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. , ...Daha Fazla

X-RAY SPECTROMETRY, cilt.32, ss.363-366, 2003 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 32 Konu: 5
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1002/xrs.652
  • Dergi Adı: X-RAY SPECTROMETRY
  • Sayfa Sayıları: ss.363-366

Özet

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.