The phase transformation of α′-NaV2O5 has been studied by electron diffraction. It has been observed for the first time that two different types of diffuse scatterings exist; one appears slightly above Tc and the other appears already at room temperature. The former type of diffuse scattering locks into superlattice reflections at Tc. The superlattice reflections and the former type of diffuse scattering are explained by a long-period anti-phase-domain structure (LPAPDS) model and the fluctuation of its period.
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