Enhanced Photochemical Reactivity at the Ferroelectric Phase Transition in Ba1-xSrxTiO3

被引:28
作者
Bhardwaj, Abhilasha [1 ]
Burbure, Nina V. [1 ]
Rohrer, Gregory S. [1 ]
机构
[1] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA
基金
美国国家科学基金会;
关键词
PHOTOASSISTED WATER DECOMPOSITION; OPTICAL-ABSORPTION EDGE; BARIUM-TITANATE; CATALYTIC-PROPERTIES; ELECTRONIC-STRUCTURE; CO OXIDATION; BATIO3; REDUCTION; SURFACE; POLARIZATION;
D O I
10.1111/j.1551-2916.2010.04002.x
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
Optical absorption and reflectance spectroscopy have been used to monitor the photochemical reactivity of Ba1-xSrxTiO3 solid solutions with aqueous solutions containing methylene blue. Atomic force microscopy indicates that methylene blue is reduced on the surfaces of domains that have a positive surface polarization. The results indicated that SrTiO3 and BaTiO3 have similar reactivities. As the second component is added to either of the pure materials, the reactivity decreases. However, there is a sharp maximum in reactivity at the tetragonal-to-cubic phase boundary. This is attributed to the anomalously high dielectric constant at this composition that increases the width of the space charge region and charge carrier separation in the near surface region.
引用
收藏
页码:4129 / 4134
页数:6
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