Home > Publications database > Probing structural homogeneity of La$_{1-x}$Gd$_{x}$PO$_{4}$ monazite-type solid solutions by combined spectroscopic and computational studies > print |
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100 | 1 | _ | |a Huittinen, N. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
245 | _ | _ | |a Probing structural homogeneity of La$_{1-x}$Gd$_{x}$PO$_{4}$ monazite-type solid solutions by combined spectroscopic and computational studies |
260 | _ | _ | |a Amsterdam [u.a.] |c 2017 |b Elsevier Science |
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520 | _ | _ | |a Here we study the homogeneity of Eu3+-doped La1-xGdxPO4 (x = 0, 0.11, 0.33, 0.55, 0.75, 0.92, 1) monazite-type solid solutions by a combination of Raman and time-resolved laser fluorescence spectroscopies (TRLFS) with complementary quasi-random structure-based atomistic modeling studies. For the intermediate La0.45Gd0.55PO4 composition we detected a significant broadening of the Raman bands corresponding to the lattice vibrations of the LnO9 polyhedron, indicating much stronger distortion of the lanthanide cation site than the PO4 tetrahedron. A distortion of the crystal lattice around the dopant site was also confirmed in our TRLFS measurements of Eu3+ doped samples, where both the half width (FWHM) of the excitation peaks and the 7F2/7F1 ratio derived from the emission spectra increase for intermediate solid-solution compositions. The observed variation in FWHM correlates well with the simulated distribution of Eu···O bond distances within the investigated monazites. The combined results imply that homogenous Eu3+-doped La1-xGdxPO4 monazite-type solid solutions are formed over the entire composition range, which is of importance in the context of using these ceramics for immobilization of radionuclides. |
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773 | _ | _ | |a 10.1016/j.jnucmat.2017.01.024 |g Vol. 486, p. 148 - 157 |0 PERI:(DE-600)2001279-2 |p 148 - 157 |t Journal of nuclear materials |v 486 |y 2017 |x 0022-3115 |
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