRD)、扫描电镜(SEM)及FTIR对产物进行表征。在500℃焙烧下得到的NaTaO3粉体,XRD分析计算其晶粒直径为43 nm,通过扫描电镜(SEM)证实其颗粒小于100 nm。在FT-IR谱图中615cm-1处存在Ta-O键的特征吸收峰,经紫外-可见漫反射光谱(UV-Vis)表征、计算得出NaTaO3粉体的能隙为3.96 eV。

The precursor was obtained by grinding sodium oxalate and tantalum hydroxide in small amount of water and drying.The precursor was analyzed by thermogravimetric（TG） analysis.NaTaO3 single-phase powder was obtained by calcining the precursor at 500 ℃,600 ℃,700 ℃ and 800 ℃ for 3 hours.They were all characterized by x-ray diffraction,scanning electron microscopy（SEM） and FTIR.The size of the particles calcined at 500 ℃ is 43 nm calculated by XRD analysis.The SEM determination shows that the size of the particles calcined at 500 ℃ is less than 100 nm.The characteristic absorption at 615cm is assigned to Ta-O band in FT-IR spectra.The energy gap of NaTaO3 calculated by UV-Vis is 3.96eV.