| Autor: |
Acharya, Megha, Banyas, Ella, Ramesh, Maya, Jiang, Yizhe, Fernandez, Abel, Dasgupta, Arvind, Ling, Handong, Hanrahan, Brendan, Persson, Kristin, Neaton, Jeffrey B, Martin, Lane W |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Advanced materials (Deerfield Beach, Fla.), vol 34, iss 1 |
| Popis: |
The hafnate perovskites PbHfO3 (antiferroelectric) and SrHfO3 ("potential" ferroelectric) are studied as epitaxial thin films on SrTiO3 (001) substrates with the added opportunity of observing a morphotropic phase boundary (MPB) in the Pb1- x Srx HfO3 system. The resulting (240)-oriented PbHfO3 (Pba2) films exhibited antiferroelectric switching with a saturation polarization ≈53 µC cm-2 at 1.6 MV cm-1 , weak-field dielectric constant ≈186 at 298 K, and an antiferroelectric-to-paraelectric phase transition at ≈518 K. (002)-oriented SrHfO3 films exhibited neither ferroelectric behavior nor evidence of a polar P4mm phase . Instead, the SrHfO3 films exhibited a weak-field dielectric constant ≈25 at 298 K and no signs of a structural transition to a polar phase as a function of temperature (77-623 K) and electric field (-3 to 3 MV cm-1 ). While the lack of ferroelectric order in SrHfO3 removes the potential for MPB, structural and property evolution of the Pb1- x Srx HfO3 (0 ≤ x |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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