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

Figure 6.9 · Thesis 4 · Orayech 2015

Figure 6.9 · Thesis 4 · Orayech 2015

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Variation with temperature of the lattice parameters for $\mathrm{La}_{2} \mathrm{CoMnO}_{6}$, as obtained from the NPD (2-300 K)(dimmed black symbols) and XRPD (300-1600 K) data refinements. In the studied temperature range $(2-1600 \mathrm{K})$, the compound undergoes two phase transitions: first-order one, discontinuous, at $\simeq 450$ K transforming the cell from a monoclinic to a trigonal; and a second one of the second-order occurring at $\simeq 1520 \mathrm{K}$ from a trigonal to a non-distorted cell, cubic. The phase-transition sequence is the following: $P 2_{1} / n \rightarrow R \overline{3} \rightarrow F m \overline{3} m$.

Variation with temperature of the lattice parameters for \mathrm{La}_{2} \mathrm{CoMnO}_{6}, as obtained from the NPD (2-300 K)(dimmed black symbols) and XRPD (300-1600 K) data refinements. In the studied temperature range (2-1600 \mathrm{K}), the compound undergoes two phase transitions: first-order one, discontinuous, at \simeq 450 K transforming the cell from a monoclinic to a trigonal; and a second one of the second-order occurring at \simeq 1520 \mathrm{K} from a trigonal to a non-distorted cell, cubic. The phase-transition sequence is the following: P 2_{1} / n \rightarrow R \overline{3} \rightarrow F m \overline{3} m.

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Thesis 4 · Orayech 2015
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