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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Magnetic resonance study of the crystallization behavior of InF3-based glasses doped with Cu2+, Mn2+ and Gd3+
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Magnetic resonance study of the crystallization behavior of InF3-based glasses doped with Cu2+, Mn2+ and Gd3+

机译：掺杂Cu2 +，Mn2 +和Gd3 +的InF3基玻璃的结晶行为的磁共振研究

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The crystallization of fluoroindate glasses doped with Gd3+, Mn2+ and Cu2+ heat treated at different temperatures, ranging from the glass transition temperature (T-g) to the crystallization temperature (T,), are investigated by electron paramagnetic resonance (EPR) and F-19 nuclear magnetic resonance (NMR). The EPR spectra indicate that the Cu2+ ions in the glass are located in axially distorted octahedral sites. In the crystallized glass, the g-values agreed with those reported for Ba2ZnF6, which correspond to Cu2+ in a tetragonal compressed F- octahedron and to Cu2+ on interstitial sites with a square-planar F- co-ordination. The EPR spectra of the Mn2+ doped glasses exhibit a sextet structure due to the Mn2+ hyperfine interaction. These spectra suggest a highly ordered environment for the Mn 2+ ions (close to octahedral symmetry) in the glass. The EPR spectra of the recrystallized sample exhibit resonances at the same position, suggesting that the Mn2+ ions are located in sites of highly symmetric crystalline field. The increase of the line intensity of the sextet and the decrease of the background line in the thermal treated samples suggest that the Mn2+ ions move to the highly ordered sites which contribute to the sextet structure. The EPR spectra of the Gd3+ doped glasses exhibit the typical U-spectrum of a s-state ion in a low symmetry site in disordered systems. The EPR of the crystallized glasses, in contrast, have shown a strong resonance in g approximate to 2.0, suggesting Gd3+ ions in environment close to cubic symmetry. The F-19 NMR spin-lattice relaxation rates were also strongly influenced by the crystallization process that takes over in samples annealed above T-c. For the glass samples (doped or undoped) the F-19 magnetization recoveries were found to be adjusted by an exponential function and the spin-lattice relaxation was characterized by a single relaxation of time. In contrast, for the samples treated above T-c, the F-19 magnetization-recovery becomes non-exponential. A remarkable feature our results is that the changes in the Cu, Mn, Gd3+ EPR spectra and NMR relaxation, are always observed for the samples annealed above Tc. (c) 2006 Elsevier B.V. All rights reserved.
机译：通过电子顺磁共振（EPR）和F-19核能研究了在从玻璃化转变温度（Tg）到结晶温度（T，）的不同温度下进行热处理的，掺有Gd3 +，Mn2 +和Cu2 +的氟代玻璃的结晶。磁共振（NMR）。 EPR光谱表明，玻璃中的Cu2 +离子位于轴向变形的八面体位置。在结晶玻璃中，g值与报道的Ba2ZnF6值相符，g值对应于四方压缩F-八面体中的Cu2 +，以及间隙位置具有方形平面F-配位的Cu2 +。 Mn2 +掺杂玻璃的EPR光谱由于Mn2 +超精细相互作用而呈现出六重结构。这些光谱表明玻璃中的Mn 2+离子具有高度有序的环境（接近八面体对称性）。重结晶样品的EPR谱在相同位置显示出共振，表明Mn2 +离子位于高对称晶场的位置。热处理样品中六边形线强度的增加和背景线的减少表明Mn2 +离子移动到有助于六边形结构的高度有序的位置。掺杂Gd3 +的玻璃的EPR光谱在无序系统的低对称位置显示出典型的S态离子U谱。相比之下，结晶玻璃的EPR在g接近2.0时表现出强烈的共振，表明环境中的Gd3 +离子接近立方对称。 F-19 NMR自旋晶格弛豫速率也受到在T-c以上退火的样品中接管的结晶过程的强烈影响。对于玻璃样品（掺杂或未掺杂），发现F-19的磁化恢复可通过指数函数进行调整，并且自旋晶格弛豫的特征在于时间的一次弛豫。相反，对于经过T-c处理的样品，F-19的磁化恢复率不是指数级的。我们的结果的显着特点是，始终在高于Tc退火的样品中观察到Cu，Mn，Gd3 + EPR光谱和NMR弛豫的变化。 （c）2006 Elsevier B.V.保留所有权利。

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