Electron paramagnetic resonance and luminescence of Gd3+ in the mixed fluorides Ca1-xLaxF2+x and Ca1 |
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| Authors: | R Alcala P J Alonso B Sobolev |
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| Institution: | 1. Institute de Ciencia de Materiales de Aragón, U. Zaragoza-C.S.I.C.) Facultad de Ciencias. , 50009, Zaragoza, SPAIN;2. Institute of Crystallography, Academy of Science of USSR. , Moscow., USRR |
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| Abstract: | Abstract In this paper we present an study on the EPR and photoluminiscence spectra of Gd3+ in the mixed crystals Ca0.998-xRxGd0.002F0.002+x(x≤0.35, R=La or Y). For x <0.1 the EPR spectrum shows a main signal due to cubic Gd3+ that is broadened as x increases. Different broadenings are found for La and Y samples For high x values the EPR spectrum is similar to that in glass matrices. The results are explained taking to account a random second rank crystal field due to the extra charges associated with R3+ and fluorine intersitials. The 6P→6S emission of Gd3+ also has been measured. The influence of R concentration on this luminiscence has been studied. |
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