Journal Article

FZJ-2020-04465

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Grain growth in weak electric fields in strontium titanate: Grain growth acceleration by defect redistribution

Rheinheimer, W. (Corresponding author)FZJ* ; Fülling, M. ; Hoffmann, M. J.

2016
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/26500  doi:10.1016/j.jeurceramsoc.2016.04.033

Abstract: The impact of DC electric fields on grain growth in strontium titanate is investigated between 1350 °C and 1550 °C for fields of up to 50 V/mm. To prevent joule heating by electrical currents, insulating Al2O3 plates separate electrodes from samples. The seeded polycrystal technique is used, which allows evaluating gradients induced by electric fields. The growth direction of the single crystalline seeds is perpendicular to the electric field; hence electrostatic forces do not influence its growth. Below 1425 °C, the influence of electric fields is very weak. Above 1425 °C the field results in an increase of the grain boundary mobility at the negative electrode.The enhancement of the boundary mobility at the negative electrode is attributed to electric field induced defect redistribution. Oxygen vacancies migrate towards the negative electrode, while strontium vacancies accumulate at the positive electrode. This defect redistribution is connected to the defect chemistry dependent grain growth in strontium titanate.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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