The amorphization of 3C-SiC irradiated at moderately elevated temperatures as revealed by X-ray diffraction - Université de Limoges Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2017

The amorphization of 3C-SiC irradiated at moderately elevated temperatures as revealed by X-ray diffraction

Résumé

Mechanisms of radiation damage buildup in 3C-SiC remain poorly understood. Here, we use X-ray diffraction in combination with numerical simulations to study depth profiles of radiation-produced strain and lattice damage in 3C-SiC bombarded in the temperature range of 25-200 °C with 500 keV Ar ions. Results reveal increased defect recombination with increasing temperature, with a critical amorphization fluence increasing from 0.17 to 0.44 displacements per atom. The amorphization process is found to be correlated with the evolution of lattice strain. We find that, at fluences corresponding to the onset of amorphization, lattice strain is ~2% and is independent of temperature. With continuing bombardment above the onset of amorphization, the strain in the crystal bulk increases and reaches a saturation value that decreases from 7% to 5% with increasing temperature. Based on strain profiles, we compute depth profiles of the effective concentration of point defect clusters in the crystalline phase. Bombardment at higher temperatures results in lower maximum defect concentrations pointing to enhanced defect mobility. 1

Domaines

Matériaux
Fichier principal
Vignette du fichier
Text_revised_final.pdf (994.52 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02193096 , version 1 (24-07-2019)

Identifiants

Citer

Alexandre Boulle, A. Debelle, J.B. Wallace, L.B. Bayu Aji, L B Bayu Aji, et al.. The amorphization of 3C-SiC irradiated at moderately elevated temperatures as revealed by X-ray diffraction. Acta Materialia, 2017, 140, pp.250-257. ⟨10.1016/j.actamat.2017.08.030⟩. ⟨hal-02193096⟩
58 Consultations
114 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More