Publications SAMSON - Inorg. Chem. Commun., fév. 2022

Le 25 janvier 2022

Deux nouvelles publications de l'équipe SAMSON dans Inorganic Chemistry Communications:

Synthesized and characterizations nanoparticles of chalcopyrite alloy CuIn_1-xFe_xSe₂.


K. Benameur, Y. Mouchaal, K. Benchouk, A. Laafer and R. Barille

Abstract

Nanoparticle powders of CuIn_1-xFe_xSe₂ (x = 0, 0.05, 0.19, 0.30 and 0.50) alloys have been synthesized using the solvothermal method. The structural and optical properties of the nanoparticles properties are strongly influenced by the atomic percentage of iron present in the CuIn_1-xFe_xSe₂ quaternary compound. CuIn_1-xFe_xSe₂ nanopowders are crystallized in the tetragonal chalcopyrite phase as shown by X-ray diffraction. Scanning Electron Microscopy and Transmission Electron Microscopy analyses showed that CuIn_1-xFe_xSe₂ compounds are triangular-shaped nanoparticles varying in size that averages from 24 to 29 nm. Optical study showed an increase behavior in band gap of the nanopowders from 1.1 eV to 1.5 eV by varying × from 0 to 0.50.

DOI: 10.1016/j.inoche.2021.109165

Investigation of the effect of Sr-substitution on the structural, morphological, dielectric, and energy storage properties of BaTiO₃-based perovskite ceramics.


R. Moussi, A. Bougoffa, A. Trabelsi, E. Dhahri, M.P.F. Graça, M.A.Valente, R.Barille and M. Rguiti

Abstract

In this work, Ba_1-xSr_xTiO₃ (x = 0 and x = 0.3) samples, abbreviated respectively BT and BST, have been prepared by conventional solid state reaction. The pure phase formation and crystal structure were approved by X-ray powder diffraction analysis. The morphology of these samples were inspected by the transmission electron microscopy. The structural and morphological findings were confirmed by Raman measurements. The effect of the substitution of barium by strontium on the dielectric properties and on the energy storage of these compounds which has been discussed. In this issue, the results indicate the improvement of the dielectric properties of BT-based ceramics by substitution of Ba by Sr due to the decrease in dielectric losses and especially to the appearance of a relaxor behavior for the BST compound in the vicinity of room temperature. However, the P–E loops have proven a degradation of energy storage properties by Sr-substitution in BT ceramics.

DOI: 10.1016/j.inoche.2022.109225