Electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) have been used to investigate the surrounding of the activator ion Eu2+ in single crystals of the X-ray storage phosphor BaFBr. An analysis of the Eu2+ superhyperfine interaction with the next fluorine neighbours showed that Eu2+ substitutes for Ba2+ and is not shifted from a regular position within experimental error, in spite of the large difference in ionic radii. EPR and ENDOR investigations on BaFBr:Eu2+ powders established that different methods of producing these materials have no influence on the local environment of Eu2+.
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Assmann et al. (1999) studied this question.
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