Journal Article

FZJ-2023-03460

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Reactive FAST/SPS sintering of strontium titanate as a tool for grain boundary engineering

Zahler, M. P.FZJ* ; Jennings, D.FZJ* ; Kindelmann, M.FZJ* ; Guillon, O.FZJ* ; Rheinheimer, W. (Corresponding author)FZJ*

2023
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2023.07.021  doi:10.34734/FZJ-2023-03460

Abstract: A high-pressure FAST/Spark Plasma Sintering method was used to produce dense SrTiO3 ceramics at temperaturesof 1050 ◦C, more than 250 ◦C below typical sintering temperatures. Combining SPS with solid-state reactivesintering further improves densification. The process resulted in fine-grained microstructures with grain sizes of~300 nm. STEM-EDS was utilized for analyzing cationic segregation at grain boundaries, revealing no cationicsegregation at the GBs after SPS. Electrochemical impedance spectroscopy indicates the presence of a spacecharge layer. Space charge thicknesses were calculated according to the plate capacitor equation and the Mott-Schottky model. They fit the expected size range, yet the corresponding space charge potentials are lower thantypical values of conventionally processed SrTiO3. The low space charge potential was associated to low cationicGB segregation after SPS and likely results in better grain boundary conductivity. The findings offer a path totailor grain boundary segregation and conductivity in perovskite ceramics.

Note: Open Access; Grants: DFG MA 1280/69-1 & Emmy Noether-Program No. Rh 146/1-1

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)

Appears in the scientific report 2023

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Database coverage:
; ; ; 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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