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Raman spectroscopy, polarized microscopy and thermal measurements were used to investigate the sequence of phase transition in the lead oxide salts Pb8O5(XO4)2 (where X = As and V). For Pb8O5(AsO4)2, a second‐order phase transition is observed at 500 K. For Pb8O5(VO4)2, a second‐order and a first‐order structural phase transitions are observed at 425 and 525 K, respectively. The ferroelastic character...
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