Multifunctionality of Li2SrNb2O7: Memristivity, Tunable Rectification, Ferroelasticity, and Ferroelectricity

Xianghan Xu; Fei-Ting Huang; Kai DuSang-Wook Cheong

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Multifunctionality of Li2SrNb2O7: Memristivity, Tunable Rectification, Ferroelasticity, and Ferroelectricity

机译：Multifunctionality of Li2SrNb2O7: Memristivity, Tunable Rectification, Ferroelasticity, and Ferroelectricity

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Layered Li_2SrNb_2O_7, an inorganic oxide in its bulk single-crystalline form, is experimentally demonstrated to exhibit multiple structural facets such as ferroelasticity, ferroelectricity, and antiferroelectricity. The transition from a room temperature (RT) centrosymmetric structure to a low-temperature out-of-plane ferroelectric and in-plane antiferroelectric structure and the lowtemperature (LT) ferroelectric domain configuration are unveiled in TEM, piezoresponse force microscopy, and polarization loop studies. Li_2SrNb_2O_7 also exhibits highly tunable ferroelasticity and excellent Li~+ in-plane conduction, which leads to a giant in-plane memristor behavior and an in-plane electronic conductivity increase by three orders of magnitude by electric poling at room RT). The accumulation of Li~+ vacancies at the crystal–electrode interface is visualized using in situ optical microscopy. The Li-ionic biased state shows a clear in-plane rectification effect combined with a significant relaxation upon time at RT. Relaxation can be fully suppressed at LTs such as 200 K, and utilizing an electric field cooling, a stable rectification can be achieved at 200 K. The results shed light on the selective control of multifunctionalities such as ferroelasticity, ferroelectricity, and ionic-migration-mediated effects (a memristor effect and rectification) in a single-phase bulk material utilizing, for example, different directions, temperatures, frequencies, and magnitudes of electric field.

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来源
《Advanced Materials》 |2022年第44期|2206022.1-2206022.10|共10页
作者
Xianghan Xu; Fei-Ting Huang; Kai DuSang-Wook Cheong;
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Rutgers Center for Emergent Materials and Department of Physics and Astronomy Rutgers University Piscataway, NJ 08854, USA;

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正文语种英语
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antiferroelectricity; ferroelectricity; ionic conductors; memristors; rectification; Ruddlesden–Popper phase; single crystals;

Multifunctionality of Li2SrNb2O7: Memristivity, Tunable Rectification, Ferroelasticity, and Ferroelectricity

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