Size, structure, and luminescence of Nd2Zr2O7 nanoparticles by molten salt synthesis
Size, structure, and luminescence of Nd2Zr2O7 nanoparticles by molten salt synthesis
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DOI：
10.1007/s10853-019-03745-9
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发表时间：
2019-10
影响因子：
4.5
通讯作者：
J. Zuniga;S. Gupta;Maya Abdou;Héctor A. De Santiago;A. Puretzky;Melonie P. Thomas;B. Guiton;Jue Liu;Yuanbing Mao
中科院分区：
文献类型：
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作者：
J. Zuniga;S. Gupta;Maya Abdou;Héctor A. De Santiago;A. Puretzky;Melonie P. Thomas;B. Guiton;Jue Liu;Yuanbing Mao
随着光电子学、闪烁体材料和声学等多功能应用的发展，人们对焦绿石材料提出了更高的要求。许多报道已经指出了Nd2Zr2O7(NZO)纳米粒子(NPs)合成技术的重要性，但还没有对其相选择性背后的原因做出解释。在这里，我们研究了熔盐法合成的NZO纳米粒子的结构和光学性质。我们合成了尺寸可调的NZO纳米颗粒，并将其颗粒尺寸与其结构行为和光学性能进行了关联。所有NZO纳米粒子都稳定在缺陷的萤石相中。中子衍射提供了氧在重原子存在时的行为的洞察力。由于这些纳米粒子中存在氧空位，我们在紫外光照射下收集到了蓝色和绿色发光的明亮汞齐。我们进行了原位的X射线衍射和拉曼光谱研究，以观察在受控的Ar环境中的温度诱导相变。有趣的是，我们没有观察到熔盐合成的萤石NZO纳米颗粒的相变，但我们直接用原位X射线衍射仪观察到了从前驱体阶段到焦绿石相的相变。这些观察结果为相选择性合成纳米材料在材料科学中的各种应用提供了一种新的策略。
Pyrochlore materials with novel properties are in demand with multifunctional applications such as optoelectronics, scintillator materials, and theranostics. Many reports have already indicated the importance of the synthesis technique for Nd2Zr2O7(NZO) nanoparticles (NPs); however, no explanation has been provided for the reason behind the nature of its phase selectivity. Here, we have explored the structural and optical properties of the NZO NPs synthesized by a molten salt synthesis method. We have synthesized size-tunable NZO NPs and correlated the particle size with their structural behavior and optical performance. All NZO NPs are stabilized in defect fluorite phase. Neutron diffraction provided insight on the behavior of oxygen in the presence of heavy atoms. We have collected bright amalgam of blue and green emission on UV irradiation due to the presence of oxygen vacancies from these NPs. We have carried out in situ XRD and Raman investigations to observe the temperature-induced phase transformation in a controlled argon environment. Interestingly, we have not observed phase change for the molten salt synthesized fluorite NZO NPs; however, we observed phase transformation from a precursor stage to pyrochlore phase by in situ XRD directly. These observations provide a new strategy to synthesize nanomaterials phase-selectively for a variety of applications in materials science.