Amphoteric doping of praseodymium Pr3+ in SrTiO3 grain boundaries

H. Yang, H. S. Lee, P. G. Kotula, Y. Sato, Y. Ikuhara, N. D. Browning

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Charge compensation in rare-earth Praseodymium (Pr3+) doped SrTiO3 plays an important role in determining the overall photoluminescence properties of the system. Here, the Pr3+ doping behavior in SrTiO3 grain boundaries (GBs) is analyzed using aberration corrected scanning transmission electron microscopy. The presence of Pr3+ induces structural variations and changes the statistical prevalence of the GB structures. In contrast to the assumption that Pr3+ substitutes on the Sr site in the bulk, Pr3+ is found to substitute on both Sr and Ti sites inside the GBs, with the highest concentration at the Ti sites. This amphoteric doping behavior in the boundary plane is further confirmed by first principles theoretical calculations.

Original languageEnglish
Article number121904
JournalApplied Physics Letters
Issue number12
Publication statusPublished - Mar 23 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Yang, H., Lee, H. S., Kotula, P. G., Sato, Y., Ikuhara, Y., & Browning, N. D. (2015). Amphoteric doping of praseodymium Pr3+ in SrTiO3 grain boundaries. Applied Physics Letters, 106(12), [121904].