Local atomic and electronic structures and ferroelectric properties of PbZr0.52Ti0.48O3: An x-ray absorption study

Ray, S. C.; Hsueh, H. C.; Wu, Chih-Wei; Pao, C. W.; Liu, M. T.; Tsai, H. M.; Chuang, Chia-Hsun; Pong, W. F.; Chiou, J. W.; Tsai, Ming-Shian; Lee, J. M.; Jang, Ling‐Yun; Chen, J. M.; Lee, J. F.

doi:10.1063/1.3607475

Cited by 9 publications

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References 21 publications

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“…For the pyrochlore phases, feature B is broader than that of SrZrO 3 with a shoulder toward higher absorption energy, similar to that observed in the Ti L-edge of 6-coordinated Ti systems, including Gd 2 Ti 2 O 7 . ,, In 6-coordinate systems, the e g states are more sensitive to distortions of the local structure due to the overlap of d z 2 and d x 2 ‑y 2 states with ligand states, and such distortions result in broadening of the corresponding XANES spectral features . Peak-broadening caused by local distortion has been previously observed in Pb(Zr 1‑ x Ti x )O 3 . The lineshapes of the defect fluorite phases are more similar to those of ZrO 2 (7-coordinate) than to those of ZrSiO 4 .…”

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confidence: 63%

Does Local Disorder Occur in the Pyrochlore Zirconates?

et al. 2012

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The zirconates Ln(2)Zr(2)O(7) (Ln = lanthanoid) have been studied using a combination of Zr L-edge X-ray absorption near edge structure (XANES) and synchrotron X-ray and neutron powder diffraction methods. These studies demonstrate that as the size of the lanthanoid cation decreases, the local structure evolves smoothly from the ideal pyrochlore toward the defect fluorite rather than undergoing an abrupt transformation. The Zr L-edge spectrum is found to be extremely sensitive to changes in the local coordination environment and demonstrates an increase in local disorder across the pyrochlore oxides. The sensitivity of the XANES measurements enables us to identify the progressive nature of the transition that could not be detected using bulk diffraction techniques.

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Section: Resultssupporting

confidence: 63%

Does Local Disorder Occur in the Pyrochlore Zirconates?

et al. 2012

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Thin‐Film Ferroelectrics

et al. 2022

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non-centrosymmetric structures which can possess a spontaneous electric polarization which can be controlled using applied electric fields (Figure 1). Ferroelectrics themselves are inherently hierarchical materials-wherein picometer ionic displacements give rise to polarization which can collectively extend over millimeters or self-organize into complex mesoscopic structures or collectively reorient under applied stimuli (e.g., electric fields, temperature, or stress). Understanding these complex behaviors necessitates a multilevel approach, wherein atomistic, microscopic, mesoscopic, and macroscopic properties are studied in concert. Parallel advances in synthesis, characterization, and simulation have enabled such multimodal studies and provided a methodology through which a multitude of ferroelectric functionalities can now be achieved and studied.The promise of utilizing these functionalities in a number of applications kick-started the modern era of ferroelectric research in the mid-20th century. [1] Looking further back, in the 1920s, the ability to switch the polarization of sodium potassium tartrate tetrahydrate (commonly known as Rochelle salt) was first observed, along with dielectric and piezoelectric anomalies near the ferroelectric transition-now called the Curie point. In the 1940s, as part of the accelerated research push associated with World War II, ferroelectric BaTiO 3 was discovered by accident. When modifying TiO 2 with BaO to enhance its dielectric properties, a record-high dielectric permittivity was discovered and subsequent studies demonstrated a hysteretic switchable polarization. This discovery ushered in a new understanding of ferroelectricity as more than a rare phenomenon associated with salts that contained hydrogen bonding, but rather as a phenomenon that could exist in simple oxides like perovskites. Over the subsequent decades, the number of ferroelectric compositions exploded, particularly within the perovskite oxides, introducing new chemistries including LiNbO 3 and the PbZr x Ti 1−x O 3 system. Meanwhile, theoretical descriptions of ferroelectricity were advanced through lattice-dynamical models invoking a soft-mode optical phonon. Studies of the piezoelectric, thermodynamic, and optical properties in ferroelectric ceramics allowed for their deployment in a number of applications including piezoelectric sensors and pyroelectric infrared detectors. By the 1960s, increased interest in using ferroelectric polarization for nonvolatile memory was driving research into Over the last 30 years, the study of ferroelectric oxides has been revolutionized by the implementation of epitaxial-thin-film-based studies, which have driven many advances in the understanding of ferroelectric physics and the realization of novel polar structures and functionalities. New questions have motivated the development of advanced synthesis, characterization, and simulations of epitaxial thin films and, in turn, have provided new insights and applications across the micro-, meso-, and macroscopic length sc...

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