Photochemical synthesis of AZrO3-x thin films (A=Ba, Ca and Sr) and their characterization

被引:24
作者
Cabello, G. [1 ]
Lillo, L. [1 ]
Caro, C. [1 ]
Buono-Core, G. E. [2 ]
Chornik, B. [3 ]
Flores, M. [3 ]
Carrasco, C. [4 ]
Rodriguez, C. A. [4 ]
机构
[1] Univ Bio Bio, Fac Ciencias, Dept Ciencias Basicas, Chillan, Chile
[2] Pontificia Univ Catolica Valparaiso, Inst Quim, Valparaiso, Chile
[3] Univ Chile, Fac Ciencias Fis & Matemat, Dept Fis, Santiago 8370415, Chile
[4] Univ Concepcion, Fac Ingn, Dept Ingn Mat, Concepcion, Chile
关键词
D; Perovskite; Photodeposition; Thin films; Ternary metal oxides; PHOTOLUMINESCENCE EMISSION; STRUCTURAL REFINEMENT; DIELECTRIC-PROPERTIES; OPTICAL-PROPERTIES; VIOLET-BLUE; POWDERS; SRZRO3; BEHAVIOR; PHOSPHOR;
D O I
10.1016/j.ceramint.2013.12.118
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
(Ba, Ca, Sr)ZrO3-x thin films were prepared by a photochemical method using thin films of beta-diketonate complexes as precursors. The photolysis of these films induces the fragmentation of the 2,2,6,6-tetramethyl-3,5-heptanedionate ligand and the partial reduction of metal ion together with volatile organic compounds as sub-products. When the metallic complexes are irradiated in air, the final product of the reaction are ternary metal oxides. The photoreactivity of these films was monitored by FT-IR spectroscopy by a period of 72 h, followed by post-annealing at 950 degrees C. X-ray photoelectron spectroscopy and X-ray diffraction techniques were used to analyze the chemical composition and the crystalline structure of the films obtained. The results indicate that Ba, Ca, Sr, Zr and O are present in the form of perovskita, preferably adopting an amorphous structure. The surface morphology examined by atomic force microscopy revealed a rough and irregular surface. The UV-vis measurements suggest a slight increase in the optical band gap values, which promote a reduction of the intermediary energy levels or defects. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:7761 / 7768
页数:8
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