Electronic and crystal structure changes induced by in-plane oxygen vacancies in multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>YMn</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Cheng, Shaobo; Li, Menglei; Meng, Qingping; Duan, Wenhui; Zhao, Yinchang; Sun, Xiaofeng; Zhu, Yimei; Zhu, Jing

doi:10.1103/physrevb.93.054409

Cited by 28 publications

(30 citation statements)

References 33 publications

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“…In the YMnO 3 film, the ferroelectric displacement can be observed at the [110] zone axis. The quantitative result for the ferroelectric polarization values can be found in the Supplementary Materials ( 11 ). The ferroelectric value decreases at the interface but increases to bulk value very soon.…”

Section: Resultsmentioning

confidence: 99%

Interface reconstruction with emerging charge ordering in hexagonal manganite

Cheng

Deng

et al. 2018

Sci. Adv.

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Section: Resultsmentioning

confidence: 99%

Interface reconstruction with emerging charge ordering in hexagonal manganite

Cheng

Deng

et al. 2018

Sci. Adv.

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“…Overall, the underbonded Mn and O3/O4 atoms are an important feature of the YMnO 3 structure. Recently, Cheng et al [21] reported that prolonged irradiation of YMnO 3 by an electron beam in TEM results in formation of oxygen vacancies preferentially on the O3/O4 sites. These results, which are supported by the density-functional calculations showing lower energies of formation for vacancies on the O3/O4 as opposed to O1/O2 sites [20], concur with our BVS assessments.…”

Section: Structure Of Ymno 3 : Average Vs Localmentioning

confidence: 99%

Oxygen-storage behavior and local structure in Ti-substituted YMnO3

Levin

Krayzman

Vanderah

et al. 2017

Journal of Solid State Chemistry

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Hexagonal manganates RMnO 3 (R=Y, Ho, Dy) have been recently shown to exhibit oxygenstorage capacities promising for three-way catalysts, air-separation, and related technologies.Here, we demonstrate that Ti substitution for Mn can be used to chemically tune the oxygenbreathing properties of these materials towards practical applications. Specifically, Y(Mn 1-x Ti x )O 3 solid solutions exhibit facile oxygen absorption/desorption via reversible Ti 3+ Ti 4+ and Mn 3+ Mn 4+ reactions already in ambient air at ≈400 °C and ≈250 °C, respectively. On cooling, the oxidation of both cations is accompanied by oxygen uptake yielding a formula YMn 3+ 1-xy Mn 4+ y Ti 4+x O 3+ . The presence of Ti promotes the oxidation of Mn 3+ to Mn 4+ , which is almost negligible for YMnO 3 in air, thereby increasing the uptake of oxygen beyond that required for a given Ti 4+ concentration. The reversibility of the redox reactions is limited by sluggish kinetics; however, the oxidation process continues, if slowly, even at room temperature. The extra oxygen atoms are accommodated by the large interstices within a triangular lattice formed by the [MnO 5 ] trigonal bipyramids. According to bond distances from Rietveld refinements using the neutron diffraction data, the YMnO 3 structure features under-bonded Mn and even more severely under-bonded oxygen atoms that form the trigonal bases of the [MnO 5 ] bipyramids. The tensile bond strain around the 5-fold coordinated Mn site and the strong preference of Ti 4+ (and Mn 4+ ) for higher coordination numbers likely provide driving forces for the oxidation reaction. Reverse Monte Carlo refinements of the local atomic displacements using neutron total scattering revealed how the excess oxygen atoms are accommodated in the structure by correlated local displacements of the host atoms. Large displacements of the under-bonded host oxygen atoms play a key part in this lattice-relaxation process, facilitating reversible exchange of significant amounts of oxygen with atmosphere.

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“…In fact, the current generated by the first pulse (point‐1) generates both polarization switching and capacitor charging currents ( I P+C ), whereas the only capacitor charging current ( I C ) appears for the second pulse (point‐2), since no polarization occurs during the second pulse. [ 34 ] Therefore, double pulse measurements provide another evidence of the polarization in the AgNWs/HfO 2 /SiO 2 /Si device. Further, the stabile flipping of ferroelectric polarization corresponding to three voltages, e.g., +3.0, +5.0, and +8.0 V with a number of iterations was confirmed and shown in Figure 2c, which shows the reproducible behavior of the polarization.…”

Section: Resultsmentioning

confidence: 99%

High‐Performing Self‐Powered Photosensing and Reconfigurable Pyro‐photoelectric Memory with Ferroelectric Hafnium Oxide

Kumar

Seo

2021

Advanced Materials

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With highly diverse multifunctional properties, hafnium oxide (HfO2) has attracted considerable attention not only because of its potential to address fundamental questions about material behaviors, but also its potential for applied perspectives like ferroelectric memory, transistors, and pyroelectric sensors. However, effective harvesting of the pyro‐photoelectric effect of HfO2 to develop high‐performing self‐biased photosensors and electric writable and optical readable memory has yet to be developed. Here, a proof‐of‐concept HfO2‐based self‐powered and ultrafast (response time ≈ 60 µs) infrared pyroelectric sensor with a responsivity of up to 68 µA W−1 is developed. In particular, temporal infrared light illumination induced surface heating and, in turn, change in spontaneous polarization are attributed to robust pyro‐photocurrent generation. Further, controllable suspension and reestablishment of the self‐biased pyro‐photocurrent response with a short electric pulse are demonstrated, which offers a conceptually new kind of photoreadable memory. Potentially, the novel approach opens a new avenue for designing on‐demand pyro‐phototronic response over a desired area and offers the opportunity to utilize it for various applications, including memory storage, neuromorphic vision sensors, classification, and emergency alert systems.

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Electronic and crystal structure changes induced by in-plane oxygen vacancies in multiferroicYMnO3

Cited by 28 publications

References 33 publications

Interface reconstruction with emerging charge ordering in hexagonal manganite

Interface reconstruction with emerging charge ordering in hexagonal manganite

Oxygen-storage behavior and local structure in Ti-substituted YMnO3

High‐Performing Self‐Powered Photosensing and Reconfigurable Pyro‐photoelectric Memory with Ferroelectric Hafnium Oxide

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