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分别以硝酸镧、多聚磷酸和磷酸二氢钠为原料,在无任何添加剂和模板的条件下,采用水热法分别合成微纳米球和纳米棒两种形貌的磷酸镧。通过场发射-扫描电子显微镜(FE-SEM),X射线衍射(XRD),红外光谱(FTIR)和荧光光谱(PL)等测试手段对以上不同形貌的样品的相结构以及微观形貌进行表征。FE-SEM测试结果表明:当以多聚磷酸为磷源时,在酸性条件下可以得到平均粒径约为2μm左右的磷酸镧微球;而当以磷酸二氢钠磷源时,在酸性条件下则可以得到纳米棒;两者的分散性良好。XRD测试结果表明:两种不同形貌的样品均为单斜晶系结构。荧光光谱分析可知:Eu3+的掺杂浓度相同时,球状样品的发光强度远大于棒状样品。
Lanthanum nitrate, polyphosphoric acid and sodium dihydrogen phosphate were used as raw materials respectively to synthesize two kinds of lanthanum phosphate with hydrothermal method under the condition of no additive and template respectively. The phase structure and microstructure of the samples with different morphologies were characterized by field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR) and fluorescence spectroscopy (PL) . The results of FE-SEM test showed that lanthanum phosphate microspheres with an average particle size of about 2 μm can be obtained under acidic conditions when polyphosphoric acid is used as the phosphorus source. When using sodium phosphate monobasic phosphate source, Under the nanorods can be obtained; the dispersion of both good. XRD results show that the two samples with different morphologies are monoclinic. Fluorescence spectrum analysis shows that the luminescence intensity of the spheroidal sample is much larger than that of the rod sample when the doping concentration of Eu3 + is the same.