Ce^(3+)掺杂La_2O_3的^(17)O固体核磁共振研究

^(17)O Solid-State NMR Studies of Ce^(3+) Doped La_2O_3

本文用水热共沉淀法制备Ce3+掺杂La2O3的前驱体,随后在H2/N2气氛下用高温煅烧法合成了不同Ce3+浓度的掺杂La2O3。由于Ce3+的掺杂,17O固体核磁共振谱图中在698、650和558处出现了新的共振峰;随着Ce3+掺杂浓度的增加,这些峰的强度也随之增强。根据谱峰位置和强度,对谱图进行了归属:698、650处的共振峰应源自与Ce3+相连的四配位O(OCeLa3),558处的信号则来自于与Ce3+相连的六配位O(OCeLa5)。通过17O固体核磁共振能够直接观测与Ce3+直接相连的O显示该方法将可能用于研究稀土掺杂氧化物功能材料。

In this paper, La203 doped with varied Ce3＋ concentrations were synthesized via hydrothermal co- precipitation followed by high temperature calcined process in H2/N2 atmosphere. Three new peaks show up at 698, 650 and 558 in 17O solid state NMR spectra due to Ce3＋ doping. The intensies of these peaks increase with Ce3＋ concentration. According to the resonant frequencies and the intensities, the peaks at around 698 and 650, and 558 are assigned to four-coordinated OCeLa3 and six-coordinated OCeLa5 species, respectively. The results show that 170 solid-state NMR spectroscopy can be used to study rare earth doped oxides for applicable functional materials.