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In the article “Influence of orientation and ferroelectric domains on the photochemical reactivity of La₂Ti₂O₇” Mingyi Zhang, Paul A. Salvador and Gregory S. Rohrer describe how they measured the effects of crystal orientation and ferroelectric domain structure on the photochemical reactivity of La₂Ti₂O_7.*

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. *

NanoWorld™ conductive Platinum Iridium coated Arrow-EFM AFM probes were used for the Piezo-force microscopy (PFM) that was used to determine the ferroelectric domain structure on the surface. *

The ferroelectric domains on the surface were found to have irregular shapes and there was no correlation between the pattern of silver reduction and the domain shape. The results indicate that the ferroelectric polarization of La2Ti2O7 does not alter the reactivity enough to overcome the influence of the anisotropic crystal structure. *

Fig. 6 a and b from “Influence of orientation and ferroelectric domains on the photochemical reactivity of La2Ti2O7” by Mingyi Zhang et al.
A La2Ti2O7 grain imaged with different modalities. (a) a PFM out-of-plane amplitude image. (b) a PFM out-of-plane phase image. A meandering black line in (a), marked by the arrow, corresponds to a change from light to dark contrast in the phase image. The dark (light) contrast corresponds to regions with -180° (0°) phase shift. NanoWorld conductive Arrow-EFM AFM probes were used for the piezo-force microscopy.

Please have a look at the full article cited below for the full figure — Fig. 6 a and b from “Influence of orientation and ferroelectric domains on the photochemical reactivity of La2Ti2O7” by Mingyi Zhang et al.
A La2Ti2O7 grain imaged with different modalities. (a) a PFM out-of-plane amplitude image. (b) a PFM out-of-plane phase image. A meandering black line in (a), marked by the arrow, corresponds to a change from light to dark contrast in the phase image. The dark (light) contrast corresponds to regions with -180° (0°) phase shift. Please have a look at the full article cited below for the full figure

*Mingyi Zhang, Paul A. Salvador and Gregory S.Rohrer
Influence of orientation and ferroelectric domains on the photochemical reactivity of La₂Ti₂O₇
Journal of the European Ceramic Society (2020)
DOI: https://doi.org/10.1016/j.jeurceramsoc.2020.09.020

Please follow this external link to read the full article https://www.sciencedirect.com/science/article/pii/S0955221920307445

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