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• W3034900019 abstract "HfO2 and ZrO2 have increasingly drawn the interest of researchers as lead-free and silicon technology-compatible materials for ferroelectric, pyroelectric, and piezoelectric applications in thin films such as ferroelectric field-effect transistors, ferroelectric random access memories, nanoscale sensors, and energy harvesters. Owing to the environmental regulations against lead-containing electronic components, HfO2 and ZrO2 offer, along with AlN, (K,Na)NbO3- and (Bi0.5Na0.5)TiO3-based materials, an alternative to Pb(ZrxTi1–x)O3-based materials, which are the overwhelmingly used ceramics in industry. HfO2 and ZrO2 thin films may show field-induced phase transformation from the paraelectric tetragonal to the ferroelectric orthorhombic phase, leading to a change in crystal volume and thus strain. These field-induced strains have already been measured experimentally in pure and doped systems; however, no systematic optimization of the piezoelectric activity was performed, either experimentally or theoretically. In this screening study, we calculate the ultimate size of this effect for 58 dopants depending on the oxygen supply and the defect incorporation type: substitutional or interstitial. The largest piezoelectric strain values are achieved with Yb, Li, and Na in ZrO2 and exceed 40 pm V–1 or 0.8% maximal strain, which exceeds the best experimental findings by a factor of 2. Furthermore, we discovered that Mo, W, and Hg make the polar-orthorhombic phase in the ZrO2 bulk stable under certain circumstances, which would count in favor of these systems for the ceramic crystallization process. Our work guides the development of the performance of a promising material system by rational design of the essential mechanisms so as to apply it to unforeseen applications." @default.
• W3034900019 created "2020-06-19" @default.
• W3034900019 creator A5007271449 @default.
• W3034900019 creator A5025362825 @default.
• W3034900019 date "2020-06-15" @default.
• W3034900019 modified "2023-10-01" @default.
• W3034900019 title "Optimizing the Piezoelectric Strain in ZrO₂- and HfO₂-Based Incipient Ferroelectrics for Thin-Film Applications: An Ab Initio Dopant Screening Study" @default.
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• W3034900019 doi "https://doi.org/10.1021/acsami.0c08310" @default.
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