ChemInform Abstract: ⁸⁹Y MAS NMR in Red Phosphor, Eu‐Doped Y₂O₂S. Assignment of Peaks Shifted by Paramagnetic Eu³⁺, Spin Lattice Relaxation Time, and Eu Distribution.

Abstract

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Glass-to-Vitroceramic Transition in the Yttrium Aluminoborate System: Structural Studies by Solid-State NMR

“…Figure 10 illustrates that both the LB parameters associated with the YAB phase and the fractional area of the new 27 Al NMR peak scale linearly with the Yb/Y substitution ratio for both vitroceramics. Similar linear dependences on dopant ion concentrations have been observed in Tbdoped yttrium aluminum garnet (YAG), 31 Eu-doped Y 2 O 3 , 32 Eudoped Y 2 O 2 S, 33 and rare-earth-doped pyrochlors 34 and are generally consistent with a random spatial distribution of the rare-earth ions. Figure 10 reveals, in addition, that the respective slopes are always significantly higher in the doped VC-Y10 samples than those in the doped VC-Y20 samples.…”

“…The appearance of separated high-and low-frequency signals as a result of rare-earth doping in inorganic oxidic lattices has been previously reported and attributed to a combination of Fermi-contact and dipolar ("pseudo-contact") shifts. [31][32][33][34] Table 3 summarizes the line broadening parameters LW and the fractional area of the new 27 Al NMR signals for all of the samples investigated. Figure 10 illustrates that both the LB parameters associated with the YAB phase and the fractional area of the new 27 Al NMR peak scale linearly with the Yb/Y substitution ratio for both vitroceramics.…”