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

D. Yamasaka, K. Tamagawa, Y. 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 2011 International Conference on Electrical Insulating Materials, ISEIM 2011
PublisherInstitute of Electrical Engineers of Japan
Pages387-390
Number of pages4
ISBN (Print)9784886860743
Publication statusPublished - 2011 Jan 1
Event2011 International Conference on Electrical Insulating Materials, ISEIM 2011 - Kyoto, Japan
Duration: 2011 Sep 62011 Sep 11

Publication series

NameProceedings of the International Symposium on Electrical Insulating Materials

Conference

Conference2011 International Conference on Electrical Insulating Materials, ISEIM 2011
CountryJapan
CityKyoto
Period11/9/611/9/11

Keywords

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

ASJC Scopus subject areas

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

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  • 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 2011 International Conference on Electrical Insulating Materials, ISEIM 2011 (pp. 387-390). [6826350] (Proceedings of the International Symposium on Electrical Insulating Materials). Institute of Electrical Engineers of Japan.