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首页> 外文期刊>Journal of Materials Research >Fractal aggregates of lanthanide-doped Y_2O_3 nanoparticles obtained by propellant synthesis
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Fractal aggregates of lanthanide-doped Y_2O_3 nanoparticles obtained by propellant synthesis

机译：推进剂合成镧掺杂Y_2O_3纳米粒子的分形聚集体

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摘要

Y_2-xLn_xO_3 (Ln=Ce, Pr, Nd, Eu, Gd, Ho, and Er) powders obtained by propellant synthesis have been characterized using small-angle x-ray scattering, wide-angle x-ray scattering, and transmission and scanning electron microscopy. All the samples showed a very porous, open microstructure with fractal scaling properties. The building blocks of the fractal aggregates are nanocrystallites of lanthanide-doped Y_2O_3, with variations in the cubic lattice constant proportional to the composition of the solid solution and to the lanthanide ionic radius. The particles had a narrow distribution of sizes with an average value in the 20-50 nm range. They are made of a core of 10-20 nm, consisting of almost perfectly ordered crystals and a "fuzzy" layer, characterized by either a growing lattice disorder or by a compositional gradient. From this dimension, up to at least 200 nm, the particle aggregate is a mass fractal with a fractal dimension, D_f, in the 1.6-2.0 range.
机译：通过小角度X射线散射，广角X射线散射以及透射和扫描对通过推进剂合成获得的Y_2-xLn_xO_3（Ln = Ce，Pr，Nd，Eu，Gd，Ho和Er）粉末进行了表征电子显微镜。所有样品均显示出非常多孔的，具有分形结垢性质的开放微结构。分形聚集体的组成部分是掺杂镧系元素的Y_2O_3的纳米微晶，立方晶格常数的变化与固溶体的组成以及镧系元素的离子半径成正比。颗粒具有窄的尺寸分布，其平均值在20-50nm范围内。它们由10至20 nm的核组成，由几乎完美有序的晶体和“模糊”层组成，其特征是晶格无序生长或成分梯度增加。从这个尺寸开始，直到至少200 nm，粒子集合体才是质量分形，其分形维数D_f在1.6-2.0范围内。

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