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Issue 46, 2018
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Negative and positive photodielectric effects in quantum paraelectric BaFe12O19 single crystals

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Abstract

The effects of light illumination on dielectric properties were investigated in ferrimagnetic quantum paraelectric BaFe12O19 single crystals. The enhancement and reduction of dielectric constants under light illumination, i.e., positive and negative photodielectric (PD) effects, were found in BaFe12O19. The high-temperature positive PD effect depends significantly on the frequency and temperature, which can be ascribed to the photo-excitation accelerated electron hopping process between Fe2+ and Fe3+. The low-temperature negative PD effect is nearly frequency-independent and is associated with non-polar tendency of the FeO5 bipyramids induced by photo-excited carriers. These findings could suggest a promising route to generate large and frequency-independent PD effects for application in photo-sensing devices.

Graphical abstract: Negative and positive photodielectric effects in quantum paraelectric BaFe12O19 single crystals

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Publication details

The article was received on 24 Sep 2018, accepted on 24 Oct 2018 and first published on 31 Oct 2018


Article type: Paper
DOI: 10.1039/C8TC04812F
Citation: J. Mater. Chem. C, 2018,6, 12707-12713

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    Negative and positive photodielectric effects in quantum paraelectric BaFe12O19 single crystals

    L. H. Yin, L. Hu, J. Yang, P. Teng, W. H. Song, J. M. Dai, X. B. Zhu and Y. P. Sun, J. Mater. Chem. C, 2018, 6, 12707
    DOI: 10.1039/C8TC04812F

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