用水热法合成了稀土钛酸盐ReNaTi2O6（Re＝Ce，Nd和Eu），对其进行了XRD、SEM、XPS和151EuMossbauer表征．晶化条件（如矿化剂和初始摩尔浓度等）决定产物的结构类型和纯度．在晶化过程中钠离子占据到钙钛矿格位没有造成Ti离了价态还原.CeNaTi2O6的Ce3d5／2主峰位结合能为885.45eV，这表明CeNaTi2O6中Ce离子主要以Ce（Ⅲ）形式存在.NdNaTi2O6具有更规则的晶型.EuNaTi2O6中晶场贡献大于二级4f贡献．和固相反应法相比，水热产物中缺陷浓度较低，晶格畸变度较小．
Hydrothermally synthesized ReNaTi2O6(Re=Ce, Nd and Eu) were characterized by means of XRD, SEM, XPS and 151Eu Mossbauer
spectroscopy. The results show that the crystallization conditions e.g., the mineralizer, initial molar concentration and so on determine the structural
types and the purity of the resulting products. During the hydrothermal crystallization, sodium ions may occupy the perovskite lattice but do not result in the reduction
of Ti(IV) to lower valence state. The binding energy for the main peak of Ce3d5/2 in CeNaTi2O6 is 885.45eV, suggesting that the cerium ions exist mainly as Ce(III). NdNaTi2O6 has regular grain shape. For EuNaTi2O6,
the contribution from the lattice field is larger than that of second 4f. The products from hydrothermal conditions have lower defect concentration and smaller
lattice distortion.
参考文献
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