title: Scanning X-ray nanodiffraction from ferroelectric domains in strained K0.75Na0.25NbO3epitaxial films grown on (110) TbScO3.
abstract: Scanning X-ray nanodiffraction on a highly periodic ferroelectric domain pattern of a strained K0.75Na0.25NbO3epitaxial layer has been performed by using a focused X-ray beam of about 100 nm probe size. A 90°-rotated domain variant which is aligned along [1[Formula: see text]2]TSOhas been found in addition to the predominant domain variant where the domains are aligned along the [[Formula: see text]12]TSOdirection of the underlying (110) TbScO3(TSO) orthorhombic substrate. Owing to the larger elastic strain energy density, the 90°-rotated domains appear with significantly reduced probability. Furthermore, the 90°-rotated variant shows a larger vertical lattice spacing than the 0°-rotated domain variant. Calculations based on linear elasticity theory substantiate that this difference is caused by the elastic anisotropy of the K0.75Na0.25NbO3epitaxial layer.
authors.affiliation: Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, Berlin 12489, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Schmidbauer
authors.affiliation: Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin, Hausvogteiplatz 5-7, Berlin 10117, Germany.
authors.forename: Michael
authors.identifier: https://orcid.org/0000-0001-6398-6370
authors.initials: M
authors.lastname: Hanke
authors.affiliation: Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, Berlin 12489, Germany.
authors.forename: Albert
authors.initials: A
authors.lastname: Kwasniewski
authors.affiliation: Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, Berlin 12489, Germany.
authors.forename: Dorothee
authors.initials: D
authors.lastname: Braun
authors.affiliation: Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, Berlin 12489, Germany.
authors.forename: Leonard
authors.initials: L
authors.lastname: von Helden
authors.affiliation: Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, Berlin 12489, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Feldt
authors.affiliation: ESRF - The European Synchrotron, 71 Avenue des Martyrs, Grenoble Cedex 9, CS-40220, 38043, France.
authors.forename: Steven John
authors.initials: SJ
authors.lastname: Leake
authors.affiliation: Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, Berlin 12489, Germany.
authors.forename: Jutta
authors.identifier: https://orcid.org/0000-0002-8919-3608
authors.initials: J
authors.lastname: Schwarzkopf
keywords: KxNa1−xNbO3; X-ray nanodiffraction; ferroelectric domains; strained epitaxial films