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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Deters, Heinz [1, 2] ; de Camargo, Andrea S. S. [3, 1] ; Santos, Cristiane N. [3] ; Eckert, Hellmut [1]
Total Authors: 4
Affiliation:
[1] WWU Munster, Inst Phys Chem, D-48149 Munster - Germany
[2] WWU Munster, Grad Sch Chem, D-48149 Munster - Germany
[3] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 114, n. 34, p. 14618-14626, SEP 2 2010.
Web of Science Citations: 11
Abstract

The crystallization of laser glasses in the system (B(2)O(3))(0.6)[(Al(2)O(3))(0.4-y)(Y(2)O(3))(y)] (0.1 <= y <= 0.25) doped with different levels of ytterbium oxide has been investigated by X-ray powder diffraction, differential thermal analysis, and various solid-state NMR techniques. The homogeneous glasses undergo major phase segregation processes resulting in crystalline YBO(3), crystalline YAI(3)(BO(3))(4), and residual glassy B(2)O(3) as the major products. This process can be analyzed in a quantitative fashion by solid-state (11)B, (27)Al, and (89)Y NMR spectroscopies as well as (11)B[(27)Al] rotational echo double resonance (REDOR) experiments. The Yb dopants end up in both of the crystalline components, producing increased line widths of the corresponding (11)B, (27)Al, and (89)Y NMR resonances that depend linearly on the Yb/Y substitution ratio. A preliminary analysis of the composition dependence suggests that the Yb(3+) dopant is not perfectly equipartitioned between both crystalline phases, suggesting a moderate preference of Yb to substitute in the crystalline YBO(3) component. (AU)