Rapid synthesis of nanocrystalline YAG via microwave-assisted solvothermal process

Rapid synthesis of nanocrystalline YAG via microwave-assisted solvothermal process
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微波辅助溶剂热法快速合成纳米晶YAG

DOI:
10.1111/jace.15815
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发表时间:
2018
影响因子:
3.9
通讯作者:
Ramanujam P
Ramanujam P
中科院分区:
材料科学2区
文献类型:
--
作者:
Ramanujam P

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首次采用亚临界条件和微波辐射相结合的方法,发展了一种制备纳米晶钇铝石榴石(nYAG)颗粒的快速合成方法。据信,丁二醇的使用由于其低分压而延迟了压力上升的开始,而微波促进了纳米晶YAG颗粒在溶剂介质中的选择性结晶。发现这种方法鼓励快速体成核,具有最小的颗粒生长或nYAG颗粒的团聚。使用XRD和TEM分析检查的所得粉末特性显示,需要保持压力和温度条件的窄窗口,以获得尺寸范围为60 - 80 nm的球形颗粒,而不形成任何中间相。STEM/EDX和FTIR结果表明,成核YAG颗粒被碳云掩盖,直到它们完全结晶成单相YAG颗粒;这使得它们分散在水中,几乎没有团聚。
A rapid synthesis procedure for the preparation of nanocrystalline yttrium aluminium garnet (nYAG) particles has been developed, for the first time, using the combination of subcritical conditions and microwave irradiation. It is believed that the use of butanediol delayed the onset of pressure rise due to its low partial pressure, while the microwaves facilitated a selective crystallization of nanocrystalline YAG particles in the solvent medium. This methodology was found to encourage rapid bulk nucleation with minimal particle growth or agglomeration of nYAG particles. The resultant powder characteristics, examined using XRD and TEM analyses, revealed that a narrow window of pressure and temperature conditions needed to be maintained to achieve spherical particles in the size range 60‐80 nm without any intermediate phases being formed. The STEM/EDX and FTIR results obtained suggested that the nucleated YAG particles were masked by carbon clouds until they were completely crystallized into single phase YAG particles; this allowed them to be dispersed in water with little agglomeration.
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