Effects of molten-salt processing parameters on the structural and optical properties of preformed La2Zr2O7:Eu3+ nanoparticles
Effects of molten-salt processing parameters on the structural and optical properties of preformed La2Zr2O7:Eu3+ nanoparticles
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DOI：
10.1016/j.ceramint.2019.09.098
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发表时间：
2020-02
影响因子：
5.2
通讯作者：
Mitzy A. Penilla Garcia;S. Gupta;Yuanbing Mao
中科院分区：
文献类型：
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作者：
Mitzy A. Penilla Garcia;S. Gupta;Yuanbing Mao
熔盐法已经被用于合成各种功能材料，但还没有被用来调节预制颗粒的结构、尺寸和性能。为了填补这一知识空白，在本研究中，我们使用熔盐介质对已经通过熔盐合成方法(MSS)形成的预制La2Zr2O7：5%Eu3+纳米颗粒进行再处理。熔盐处理是在不同的处理时间、温度和介质条件下进行的。具体地说，在所研究的熔盐处理时间(0 h-24 h)内，在800°C下，3 h可提供最佳的光学输出。根据所研究的熔盐处理温度(650 °C~1100 °C)3 h，确定800 °C是最理想的退火温度。对于所研究的熔盐处理介质(氯化硝酸盐)，在3 h和800 °C下，在氯化物中处理的纳米颗粒获得了更好的发光结果。根据熔盐处理的La2Zr2O7：5%Eu3+颗粒的晶体尺寸、晶体结构、结晶度、缺陷和团聚特性之间的平衡，解释了在每个工艺参数下光学性质的变化。我们期待这项研究将激励其他科学家进一步探索熔盐处理作为一种有效的合成后方法来微调预制颗粒的结构、粒度和性能，以满足功能材料的需求。
Molten-salt method has been used to synthesize various functional materials, but it has not been employed to adjust the structure, particle size, and properties of preformed particles. To fill the knowledge gap, in this study, we use a molten-salt medium to reprocess preformed La2Zr2O7:5%Eu3+nanoparticles which were already formed by a molten-salt synthesis (MSS) method. The molten-salt processing is conducted under various conditions in terms of processing time, temperature, and medium. Specifically, within the studied molten-salt processing time (0 h–24 h) at 800°C, 3 h was found to offer the best optical output. In terms of the investigated molten-salt processing temperature (650 °C–1100 °C) for 3 h, 800 °C was identified as the most desirable annealing temperature. Regarding the explored molten-salt processing media (nitratevs.chloride) at 3 h and 800 °C, better luminescence results were obtained for nanoparticles processed in chloride. Under each processing parameter, the change of optical properties is explained based on the balance among the crystalline size, crystal structure, crystallinity, defect, and agglomeration characteristics of the molten salt processed La2Zr2O7:5%Eu3+particles. We expect this study will excite other scientists to further explore molten-salt processing as an effective post-synthesis method to fine-tune the structure, particle size, and properties of preformed particles to meet the demand of functional materials.