Increased Loading of Eu3+ Ions in Monazite LaVO4 Nanocrystals via Pressure-Driven Phase Transitions

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• 作者：Pooja Gangwar ; Mohnish Pandey ; Sri Sivakumar ; Raj Ganesh S. Pala ; G. Parthasarathy
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：June 5, 2013
• 年：2013
• 卷：13
• 期：6
• 页码：2344-2349
• 全文大小：360K
• 年卷期：v.13,no.6(June 5, 2013)
• ISSN：1528-7505

文摘

The concentration of Eu³⁺ ion/dopant in the LaVO₄ monazite nanocrystal phase cannot be increased by the conventional synthetic procedures. We demonstrate a unique three-step methodology to increase the doping concentration of Eu³⁺ in the LaVO₄ monazite nanocrystals. In the first step, Eu³⁺ is doped (10%) in the zircon LaVO₄ nanocrystal phase, which does not have a limitation in terms of Eu³⁺ ion loading. In the second step, high pressure (5 GPa) is utilized to transform the zircon crystal phase to the monazite phase. In the third step, the pressure is brought back to the atmospheric level, wherein it is observed that the monazite crystal phase is retained in its metastable phase with the 10% Eu³⁺ ion doping concentration. The phase transitions have been characterized via electrical resistivity data, XRD, Raman spectroscopy, fluorescence spectroscopy, TEM, and density functional simulations.