无机材料学报

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稀土钛酸盐复合氧化物的水热合成和微结构特征研究

李广社a,c; 李莉萍b; 汪敏强a; 冯守华c; 姚熹a   

  1. a西安交通大学电子材料研究所; 710049; b吉林大学物理系凝聚态物理教研室 长春 130023; c 吉林大学化学系无机合成与制备化学开放实验室; 长春130023
  • 收稿日期:1998-06-01 修回日期:1998-06-26 出版日期:1999-04-20 网络出版日期:1999-04-20

Hydrothermal Synthesis and Microstructural Characteristics of Rare Earth Titanates

LI Guang-Shea,c; LI Li-Pingb; WANG Min-Qianga; FENG Shou-Huac; YAO Xiaa   

  1. aElectronic Material Research Laboratory; Xi an Jiaotong University Xi an 710049 China; bPhysics Department; Jilin University Changchun 130025 China; cKey Laboratory of Inorganic synthesis and Preppartive Chemistry, Jilin University Changchun 130023 China
  • Received:1998-06-01 Revised:1998-06-26 Published:1999-04-20 Online:1999-04-20

摘要: 用水热法合成了稀土钛酸盐ReNaTi2O6Re=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.

关键词: 水热法, 双钙钛矿, Mssbauer谱

Abstract: 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.

Key words: hydrothermal route, double peroskite, Mossbauer spectra

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