The effects of crystal orientation and ferroelectric domain structure on the photochemical reactivity of La₂Ti₂O₇ have 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)_p layered 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. La₂Ti₂O₇ is 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.

测量了晶体取向和铁电畴结构对La ₂ Ti ₂ O ₇的光化学反应性的影响。使用电子背散射衍射确定陶瓷样品中晶体表面的方向，使用压电显微镜确定畴结构，并使用硝酸盐水溶液中的银进行光阴极还原来评估光化学反应性。在（001）表面上的反应性最大（这是（110）_p中各层的方向层状钙钛矿结构），而垂直于该方向的表面具有最低的反应性。在晶粒内观察到了复杂的畴结构，但与先前在其他铁电体上的观察结果相反，它们似乎对银的光阴极还原没有影响。La ₂ Ti ₂ O ₇是铁电氧化物的一个例子，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。