The synthesis of Ce_1−xLn_xO_2−y (Ln=Pr, Sm, Gd, Tb) nanocubes by hydrothermal methods

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• 作者：Oksana Mendiuk ; Marcin Nawrocki ; Leszek Kepinski ; ^{L.Kepinski@int.pan.wroc.pl" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ln doped ceria nanocubes ; Nanocrystalline Ce1&minus ; xLnxO2&minus ; y ; Hydrothermal synthesis ; Ce doped Ln(OH)3 nanorods
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：1998-2012
• 全文大小：6300 K

文摘

The synthesis of Ce_1−xLn_xO_2−y (Ln=Pr, Sm, Gd, Tb) cube shape nanoparticles by hydrothermal and microwave assisted hydrothermal method is described. The effect of the Ln doping on morphology and the phase composition of ceria was studied by XRD, electron microscopy and Raman spectroscopy. Up to certain Ln content x=x_m (depending on Ln), the hydrothermal treatment at 220 °C for 24 h produces nanocubes of the mixed Ce–Ln oxide, while at higher Ln content rod-like particles of Ln(OH)₃ occur as a second phase. Morphology and size distribution of ceria nanocubes depend on the kind and amount of Ln dopant. Generally, the size distribution of ceria nanocubes narrows for x≥0.2, with simultaneous rounding of the cubes׳ edges and corners. Unexpectedly, noticeable number of very large, well-develop ceria nanocubes (up to 300 nm) formed for small addition of Gd or Sm (x<0.1). The microwave assisted hydrothermal method enables the synthesis of the Ce_1−xLn_xO_2−y nanocubes at significantly shorter time (3 h), but with higher content of the mixed (Ln,Ce)(OH)3 hydroxide as a second phase. The effect of the lanthanide doping on mechanism of formation of Ce_1−xLn_xO_2−y nanocubes is discussed within the framework of the oriented attachment model.