Photoluminescence investigations on the nanoscale phase transition in Pb(Mg1/3Nb2/3)O3 |
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Authors: | V Sivasubramanian R Kesavamoorthy |
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Institution: | a Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102, India b Department of Physics, Indian Institute of Technology, Chennai-600 036, India |
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Abstract: | The temperature dependence of the photoluminescence spectra of the relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 has been reported. The temperature behaviours of the 1.57, 1.67 and 1.73 eV bands indicate a phase transition at 110 K. This is attributed to a structural phase transition in the charged nanoshell. Analysis of the temperature dependence of 1.67 eV band intensity with a thermal quenching model indicated the existence of a phonon mode at 1153 cm−1. This mode is identified in the Raman spectra measurement. The intensity of the 1.73 eV band showing an anomalous behaviour at 210 K is attributed to a transition from a crystalline phase to an amorphous phase in the charged nanoshell. |
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Keywords: | 77 84 Dy 78 55 Hx 61 10 -i |
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