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Open AccessArticle

Inhomogeneity and Segregation Effect in the Surface Layer of Fe-Doped SrTiO3 Single Crystals

1
Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41–500 Chorzow, Poland
2
Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(1), 33; https://doi.org/10.3390/cryst10010033
Received: 19 November 2019 / Revised: 6 January 2020 / Accepted: 8 January 2020 / Published: 10 January 2020
(This article belongs to the Special Issue Electronic Phenomena of Transition Metal Oxides)
The effect of Fe doping on SrTiO3 single crystals was investigated in terms of crystal and electronic structure over a wide temperature range in both oxidizing and reducing conditions. The electrical properties were thoroughly studied with a special focus on the resistive switching phenomenon. Contrary to the undoped SrTiO3 crystals, where isolated filaments are responsible for resistive switching, the iron-doped crystals showed stripe-like conducting regions at the nanoscale. The results showed a non-uniform Fe distribution of as-received crystals and the formation of new phases in the surface layer of reduced/oxidized samples. The oxidation procedure led to a separation of Ti(Fe) and Sr, while the reduction resulted in the tendency of Fe to agglomerate and migrate away from the surface as seen from the time of flight mass spectroscopy measurements. Moreover, a clear presence of Fe-rich nano-filament in the reduced sample was found. View Full-Text
Keywords: electronic oxides; strontium titanate; extended defects electronic oxides; strontium titanate; extended defects
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Wojtyniak, M.; Balin, K.; Szade, J.; Szot, K. Inhomogeneity and Segregation Effect in the Surface Layer of Fe-Doped SrTiO3 Single Crystals. Crystals 2020, 10, 33.

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