Measurement of diffusion coefficients of Ag in YBa2Cu3O7 by the EDXRF technique


DOGAN O., ERTUGRUL M. , Cevik U. , BACAKSIZ E. , TIRASOGLU E. , KOBYA A. İ. , ...More

X-RAY SPECTROMETRY, vol.32, no.5, pp.363-366, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 5
  • Publication Date: 2003
  • Doi Number: 10.1002/xrs.652
  • Title of Journal : X-RAY SPECTROMETRY
  • Page Numbers: pp.363-366

Abstract

The diffusion of Ag in superconducting YBa2Cu3O7 ceramic was studied over the temperature range 700-850degreesC by the energy-dispersive X-ray fluorescence (EDXRF) technique. For the excitation of silver atoms, an annular Am-241 radioisotope source (50 mCi) emitting 59.543 keV photons was used. The temperature dependences of Ag diffusion coefficients in grains (D-1) and over the grain boundaries (D-2) are described by the equations D-1 = 1.4 X 10(-2) exp[-(1.18 +/- 0.10)/kT] and D-2 = 3.1 X 10(-4) exp[-(0.87 +/- 0.10)/kT]. Copyright (C) 2003 John Wiley Sons, Ltd.