Effects of heat treatment and UV irradiation on the transition metal impurities in LaAlO3

D. Yamasaka, K. Tamagawa, Yoshimichi Ohki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Impurities present in LaAlO3, were identified by analyzing electron spin resonance spectra and optical absorption spectra. Especially, the effects of ultraviolet photon irradiation and thermal annealing on these spectra were studied in detail. The experimental results confirm that LaAlO3 contains Cr and Fe as impurities. They also indicate that electrons and holes are released by the irradiation of UV photons with energies higher than 4.5 eV or by the annealing in an oxidizing atmosphere at temperatures above 500 °C. The released electrons are captured by trivalent impurity ions (Fe3+ or Cr3+), while the holes are captured by trivalent vacancies of La3+ or Al3+. It is assumed that the opposite reaction is induced by the irradiation of visible light or by the annealing in a reducing atmosphere at temperatures above 500 °C.

    Original languageEnglish
    Title of host publicationProceedings of the International Symposium on Electrical Insulating Materials
    PublisherInstitute of Electrical Engineers of Japan
    Pages387-390
    Number of pages4
    ISBN (Print)9784886860743
    Publication statusPublished - 2011
    Event2011 International Conference on Electrical Insulating Materials, ISEIM 2011 - Kyoto
    Duration: 2011 Sep 62011 Sep 11

    Other

    Other2011 International Conference on Electrical Insulating Materials, ISEIM 2011
    CityKyoto
    Period11/9/611/9/11

    Fingerprint

    Transition metals
    Heat treatment
    Irradiation
    Annealing
    Impurities
    Photons
    Electrons
    Light absorption
    Vacancies
    Paramagnetic resonance
    Absorption spectra
    Ions
    Temperature
    Hot Temperature

    Keywords

    • Electron spin resonance
    • Thermal annealing
    • Transition metal
    • UV irradiation

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials

    Cite this

    Yamasaka, D., Tamagawa, K., & Ohki, Y. (2011). Effects of heat treatment and UV irradiation on the transition metal impurities in LaAlO3 In Proceedings of the International Symposium on Electrical Insulating Materials (pp. 387-390). [6826350] Institute of Electrical Engineers of Japan.

    Effects of heat treatment and UV irradiation on the transition metal impurities in LaAlO3 . / Yamasaka, D.; Tamagawa, K.; Ohki, Yoshimichi.

    Proceedings of the International Symposium on Electrical Insulating Materials. Institute of Electrical Engineers of Japan, 2011. p. 387-390 6826350.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Yamasaka, D, Tamagawa, K & Ohki, Y 2011, Effects of heat treatment and UV irradiation on the transition metal impurities in LaAlO3 in Proceedings of the International Symposium on Electrical Insulating Materials., 6826350, Institute of Electrical Engineers of Japan, pp. 387-390, 2011 International Conference on Electrical Insulating Materials, ISEIM 2011, Kyoto, 11/9/6.
    Yamasaka D, Tamagawa K, Ohki Y. Effects of heat treatment and UV irradiation on the transition metal impurities in LaAlO3 In Proceedings of the International Symposium on Electrical Insulating Materials. Institute of Electrical Engineers of Japan. 2011. p. 387-390. 6826350
    Yamasaka, D. ; Tamagawa, K. ; Ohki, Yoshimichi. / Effects of heat treatment and UV irradiation on the transition metal impurities in LaAlO3 Proceedings of the International Symposium on Electrical Insulating Materials. Institute of Electrical Engineers of Japan, 2011. pp. 387-390
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    AB - Impurities present in LaAlO3, were identified by analyzing electron spin resonance spectra and optical absorption spectra. Especially, the effects of ultraviolet photon irradiation and thermal annealing on these spectra were studied in detail. The experimental results confirm that LaAlO3 contains Cr and Fe as impurities. They also indicate that electrons and holes are released by the irradiation of UV photons with energies higher than 4.5 eV or by the annealing in an oxidizing atmosphere at temperatures above 500 °C. The released electrons are captured by trivalent impurity ions (Fe3+ or Cr3+), while the holes are captured by trivalent vacancies of La3+ or Al3+. It is assumed that the opposite reaction is induced by the irradiation of visible light or by the annealing in a reducing atmosphere at temperatures above 500 °C.

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