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- W2024338908 abstract "The high resolution and polarized absorption spectroscopic data of Nd 3+ -doped, Mg 2+ -compensated strontium hexa-aluminate Sr1−x NdyLax−yMg x Al12−x O19 (ASL: Nd) crystals in an extended compositional range (0.01 x 0.5) are presented. This crystal offers for the Nd 3+ ions a unique crystallographic site (2d) with 12 O 2− coordination and ideal D3h symmetry. The optical spectra in all this compositional range contain contributions from two families of structural centres, C1 and C2 (with two components Cand C �� ), whose spectral features are mainly dependent on the composition parameter x .T hepresence of these centres is attributed to the cationic disorder. It is inferred that while the centres C1 and C2 are connected with the presence or absence of trivalent ions in the neares t( 2d) coordination sphere normally occupied by Sr 2+ ,t he two components Cand C �� are associated to the existence or lack of Mg 2+ ions in the nearest sphere of Al 3+ tetrahedral (Al 3+) sites. This structural disorder leads to crystal-field perturbations by electric charge difference, although for C1 centres the perturbation by ionic size differences is also evident. The polarized spectroscopy indicates departures from the selection rules for D3h symmetry for C1 centres, whereas both polarized spectra and crystal-field analysis confirm the near-D3h symmetry for C2 centres. The composition dependence of the spectra indicates that the distribution of the La 3+ and Nd 3+ ions at the (2d) site si sr andom, while that of the Mg 2+ in the Al 3+ sites is correlated with the former. The connection of this structural model with the EPR data and with earlier models is discussed." @default.
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- W2024338908 date "2005-12-14" @default.
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- W2024338908 title "Disorder effects in Nd3+-doped strontium hexa-aluminate laser crystals" @default.
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- W2024338908 doi "https://doi.org/10.1088/0953-8984/18/2/017" @default.
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