Influence of orientation and ferroelectric domains on the photochemical reactivity of La2Ti2O7
Influence of orientation and ferroelectric domains on the photochemical reactivity of La2Ti2O7
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DOI：
10.1016/j.jeurceramsoc.2020.09.020
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发表时间：
2021
影响因子：
5.7
通讯作者：
Mingyi Zhang;P. Salvador;G. Rohrer
中科院分区：
文献类型：
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作者：
Mingyi Zhang;P. Salvador;G. Rohrer
研究了La_2Ti_2O_7的晶向和铁电畴结构对光化学反应活性的影响。电子背散射衍射被用来确定在陶瓷样品中的晶体的表面的取向，压电力显微镜被用来确定域结构，和光阴极还原银从水银硝酸盐溶液被用来评估的光化学反应性。反应性在（001）表面上最大（这是该（110）层状钙钛矿结构中的层的取向），而垂直于该取向的表面具有最小的反应性。在晶粒内观察到复杂的畴结构，但它们似乎对银的光电阴极还原没有影响，与以前对其他铁电体的观察相反。La2Ti2O7是其中晶体取向对光化学反应性的影响大于来自内部畴结构的极化的铁电氧化物的实例。
The effects of crystal orientation and ferroelectric domain structure on the photochemical reactivity of La2Ti2O7have been measured. Electron backscattered diffraction was used to determine the orientations of the surfaces of crystals in a ceramic specimen, piezo-force microscopy was used to determine the domain structure, and the photocathodic reduction of silver from an aqueous silver nitrate solution was used to evaluate the photochemical reactivity. The reactivity is greatest on (001) surfaces (this is the orientation of the layers in this (110)playered perovskite structure) while surfaces perpendicular to this orientation have the least reactivity. Complex domain structures were observed within the grains, but they appeared to have no effect on the photocathodic reduction of silver, in contrast to previous observations on other ferroelectrics. La2Ti2O7is an example of a ferroelectric oxide in which the crystal orientation has a greater influence on the photochemical reactivity than polarization from the internal domain structure.