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Amphoteric Doping of Praseodymium Pr3+ in SrTiO3 Grain Boundaries

Journal Article · · Applied Physics Letters, 106(12):Article No. 121904
DOI:https://doi.org/10.1063/1.4916223· OSTI ID:1182940

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 (STEM). The presence of Pr3+ induces structure variations and changes the statistical prevalence of GB structures. In contrast to the assumption that Pr3+ substitutes for A site as expected in the bulk, Pr3+ is found to substitute both Sr and Ti sites inside GBs with the highest concentration in the Ti sites. This amphoteric doping behavior in the boundary plane is further confirmed by first principles theoretical calculations.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1182940
Alternate ID(s):
OSTI ID: 1226726
OSTI ID: 22398769
OSTI ID: 1238591
Report Number(s):
PNNL-SA-108176; 47296
Journal Information:
Applied Physics Letters, 106(12):Article No. 121904, Journal Name: Applied Physics Letters, 106(12):Article No. 121904
Country of Publication:
United States
Language:
English

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Influence of Chemistry and Misfit Dislocation Structure on Dopant Segregation at Complex Oxide Heterointerfaces journal September 2018
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