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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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Carstensen, Leif
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Publications (3/3 displayed)
- 2023Mass transport and charge transfer through an electrified interface between metallic lithium and solid-state electrolytescitations
- 2022Revealing the solid-state processing mechanisms of antiferroelectric AgNbO3 for energy storagecitations
- 2021Characterization and Quantification of Depletion and Accumulation Layers in Solid‐State Li+‐Conducting Electrolytes Using In Situ Spectroscopic Ellipsometrycitations
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article
Revealing the solid-state processing mechanisms of antiferroelectric AgNbO3 for energy storage
Abstract
<p>AgNbO<sub>3</sub> is one of the prominent lead-free antiferroelectric (AFE) oxides, which readily exhibits a field-induced AFE to ferroelectric phase transition and thus a high energy storage density. The solid-state synthesis of AgNbO<sub>3</sub> is considered difficult and an oxidizing atmosphere is typically employed during AgNbO<sub>3</sub> processing, on the premise that oxygen can prevent possible decomposition of the silver oxide at high temperatures. However, details about the influence of processing parameters on the functional properties of AFE AgNbO<sub>3</sub> are insufficiently understood. In this work, the solid-state reaction of a stoichiometric AgO and Nb<sub>2</sub>O<sub>5</sub> mixture was investigated. We found that ball milling can convert AgO into metallic Ag, which is beneficial for lowering the reaction temperature for the formation of the perovskite phase to 500‒600℃. Moreover, the influence of the processing atmosphere (air, O<sub>2</sub>, and N<sub>2</sub>) was investigated by thermal analysis and in situ X-ray diffraction. Since the reaction between Ag and Nb<sub>2</sub>O<sub>5</sub> to form AgNbO<sub>3</sub> requires oxygen uptake, AgNbO<sub>3</sub> was only found to form in air and O<sub>2</sub>, whereby the kinetics were faster in the latter case. All the sintered AgNbO<sub>3</sub> samples exhibited a similar crystallographic structure, although the samples processed in O<sub>2</sub> had a lower oxygen vacancy concentration. Despite this, well-defined AFE double polarization loops were obtained in all cases. Our results indicate that decomposition of sliver oxide during ball milling is beneficial for the solid-state reaction, while a pure O<sub>2</sub> atmosphere is not essential for the synthesis of high-quality AgNbO<sub>3</sub>. These findings may simplify the processing and facilitate further research of AgNbO<sub>3</sub>-based antiferroelectrics.</p>