In this work, we investigated local structures of perovskite PbCrO3, which shows a metal-to-insulator transition and ~ 10% volume collapse, by electron diffraction, high-resolution TEM, HAADF-STEM and EDX mapping experiments. It is revealed that the charge glass state is characterized as the coexisting state of the crystalline state with the cubic structure and the non-crystalline state. The crystalline state in the charge-glass state has characteristic nanodomains consisting of the modulated structure with 3ap×3 ap×3 ap in average, which gives rise to the unique diffuse scattering around the fundamental spots. Furthermore, we investigated variations of nanoscaled local structures of Pb1-xSrxCrO3 by partial substitution of Sr2+ for Pb2+ by electron diffraction and high-resolution scanning TEM experiments. It is found that Pb1-xSrxCrO3 for x = 0.2 shows the coexisting state of charge glass state and five-hold superstructure.
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