Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-2155 - C7-2158
DOI http://dx.doi.org/10.1051/jp4:19937342
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-2155-C7-2158

DOI: 10.1051/jp4:19937342

Multivariate ALCHEMI in the presence of anti-site defects

M.G. WALLS

CNRS, Centre d'Etudes de Chimie Métallurgique, 15 rue Georges Urbain, 94407 Vitry-sur-Seine cedex, France


Abstract
It is shown that a recently developed formulation of ALCHEMI, which takes into account the x-ray signal delocalisation effects, is not suitable for adaptation to the case of anti-site defect density determinations. However, the multivariate formulation of the method ALCHEMI is then applied to an Ni-Fe-Cr ordered alloy sample containing significant numbers of anti-site defects, and whose site distributions for all three elements were known in advance. In this way the importance of the presence of such defects is quantitatively determined for a real case. It is found that for this sample, the errors introduced are less than those arising from other sources, and it appears likely that in general the method can tolerate fairly high defect levels for compounds of host stoichiometry AxB where x is 3 or higher.



© EDP Sciences 1993