Home > Workflow collections > Publication Charges > Reactive FAST/SPS sintering of strontium titanate as a tool for grain boundary engineering > print

001     1014776
005     20240711085631.0
024 7 _ |a 10.1016/j.jeurceramsoc.2023.07.021
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024 7 _ |a 10.34734/FZJ-2023-03460
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100 1 _ |a Zahler, M. Pascal
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245 _ _ |a Reactive FAST/SPS sintering of strontium titanate as a tool for grain boundary engineering
260 _ _ |a Amsterdam [u.a.]
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500 _ _ |a Open Access; Grants: DFG MA 1280/69-1 & Emmy Noether-Program No. Rh 146/1-1
520 _ _ |a 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.
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700 1 _ |a Jennings, Dylan
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700 1 _ |a Kindelmann, Moritz
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700 1 _ |a Guillon, Olivier
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700 1 _ |a Rheinheimer, Wolfgang
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773 _ _ |a 10.1016/j.jeurceramsoc.2023.07.021
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