Identification of Mn Site in BaTiO<sub>3</sub>by Synchrotron X-Ray Absorption Spectroscopy Measurements

Yimnirun, Rattikorn; Tangsritrakul, Jirapa; Rujirawat, Saroj; Limpijumnong, Sukit

doi:10.1080/00150190902869814

Cited by 17 publications

(3 citation statements)

References 42 publications

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“…2C), which is characteristic of conventional dielectric materials with little electrical leakage ( 34 ). We also note that linear P - E curves were previously reported in substituted BaTiO 3 ceramics with 6H-hexagonal symmetry ( 45 , 55 ). In the temperature-dependent dielectric data of the as-sintered ceramics (Fig.…”

Section: Resultssupporting

confidence: 75%

Ultrahigh dielectric permittivity in oxide ceramics by hydrogenation

et al. 2023

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Boosting dielectric permittivity representing electrical polarizability of dielectric materials has been considered a keystone for achieving scientific breakthroughs as well as technological advances in various multifunctional devices. Here, we demonstrate sizable enhancements of low-frequency dielectric responses in oxygen-deficient oxide ceramics through specific treatments under humid environments. Ultrahigh dielectric permittivity (~5.2 × 10 6 at 1 Hz) is achieved by hydrogenation, when Ni-substituted BaTiO 3 ceramics are exposed to high humidity. Intriguingly, thermal annealing can restore the dielectric on-state (exhibiting huge polarizability in the treated ceramics) to the initial dielectric off-state (displaying low polarizability of ~10 3 in the pristine ceramics after sintering). The conversion between these two dielectric states via the ambient environment–mediated treatments and the successive application of external stimuli allows us to realize reversible control of dielectric relaxation characteristics in oxide ceramics. Conceptually, our findings are of practical interest for applications to highly efficient dielectric-based humidity sensors.

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Section: Resultssupporting

confidence: 75%

Ultrahigh dielectric permittivity in oxide ceramics by hydrogenation

et al. 2023

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“…X-ray absorption spectroscopy (XAS) is an important tool in science and technology and can be characterized by element specificity and penetration power. These features have realized a large number of applications for the element specific analysis of various materials, such as dopants or modifiers in dielectric materials, 1,2 semi-conductors, 3,4 glasses, [5][6][7][8] and catalysts. 9 An X-ray absorption spectrum is usually divided into two regions: the X-ray absorption near edge structure (XANES) which contains electronic and geometric information such as an oxidation number and centrosymmetry of the X-ray absorbing atom and the extended X-ray absorption fine structure (EXAFS) which contains important information about the local structure, such as the atomic distance between an X-ray absorbing atom and adjacent atoms and the coordination number of the neighboring atoms of the X-ray absorbing atom.…”

Section: Introductionmentioning

confidence: 99%

A theoretical approach to La L1-edge XANES spectra of La complex oxides and their local configuration

Asakura

Shishido

Teramura

et al. 2015

The Journal of Chemical Physics

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The characteristic peaks (pre-edge peaks) in the La L1-edge X-ray absorption near edge structure (XANES) of various La complex oxides were analyzed by both experimental and theoretical approaches. The pre-edge peak areas are correlated with the bond angle analysis (BAA) parameter, which we proposed as an indicator of the centrosymmetry or disorder of the local configuration of the La site. The origin of the pre-edge peak and the parameterization criteria of the BAA parameter were evaluated using theoretical calculations based on molecular orbital theory and multiple scattering theory. The theoretical calculations showed that the origin of the pre-edge peak at the La L1-edge is electric dipole transition from 2s to unoccupied states generated by p-d hybridization. Medium-scale theoretical simulations of the La L1-edge XANES spectra of thousands of virtual La aqueous complex models verified that the parameterization criteria of the BAA parameter are applicable to local configuration analysis of La.

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“…Most reports about low doping Mn into tetragonal structure BaTiO 3 indicate that low doping of 3d electrons to BaTiO 3 (BTO), decreases the ferroelectricity intensively, as an evident example of the repulsion of ferroelectricity and the 3d electron. [5][6][7][8] Thus, simply doping magnetic ions into ferroelectric materials, as an efficient way of exploring new materials, is blocked, and this limits exploration of multiferroic into nite systems.…”

Section: Introductionmentioning

confidence: 99%