Ren, Peng ; Gehringer, Maximilian ; Huang, Binxiang ; Hoang, An-Phuc ; Steiner, Sebastian ; Klein, Andreas ; Frömling, Till (2021)
High field electroformation of sodium bismuthtitanate and its solid solutions with bariumtitanate.
In: Journal of Materials Chemistry C, 9 (9)
doi: 10.1039/d0tc05728b
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Lead-free ceramics based on Na1/2Bi1/2TiO3(NBT) have been shown to exhibit excellent ferroelectric propertiesputting them amongst the best materials to replace lead-based piezoelectrics. The defect chemistry of NBT is,however, very complex. High oxygen ionic conductivity can be induced by acceptor doping or bismuthevaporation, which is quite detrimental to the ferroelectric properties. Nevertheless, this conductivity is non-linearly dependent on the acceptor concentration, which allows for tuning of NBT-based material from highlyionically conducting to highly resistive. This unique behavior raises the question of whether NBT ceramics alsoneed to be treated differently with respect to high electric fields as they are used for ferroelectric and dielectricapplications. High field electrodegradation experimentshavebeenperformedonNBTandasolidsolutionwithBaTiO3(BT) to elucidate this. It could be shown that reversible electroformation can be induced, which is non-linearly dependent on acceptor concentration. Additionally, a fast surface degradation process could beidentified, which could be attributed to a reversible field-induced change in composition at the anode dueto sodium becoming mobile. These results will be of high importance for reliability investigations of NBTbased material and also hint towards possible applications in resistive switching memory applications.

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