Atomically resolved domain boundary structure in lead zirconate-based antiferroelectrics

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2019-09-18
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Ma, Tao
Fan, Zhongming
Tan, Xiaoli
Tan, Xiaoli
Zhou, Lin
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Tan, Xiaoli
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Ames Laboratory
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Ames LaboratoryMaterials Science and Engineering
Abstract

Domain boundary (DB) structures are of great importance for understanding the structure-property relationship in many ferroic crystals. Here, we present atomically resolved DB configurations in PbZrO3-based antiferroelectric ceramics. The Pb-cation displacement relative to B-site cations is precisely determined using aberration-corrected scanning transmission electron microscopy. We find that 90° DBs in undoped PbZrO3 can be as thin as one primitive cell of the perovskite structure, often appearing curved or zigzagged due to the complex dipole arrangement. In a chemically modified composition, Pb0.99Nb0.02[(Zr0.57Sn0.43)0.95Ti0.05]0.98O3, in which incommensurate modulations are present, the DB has a typical thickness of at least two primitive cells, with more or less aligned dipole moments. Our findings provide insights into establishing the structure-property relationship in antiferroelectrics, shedding light on the design and fabrication of domain-boundary electronics.

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This article is published as Ma, Tao, Zhongming Fan, Xiaoli Tan, and Lin Zhou. "Atomically resolved domain boundary structure in lead zirconate-based antiferroelectrics." Applied Physics Letters 115, no. 12 (2019): 122902. DOI: 10.1063/1.5115039. Posted with permission.

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