HIGH-PRESSURE RAMAN INVESTIGATION OF HIGH INDEX FACETS BOUNDEDα-Fe2O3PSEUDOCUBIC CRYSTALS.
M Junaid BushiriDivya Neravathu GopiVirginia MonteseguroJuan Angel Sans TresserrasPublished in: Journal of physics. Condensed matter : an Institute of Physics journal (2020)
High index facet bounded α-Fe2O3pseudocubic crystals has gained the attention of the scientific community due to its promising electrochemical sensing response towards aqueous ammonia. The structural stability of α-Fe2O3pseudocubic crystals is investigated through high-pressure Raman spectroscopy up to 22.2 GPa, and those results are compared with ourab-initiotheoretical calculations. The symmetry of the experimental Raman-active modes has assigned by comparison with theoretical data. In addition to the Raman-active modes, two additional Raman features are also detected, whose intensity increases with compression. The origin of these two additional peaks addressed in this study, reveals a strong dependence on the geometry and the low dimensionality as the most plausible explanation.
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