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以分析纯Bi2O3、Dy2O3为原料,采用反向滴定化学共沉淀法合成前躯体.经热重-质谱分析(TG-MS),前驱体主要是由BiOOH、Dy(OH)3组成,但含有微量BiONO3、Bi2O2CO3.前驱体经过500℃煅烧3h后,X射线衍射仪(XRD)分析结果表明,得到的是单一的β-Bi0.75Dy0.25O1.5粉体,经谢乐公式计算,平均晶粒尺寸在16.02nm左右.X射线荧光光谱仪(XRF)分析结果表明,Bi/Dy摩尔比接近理论计量比.投射电子显微镜(TEM)分析结果表明,粉体颗粒尺寸小于20nm,分散性良好.通过热力学计算对沉淀反应的机理进行了探讨.
The precursors were synthesized by reversed-titration chemical coprecipitation using analytical Bi2O3 and Dy2O3 as raw materials.The precursor was mainly composed of BiOOH and Dy (OH) 3 by TG-MS, BiONO3 and Bi2O2CO3. The results of X-ray diffraction (XRD) analysis showed that the single β-Bi0.75Dy0.25O1.5 powder was calcined at 500 ℃ for 3h. The average grain size The size of which is about 16.02nm.The results of XRF analysis show that the molar ratio of Bi / Dy is close to the stoichiometric ratio.The results of TEM show that the particle size of powder is less than 20nm and the dispersity is good.According to thermodynamics The mechanism of precipitation reaction was discussed.