Second harmonic generation and Yb3+ cooperative emission used as structural probes in size-driven cubic-tetragonal phase transition in BaTiO3 sol-gel nanocrystals

被引：26
作者：
Amami, J
Hreniak, D
Guyot, Y
Pazik, R
Goutaudier, C
Boulon, G [1 ]
Ayadi, M
Strek, W
机构：
[1] Univ Lyon 1, CNRS, UMR 5620, F-69622 Villeurbanne, France
[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-53114 Wroclaw, Poland
来源：
JOURNAL OF LUMINESCENCE | 2006年 / 119卷
关键词：
BaTiO3; phase transitions; nanocrystals; optical probes;
D O I：
10.1016/j.jlumin.2006.01.021
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Nanocrystalline powders of 1% Yb3+-doped BaTiO3 sintered at different temperatures were obtained by the sol-gel method. The structure of the powders covering crystallite sizes from 25 to 60 nm depending on the annealing temperature (700-1200 degrees C), was determined from the Scherrer's equation. Second harmonic generation (SHG) intensity magnitude is compared in each samples of the tetragonal BaTiO3 whereas the isotropic cubic phase is detected by the absence of the SHG signal. Cooperative emission, indicating the Yb3+ ions pairs, was easily detected in the cubic phase and not seen in the ferroelectric tetragonal structure. (c) 2006 Elsevier B.V. All-rights reserved.
引用
收藏
页码：383 / 387
页数：5
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