Current channeling along extended defects during electroreduction of SrTiO3

Scientific Reports
C RodenbücherK Szot

Abstract

Electroreduction experiments on metal oxides are well established for investigating the nature of the material change in memresistive devices, whose basic working principle is an electrically-induced reduction. While numerous research studies on this topic have been conducted, the influence of extended defects such as dislocations has not been addressed in detail hitherto. Here, we show by employing thermal microscopy to detect local Joule heating effects in the first stage of electroreduction of SrTiO3 that the current is channelled along extended defects such as dislocations which were introduced mechanically by scratching or sawing. After prolonged degradation, the matrix of the crystal is also electroreduced and the influence of the initially present dislocations diminished. At this stage, a hotspot at the anode develops due to stoichiometry polarisation leading not only to the gliding of existing dislocations, but also to the evolution of new dislocations. Such a formation is caused by electrical and thermal stress showing dislocations may play a significant role in resistive switching effects.

References

Sep 6, 2002·Nature·Natasha ErdmanLaurence D Marks
Feb 3, 2006·Nature·Juan Carlos Ruiz-MoralesJohn T S Irvine
Oct 18, 2011·Physical Chemistry Chemical Physics : PCCP·Christian LenserRegina Dittmann
Mar 10, 2015·Journal of the American Chemical Society·Dario MarrocchelliBilge Yildiz
Oct 20, 2015·Nature Communications·Christoph BaeumerRegina Dittmann
Apr 29, 2016·ACS Applied Materials & Interfaces·Stephan P Waldow, Roger A De Souza
Aug 31, 2017·Reports on Progress in Physics·Yun-Yi PaiJeremy Levy
Feb 10, 2018·Reports on Progress in Physics·Yun-Yi PaiJeremy Levy

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Methods Mentioned

BETA
atomic force microscopy
optical microscopy
phase contrast microscopy

Software Mentioned

COMSOL Multiphysics ( COMSOL

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