Structure of (001)-, (110)-, and (111)-oriented Pb(Fe_1/2Nb_1/2)O₃ epitaxial thin films on SrRuO₃-buffered SrTiO₃ substrates

Abstract

We have studied the lattice structure of variously oriented lead iron niobate (PFN) thin films with thicknesses of 50 < t < 500 nm that were deposited by pulsed laser deposition (PLD). We have identified that (001)-, (110)-, and (111)-oriented PFN thin films have tetragonal, orthorhombic, and rhombohedral phases at room temperature, respectively. The change in phase stability, when deposited on substrates of different orientations, is discussed with respect to the influence of epitaxial stress.

Facet-Dependent in Situ Growth of Nanoparticles in Epitaxial Thin Films: The Role of Interfacial Energy

“…The as-deposited films have larger unit cell volumes than the bulk polycrystalline powder, as reported in other oxide film deposited by PLD, that is, (La,Sr)­CoO 3 or ceria-based films. , The structure of as-deposited (001)-oriented film is tetragonal, as-deposited (110)-oriented film is double-cell orthorhombic or equivalently limiting monoclinic, and as-deposited (111)-oriented film is rhombohedral (Figure S5). The XRD analysis reveals two notable points: (i) after reduction, lattice spacing of the films approach bulk values similar to macrocrystalline pellets (Figure a−c, Figure S6) while the films retain their crystallinity (Figure and S4). The result means that initially stretched as-deposited films come back to the bulk unit cell dimension upon reduction.…”

“…34,35 The structure of as-deposited (001)oriented film is tetragonal, as-deposited (110)-oriented film is double-cell orthorhombic or equivalently limiting monoclinic, and as-deposited (111)-oriented film is rhombohedral (Figure S5). 36 The XRD analysis reveals two notable points: (i) after reduction, lattice spacing of the films approach bulk values similar to macrocrystalline pellets (Figure 3a−c, Figure S6) while the films retain their crystallinity (Figure 3 To probe surface chemistry of LSTN films, X-ray photoelectron spectroscopy (XPS) patterns were obtained from (001)-and (111)-oriented films (Figure 4). A summary of numerical data for La, Sr, Ti, and Ni (effective peak area and respective atomic ratio) before and after reduction, respectively, is provided (Table S2).…”

Lead ferroniobat ceramic and films structures manufacture features and dielectric characteristic

“…PFN have great perspectives for UHF and sensor technique [3], especially in thin film form [2,4]. A series of papers is devoted to growth and characterization of lead ferroniobat thin films, but achieved structural properties are not high yet [5,6], even when one uses specially prepared substrate [7]. Almost all PFN thin films have been prepared by pulsed laser depositions [4 -6], film parameters are critical to substrate temperature and ambient oxygen pressure [5].…”

Enhancement of multiferroic properties of Pb(Fe1/2Nb1/2)O3 thin films on SrRuO3 buffered SrTiO3 substrates

“…Detailed measurements and calculations of the lattice constants of PFN thin films are given in Ref. 21. The negative values mean that the constraint stress is compressive.…”