High-pressure behavior of heteroepitaxial core-shell particles made of Prussian blue analogs - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Applied Physics Année : 2021

High-pressure behavior of heteroepitaxial core-shell particles made of Prussian blue analogs

Résumé

We report the compressibility of two Prussian blue analogs (PBAs) under hydrostatic pressure, one with small and one with a relatively large cubic unit cell among PBAs, and investigate the modification of their elastic properties when the two lattices are coupled within a heteroepitaxial core-shell structure. Bulk modulus (K0) values are derived from x-ray powder diffraction experiments using a diamond anvil cell with silicone oil as a pressure-transmitting medium. The pressure-volume curves fitted to Murnaghan equations of states show that K0 inversely scales with the crystal packing for the rubidium cobalt hexacyanoferrate and rubidium nickel hexacyanochromate samples (K0 ∼ 29 GPa for Co-Fe PBA, a0 = 9.95 Å and ∼20 GPa for Ni-Cr PBA, a0 = 10.48 Å with a0 being the lattice constant at ambient pressure). The two single-phase samples undergo a cubic-to-rhombohedral phase transition above ∼0.8 GPa, which correlates fairly well with the build-up of nonhydrostatic pressure contributions in the cell. Within the core-shell structure, the volume change observed for the core scales with that of the shell because of the configuration close to the case of a solid pressure-transmitting medium. The Ni-Cr PBA shell layer exhibits an increased rhombohedral distortion with respect to the single-phase reference possibly associated with shearing at the core-shell interface. Its bulk modulus is not significantly modified with respect to that of the single-phase sample despite the presence of defects associated with the growth mode, whereas the P-V curve of the core suggests a stiffening of the Co-Fe PBA lattice.
Fichier principal
Vignette du fichier
JAP21-AR-STMMS2021-01185(2).pdf (1.75 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Commentaire : This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This paper appeared in J. Appl. Phys. 129, 235106 (2021) and may be found at [ https://doi.org/10.1063/5.0049223.%22 | https://doi.org/10.1063/5.0049223.

Dates et versions

hal-03286022 , version 1 (05-11-2021)

Identifiants

Citer

Isabelle Maurin, Miho Itoi, John Cain, Daniel Talham, Thierry Gacoin, et al.. High-pressure behavior of heteroepitaxial core-shell particles made of Prussian blue analogs. Journal of Applied Physics, 2021, 129 (23), pp.235106. ⟨10.1063/5.0049223⟩. ⟨hal-03286022⟩
80 Consultations
58 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More