Journalartikel

Jahr der Veröffentlichung: 2021

Seiten: 6903-6913

Zeitschrift: Physical Chemistry Chemical Physics

Bandnummer: 23

Heftnummer: 11

ISSN: 1463-9076

eISSN: 1463-9084

DOI Link: https://doi.org/10.1039/d1cp00176k

Verlag: Royal Society of Chemistry

Abstract: 
Square-shaped Ce0.8Gd0.2O2 (GDC) membranes are prepared by microstructuring techniques from (111)-oriented, polycrystalline GDC thin films. The strain state of the membranes is investigated by micro-Raman mapping using polarized excitation light. Using circularly polarized excitation, the maps of the Raman shifts reveal circular contour lines in concordance with the quadratic shape of the membrane and with optical investigations of the residual strain distribution. In contrast, asymmetric contours of the maps of the Raman shifts exhibiting a two-fold symmetry are found when using linearly polarized excitation. The contour plots for a linear polarization perpendicular or parallel to the local curvature are rotated by 90 degrees. This behavior is caused by the polarization dependence of three overlapping Raman modes arising from the splitting of the triply degenerate F-2g mode due to strain. The contribution of their Raman intensity to the overall Raman signal depends on the measurement geometry and the polarization of the incoming and scattered light. Varying the polarization of the incoming excitation light results in different averaging of the Raman-active modes contributing to the broad Raman signal observed. These results clearly demonstrate that polarization-dependent Raman measurements have the potential to yield additional insight into the local strain distribution in free-standing oxide membranes.

Harvard-Zitierstil: Konetschny, A., Weinhold, M., Heiliger, C., Elm, M. and Klar, P. (2021) Polarization-dependence of the Raman response of free-standing strained Ce_0.8Gd_0.2O₂ membranes, Physical Chemistry Chemical Physics, 23(11), pp. 6903-6913. https://doi.org/10.1039/d1cp00176k

APA-Zitierstil: Konetschny, A., Weinhold, M., Heiliger, C., Elm, M., & Klar, P. (2021). Polarization-dependence of the Raman response of free-standing strained Ce_0.8Gd_0.2O₂ membranes. Physical Chemistry Chemical Physics. 23(11), 6903-6913. https://doi.org/10.1039/d1cp00176k