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Synthesis and thermal stability of ZrO2@SiO2 core-shell submicron particles

机译：ZrO2纤维壳亚微米粒子的合成与热稳定性

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ZrO2@SiO2 core-shell submicron particles are promising candidates for the development of advanced optical materials. Here, submicron zirconia particles were synthesized using a modified sol-gel method and pre-calcined at 400 degrees C. Silica shells were grown on these particles (average size: similar to 270 nm) with well-defined thicknesses (26 to 61 nm) using a seeded-growth Stober approach. To study the thermal stability of bare ZrO2 cores and ZrO2@SiO2 core-shell particles they were calcined at 450 to 1200 degrees C. After heat treatments, the particles were characterized by SEM, TEM, STEM, cross-sectional EDX mapping, and XRD. The non-encapsulated, bare ZrO2 particles predominantly transitioned to the tetragonal phase after pre-calcination at 400 degrees C. Increasing the temperature to 600 degrees C transformed them to monoclinic. Finally, grain coarsening destroyed the spheroidal particle shape after heating to 800 degrees C. In striking contrast, SiO2-encapsulation significantly inhibited grain growth and the t -> m transition progressed considerably only after heating to 1000 degrees C, whereupon the particle shape, with a smooth silica shell, remained stable. Particle disintegration was observed after heating to 1200 degrees C. Thus, ZrO2@SiO2 core-shell particles are suited for high-temperature applications up to similar to 1000 degrees C. Different mechanisms are considered to explain the markedly enhanced stability of ZrO2@SiO2 core-shell particles.
机译：ZrO2 @ SiO2核心壳亚微米粒子是高级光学材料开发的承诺候选人。这里，使用改性溶胶 - 凝胶法合成亚微米氧化锆颗粒，并在400℃下预煅烧，在这些颗粒（平均尺寸：270nm上）生长二氧化硅壳，具有明确定义的厚度（26至61nm）使用种子生长的阶级方法。为了研究裸ZrO2芯的热稳定性和ZrO2核 - 壳颗粒，在450至1200摄氏度下煅烧它们。在热处理后，通过SEM，TEM，茎，横截面EDX映射，以及XRD的特征。 。在400℃的预煅烧后，非包封的裸ZrO2颗粒主要过渡到预煅烧后的四方相。将温度升至600℃，将它们转化为单斜。最后，在加热到800℃后，晶粒粗化破坏了球形颗粒形状。在引人注目的对比中，SiO2 - 包封显着抑制晶粒生长，并且在加热到1000摄氏度后，T - > M转变显着进展，随后光滑的二氧化硅壳，保持稳定。在加热至1200℃后观察到颗粒崩解。因此，ZrO 2核 - 壳颗粒适用于高温应用，该颗粒高达1000℃。认为不同的机制可以解释ZrO2 @ SiO2核的显着增强的稳定性 - 壳颗粒。

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    《RSC Advances》 |2019年第46期|共13页
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  • 正文语种 eng
  • 中图分类 化学;
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