perovskite atlas Structures, modes and phase transitions · Josu M. Igartua · UPV/EHU

Figure 5.16 · Thesis 3 · Iturbe 2012

Figure 5.16 · Thesis 3 · Iturbe 2012

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and Table 5.6 exhibit the temperature evolution of the amplitude of $\mathrm{GM}_{4}^{+}$, $\mathrm{X}_{3}^{+}$and $\mathrm{X}_{5}^{+}$modes, the rest are negligible, in the monoclinic and in the tetragonal phases. As mentioned, the physical interpretation of the modes taking part in the symmetry breaking is the tilting of the octahedra. In Figure 5.16 we have also shown the octahedral tilt angles (tilt systems: $\mathrm{a}^{+} \mathrm{b}^{-} \mathrm{b}^{-}\left(P 2_{1} / n\right)$ and $\mathrm{a}^{+} \mathrm{a}^{+} \mathrm{c}^{-}\left(P 4_{2} / n\right)$). The matching of the mode amplitudes and tilt angles is perfect (Figure 5.8). $\mathrm{GM}_{4}^{+}$and $\mathrm{X}_{3}^{+}$modes (rotation and inclination

and Table 5.6 exhibit the temperature evolution of the amplitude of \mathrm{GM}_{4}^{+}, \mathrm{X}_{3}^{+}and \mathrm{X}_{5}^{+}modes, the rest are negligible, in the monoclinic and in the tetragonal phases. As mentioned, the physical interpretation of the modes taking part in the symmetry breaking is the tilting of the octahedra. In Figure 5.16 we have also shown the octahedral tilt angles (tilt systems: \mathrm{a}^{+} \mathrm{b}^{-} \mathrm{b}^{-}\left(P 2_{1} / n\right) and \mathrm{a}^{+} \mathrm{a}^{+} \mathrm{c}^{-}\left(P 4_{2} / n\right)). The matching of the mode amplitudes and tilt angles is perfect (Figure 5.8). \mathrm{GM}_{4}^{+}and \mathrm{X}_{3}^{+}modes (rotation and inclination

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Thesis 3 · Iturbe 2012
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