Regensburg 2025 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 1: (Multi)ferroic States: From Fundamentals to Applications (I)
KFM 1.6: Vortrag
Montag, 17. März 2025, 11:00–11:15, H9
Stabilization and Characterization of the LiNbO3-type Phase in NiTiO3 Thin Films: Towards Ferroelectricity — •Meriem Chettab1, Quentin Simon1, Mustapha Zaghrioui1, Oleg I. Lebedev2, Xavier Rocquefelte3, Gwenhael Duplaix-Rata3, Richard Retoux2, and Patrick Laffez1 — 1University of Tours, GREMAN, UMR 7347-CNRS, IUT de Blois 15 Rue de la Chocolaterie, 41029 Blois Cedex, France — 2University of Caen, CRISMAT, UMR 6508 - CNRS, ENSICAEN 6 Bd Maréchal Juin, 14000 Caen, France — 3Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226 - F-35000 Rennes, France
Nickel titanate (NiTiO3) exhibits polymorphic structures, including ilmenite (IL), LiNbO3-type (LN), and corundum (CR), with the LN phase being potentially ferroelectric. NiTiO3 thin films were deposited by RF sputtering in an Ar/O2 plasma on Si(100) substrates at temperatures between 400 °C and 650 °C. XRD, Raman spectroscopy, and HRTEM revealed a mixture of IL, LN, and CR phases at lower temperatures, with pure IL films obtained at 650 °C. All films showed a [00W] fiber texture. Post-annealing at 800 °C transformed the films into pure IL while preserving the texture. DFT simulations predicted Raman spectra for LN and CR phases, offering insight into phase behavior. This study highlights the potential of the LN phase for ferroelectric applications.
Keywords: NiTiO3 thin films; Nickel titanate; Multiferroics; LiNbO3-type phase; Sputtering deposition