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. 2023 Nov 27;50(4):36. doi: 10.1007/s00269-023-01260-7

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Fig. 2 — IR line broadening (δΔcorr^dis) due to disordering (black diamonds) from the low wavenumber region and enthalpy (ΔH^dis) of disordering (red squares) plotted against temperature. The solid line represents the tricritical Landau description of Carpenter et al. (1990a). The broken line is a visual guide for short-range behaviour. The blue circle is ΔH^dis of the naturally ordered sample calculated by the DFT method. The green circle at 1623 K is ΔH^dis measured by Wood et al. (1980) plus ΔH^dis of the naturally ordered omphacite sample