期刊
CHEMISTRY OF MATERIALS
卷 29, 期 15, 页码 6544-6551出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b02506
关键词
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资金
- National Science Foundation [OISE-1545907, DMR-1708615, DMR-1608938, DMR-1451219]
- Molecular Foundry - Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy
- Laboratory Directed Research and Development Program at the Lawrence Berkeley National Laboratory [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-SC0012375]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF5307]
- Army Research Office [W911NF-14-1-0104]
- U.S. Department of Energy (DOE) Office of Science [DE-AC02-06CH11357]
- Direct For Mathematical & Physical Scien [1608938, 1451219] Funding Source: National Science Foundation
- Division Of Materials Research [1451219, 1608938] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1434147] Funding Source: National Science Foundation
Antiferroelectric PbZrO3 is being considered for a wide range of applications where the competition between centrosymmetric and noncentrosymmetric phases is important to the response. Here, we focus on the epitaxial growth of PbZrO3 thin films and understanding the chemistry structure coupling in Pb1+delta ZrO3 (delta = 0, 0.1, 0.2). High-quality, single-phase Pb1+delta ZrO3 films are synthesized via pulsed-laser deposition. Although no significant lattice parameter change is observed in X-ray studies, electrical characterization reveals that while the PbZrO3 and Pb1.1ZrO3 heterostructures remain intrinsically antiferroelectric, the Pb1.2ZrO3 heterostructures exhibit a hysteresis loop indicative of ferroelectric response. Further X-ray scattering studies reveal strong quarter-order diffraction peaks in PbZrO3 and Pb1.1ZrO3 heterostructures indicative of antiferroelectricity, while no such peaks are observed for Pb1.2ZrO3 heterostructures. Density functional theory calculations suggest the large cation nonstoichiometry is accommodated by incorporation of antisite Pb-Zr defects, which drive the Pb1.2ZrO3 heterostructures to a ferroelectric phase with R3c symmetry. In the end, stabilization of metastable phases in materials via chemical nonstoichiometry and defect engineering enables a novel route to manipulate the energy of the ground state of materials and the corresponding material properties.
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