Direct epitaxial growth of polar Hf0.5 Zr0.5 O2 films on corundum

Barriuso, E. ; Koutsogiannis, P. ; Serrate, D. ; Herrero-Martín, J. ; Jiménez, R. ; Magén, C. (Universidad de Zaragoza) ; Algueró, M. ; Algarabel, P. A. ; Pardo, J. A. (Universidad de Zaragoza)

Resumen: Single-phase epitaxial Hf0.5 Zr0.5 O2 films with non-centrosymmetric orthorhombic structure have been grown directly on electrode-free corundum (a-Al2 O3) substrates by pulsed laser deposition. A combination of high-resolution X-ray diffraction and X-ray absorption spectroscopy confirms the epitaxial growth of high-quality films belonging to the Pca21 space group, with 111] out-of-plane orientation. The surface of a 7-nm-thick sample exhibits an atomic step-terrace structure with a corrugation of the order of one atomic layer, as proved by atomic force microscopy. Scanning transmission electron microscopy reveals that it consists of grains with around 10 nm lateral size. The polar nature of this film has been corroborated by pyroelectric measurements. These results shed light on the mechanisms of the epitaxial stabilization of the ferroelectric phase of hafnia. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Idioma: Inglés

DOI: 10.3390/nano12071232

Año: 2022

Publicado en: Nanomaterials 12, 7 (2022), 1232 [11 pp]
ISSN: 2079-4991

Factor impacto JCR: 5.3 (2022)

Categ. JCR: PHYSICS, APPLIED rank: 39 / 160 = 0.244 (2022) - Q1 - T1
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Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 58 / 178 = 0.326 (2022) - Q2 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 110 / 343 = 0.321 (2022) - Q2 - T1

Factor impacto CITESCORE: 7.4 - Chemical Engineering (Q1) - Materials Science (Q1)

Factor impacto SCIMAGO: 0.811 - Chemical Engineering (miscellaneous) (Q1) - Materials Science (miscellaneous) (Q2)

Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2019-107338RB-C64
Financiación: info:eu-repo/grantAgreement/ES/DGA/E28-20R
Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/E12-20R
Financiación: info:eu-repo/grantAgreement/EC/H2020/ 861153/EU/Materials for Neuromorphic Circuits/MANIC
Financiación: info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3
Financiación: info:eu-repo/grantAgreement/ES/MCIU/PID2020-112914RB-I00
Financiación: info:eu-repo/grantAgreement/ES/MCIN/AEI/10.13039/501100011033
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2017-88788-R

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)