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We show the destruction of a displacement of Ti in the short‐range structure by observing the disappearance of emission and Raman signals when the Er3+ concentration exceeds 7 mol% in sol–gel‐derived Pb0.8La0.2TiO3 polycrystalline films. It is believed that there always exists disorder due to displacement of B ions in the skeleton of BO6 in perovskite ABO3 materials. This disorder due to the displacement...
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