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X-ray diffraction studies of neutron irradiated beryllium oxide; Etude par diffraction des rayons X de glucine irradiee aux neutrons

Abstract

X-ray diagrams of neutron irradiated sintered BeO (E > 1 MeV) can be classified into 3 types depending on the value of the c/a ratio, independently of the characteristics of the sinters, (hot pressed or cold pressed, material, variable density and grain size, pure BeO or BeO with additions). The anisotropic expansion of the BeO lattice caused by irradiation depends not only on the dose of irradiation, but also on the intergranular stresses of the samples. The sintered samples which resist most satisfactorily to irradiation consist of cold pressed high density and small grain size material for which the c/a ratio varies little with increasing dosage. The single crystal diagrams show the same classification as the polycrystalline material in respect with the c/a ratio. Furthermore, in addition to the Bragg reflections, X-ray diffusions are observed; the distribution of the defects is no longer isotropic; a description is given in particular of the scattering which occurs when 1.625 < c/a < 1.645. It appears that the defects start to congregate and cause pronounced distortion of the lattice. The defects are stabilized in the form of large aggregates only when a later irradiation stage is reached. (author) [French] Les diagrammes de rayons  More>>
Authors:
Belbeoch, B; Rodot, J; Roulliay, M [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1966
Product Type:
Technical Report
Report Number:
CEA-R-2943
Resource Relation:
Other Information: 28 refs; PBD: 1966
Subject:
36 MATERIALS SCIENCE; BERYLLIUM OXIDES; CRYSTAL DEFECTS; EXPANSION; PHYSICAL RADIATION EFFECTS; RADIATION SCATTERING ANALYSIS; SINTERED MATERIALS; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION
OSTI ID:
20603220
Research Organizations:
CEA Saclay, 91 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2943049741
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[58] pages
Announcement Date:
Jul 03, 2005

Citation Formats

Belbeoch, B, Rodot, J, and Roulliay, M. X-ray diffraction studies of neutron irradiated beryllium oxide; Etude par diffraction des rayons X de glucine irradiee aux neutrons. France: N. p., 1966. Web.
Belbeoch, B, Rodot, J, & Roulliay, M. X-ray diffraction studies of neutron irradiated beryllium oxide; Etude par diffraction des rayons X de glucine irradiee aux neutrons. France.
Belbeoch, B, Rodot, J, and Roulliay, M. 1966. "X-ray diffraction studies of neutron irradiated beryllium oxide; Etude par diffraction des rayons X de glucine irradiee aux neutrons." France.
@misc{etde_20603220,
title = {X-ray diffraction studies of neutron irradiated beryllium oxide; Etude par diffraction des rayons X de glucine irradiee aux neutrons}
author = {Belbeoch, B, Rodot, J, and Roulliay, M}
abstractNote = {X-ray diagrams of neutron irradiated sintered BeO (E > 1 MeV) can be classified into 3 types depending on the value of the c/a ratio, independently of the characteristics of the sinters, (hot pressed or cold pressed, material, variable density and grain size, pure BeO or BeO with additions). The anisotropic expansion of the BeO lattice caused by irradiation depends not only on the dose of irradiation, but also on the intergranular stresses of the samples. The sintered samples which resist most satisfactorily to irradiation consist of cold pressed high density and small grain size material for which the c/a ratio varies little with increasing dosage. The single crystal diagrams show the same classification as the polycrystalline material in respect with the c/a ratio. Furthermore, in addition to the Bragg reflections, X-ray diffusions are observed; the distribution of the defects is no longer isotropic; a description is given in particular of the scattering which occurs when 1.625 < c/a < 1.645. It appears that the defects start to congregate and cause pronounced distortion of the lattice. The defects are stabilized in the form of large aggregates only when a later irradiation stage is reached. (author) [French] Les diagrammes de rayons X obtenus a l'aide d'echantillons frittes de BeO irradies aux neutrons (E > 1 MeV) peuvent etre classes en trois types qui dependent de la valeur du rapport c/a, quelles que soient les caracteristiques du fritte (fritte sous charge ou fritte naturel, densite et taille de grains variables, BeO pur ou avec additions). La dilatation anisotrope de la maille de BeO observee par irradiation ne depend pas seulement de la dose recue, mais aussi des etats de contraintes intergranulaires des echantillons; ainsi les frittes qui resistent le mieux sous irradiation sont les frittes naturels a forte densite et a petits grains pour lesquels le rapport c/a varie peu en fonction de la dose d'irradiation. Les diagrammes de monocristaux presentent la meme classification que les frittes en fonction du rapport c/a. De plus, on met en evidence des diffusions de rayons X en dehors des reflexions de Bragg. Lorsque ces diffusions apparaissent,la distribution des defauts n'est plus isotrope; on decrit principalement les diffusions observees lorsque 1,625 < c/a < 1,645. On doit admettre un debut de rassemblement des defauts avec des distorsions tres importantes du reseau. Les defauts ne seraient stabilises sous forme de grands amas plans que pour un stade d'irradiation ulterieure. (auteur)}
place = {France}
year = {1966}
month = {Jul}
}