Nanocomposite stability in Fe-, Co-, and Mn-based perovskite/spinel systems

Abstract

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A DFT+U investigation of hydrogen adsorption on the LaFeO3(010) surface

“…The charge gained by the hydrogen caused the molecular and dihydrogen H−H bonds, which were initially at 0.740 Å and 0.796 Å, respectively, to break after adsorption, increasing the H-H distance to 1.634 Å. The Fe atom which interacts with the adsorbing H2 atom, loses a charge of 0.21 e − , whether H2 adsorbs as molecular, dihydrogen or dihydride species, suggestive of further oxidation of the Fe 3+ ions.Similar observations were made by Hoffmann and co-workers who reported a change of valence states of the B site in perovskite ABO3 structure 84.…”

Challenges in Sr2FeMoO6−δ Thin Film Deposition

“…However, thin films of perovskite-spinel composites are known to be manufactured onto SrTiO 3 substrates both by PLD [157,158] and by ceramic target magnetron sputtering. [159] The addition of a second phase in composites, which is most likely located at the GBs, improves the barrier for spin-dependent intergranular tunneling. Thereby, the crystal structure of SFMO should not be changed.…”

“…Table consists of solely ceramic technologies of composite fabrication. However, thin films of perovskite‐spinel composites are known to be manufactured onto SrTiO 3 substrates both by PLD and by ceramic target magnetron sputtering …”

Role of modulus mismatch in vertically aligned nanocomposite formation during spinodal decomposition in constrained films

“…[8][9][10][11] The vertically aligned composition modulated structure was observed in various phase decomposing oxide films. [12][13][14][15][16][17][18] Such film consists of one phase with arrays of rod-like (columnar) or laminar precipitation dispersed in the other phase and oriented perpendicular to the substrate surface, as shown in Figure 1. The lateral morphology with chessboard-like pattern, or laminar to labyrinth pattern, or random structure was reported.…”

“…The lateral morphology with chessboard-like pattern, or laminar to labyrinth pattern, or random structure was reported. [12][13][14][15][16][17][18] Recently, the general rules of vertically aligned nanocomposite structure formation were summarized. 19 However, it is still not clear how to achieve the desired twophase columnar structure, which is influenced by many interacting factors including the kinetic growth parameters, the elastic and interface energies of the phases, and the phase fraction of the phases.…”