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- W2970070963 abstract "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 °C. Silica shells were grown on these particles (average size: ∼270 nm) with well-defined thicknesses (26 to 61 nm) using a seeded-growth Stöber approach. To study the thermal stability of bare ZrO2 cores and ZrO2@SiO2 core-shell particles they were calcined at 450 to 1200 °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 °C. Increasing the temperature to 600 °C transformed them to monoclinic. Finally, grain coarsening destroyed the spheroidal particle shape after heating to 800 °C. In striking contrast, SiO2-encapsulation significantly inhibited grain growth and the t → m transition progressed considerably only after heating to 1000 °C, whereupon the particle shape, with a smooth silica shell, remained stable. Particle disintegration was observed after heating to 1200 °C. Thus, ZrO2@SiO2 core-shell particles are suited for high-temperature applications up to ∼1000 °C. Different mechanisms are considered to explain the markedly enhanced stability of ZrO2@SiO2 core-shell particles." @default.
- W2970070963 created "2019-09-05" @default.
- W2970070963 creator A5005302404 @default.
- W2970070963 creator A5013918024 @default.
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- W2970070963 creator A5085278221 @default.
- W2970070963 creator A5061149116 @default.
- W2970070963 date "2019-01-01" @default.
- W2970070963 modified "2023-10-10" @default.
- W2970070963 title "Synthesis and thermal stability of ZrO<sub>2</sub>@SiO<sub>2</sub> core–shell submicron particles" @default.
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- W2970070963 doi "https://doi.org/10.1039/c9ra05078g" @default.