Structural XANES characterization of Ca0.99Sm0.01TiO3 perovskite and correlation with photoluminescence emission

被引：15
作者：
de Figueiredo, A. T. [2 ]
Longo, V. M. [1 ]
da Silva, R. O. [1 ]
Mastelaro, V. R. [3 ]
Mesquita, A. [3 ]
Franco, R. W. A. [4 ]
Varela, J. A. [1 ]
Longo, E. [1 ]
机构：
[1] Univ Estadual Paulista, Phys Chem Dept, LIEC, BR-14801907 Araraquara, SP, Brazil
[2] Goias Fed Univ, Dept Chem, BR-75704020 Catalao, GO, Brazil
[3] Univ Sao Paulo, Sao Carlos Phys Inst, BR-13560970 Sao Carlos, SP, Brazil
[4] Univ Estadual N Fluminen, Technol Sci Ctr, BR-28013602 Campos dos Goytacazes, RJ, Brazil
来源：
CHEMICAL PHYSICS LETTERS | 2012年 / 544卷
基金：
巴西圣保罗研究基金会; 加拿大自然科学与工程研究理事会;
关键词：
ROOM-TEMPERATURE; TRANSITIONS; SPECTRA; LUMINESCENCE; DISORDER; BATIO3; ORDER; ION; COORDINATION; ABSORPTION;
D O I：
10.1016/j.cplett.2012.06.027
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, CaTiO3:Sm (CT:Sm) were prepared by a soft chemical processing at different annealing temperatures starting with a disordered structure and reaching an ordered one, with the propose to understand the relationship between structural order-disorder and photoluminescence emission. The samples were characterized by titanium K-edge, Titanium L-II and L-III-edge XANES, electron paramagnetic resonance (EPR) and photoluminescence (PL) measurements. XANES results clearly point the presence of local distortion in [TiO6] octahedral clusters until the crystallization was completed. The interactions of the network clusters that form the CT:Sm structures provides favorable structural and electronic conditions for the appearance of PL phenomena. (C) 2012 Published by Elsevier B.V.
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页码：43 / 48
页数：6
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