Affordable Access

An iterative procedure for the correction of secondary fluorescence effects in electron-probe microanalysis near phase boundaries

Authors
Publication Date

Abstract

PII: 0584-8547(84)80174-3 Speelrachimiccr AC& Vol. 39B, No. 12, pp. 1517-1522, 1984. 0_584-8547184 so3.00 + .cO Pnatcd in Gnat B&am. 0 1984 Pergamon Press Ltd. An iterative procedure for the correction of secondary fluorescence effects in electron-probe microanalysis near phase boundaries G. F. BASTIN, F. J. J. VAN Loo, P. J. C. VOSTERS and J. W. G. A. VROLIJK Lab. for Physical Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands (Received 17 August 1983) Abstract-A correction procedure is proposed to correct for the effects of characteristic fluorescence in EPMA near phase boundaries. The necessary equations for the simple case of two homogeneous alloys sharing a common interface are given. The equations have been tested in practice and it is shown that they are well suited to predict the apparent concentration of the element suffering from secondary excitation as a function of distance from the boundary. Based on these equations an iterative correction procedure is proposed for application to sloping concentration profiles. The procedure is illustrated on some practical examples and some of the factors connected with its performance are briefly discussed. 1. INTRODUCTION IT IS well-known that the spatial resolution in quantitative electron-probe microanalysis can be badly a&ted by the occurrence of secondary fluorescence, i.e. when the primary excited (electron beam generated) X-radiation of some other element in the matrix is capable of exciting extra X-radiation of the element one is trying to analyse. In such cases the total volume of excitation, which is normally 2-4 pm in diameter, can be increased by one to two orders of magnitude, mainly because of the fact that matter is relatively transparent to X-rays as compared to electrons. The effect is most pronounced in matrices containing elements with atomic numbers differing by two (for Z > 21) like combinations of Fe-Ni, Co-Cu etc. While the established REED [

There are no comments yet on this publication. Be the first to share your thoughts.