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用化学分析法确定了Ba1-xPbxTiO3和Ca1-xPbxTiO3纳米粉料的化学组成,测定了在不同焙烧温度下试样的红外吸收光谱(IR)和X射线衍射谱(XRD),解析了价键结构的变化及归属,结合差热分析,确定了试样的晶化温度为700℃左右,比传统的固相法要低得多。并利用Scherrer公式,计算了Ba1-xPbxTiO3和Ca1-xPbxTiO3纳米晶平均粒径分别为39nm和33nm,四方相畸变度δ分别为1.0682和1.0630,讨论了纳米级粉料的粒径对低频区域特征振动谱带形状及强度的影响,结果表明用化学共沉淀法制备的粉料其均匀度、分散性等均好于固相法。
The chemical compositions of Ba1-xPbxTiO3 and Ca1-xPbxTiO3 nanopowders were determined by chemical analysis. The infrared absorption spectra and X-ray diffraction spectra (XRD) of the samples were measured at different calcination temperatures. The valence bond structures The results show that the crystallization temperature of the sample is about 700 ℃, which is much lower than the traditional solid phase method. The average particle sizes of Ba1-xPbxTiO3 and Ca1-xPbxTiO3 nanocrystals were 39nm and 33nm respectively, and the square-phase distortions δ were 1.0682 and 1.0630, respectively, using the Scherrer formula. The effects of particle size of nano-sized powders on the characteristic vibration of low frequency region The results show that the powder prepared by chemical coprecipitation method has better uniformity and dispersibility than the solid phase method.