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Crystallite size-dependent phases in nanocrystalline ZrO2-Sc2O3

机译:纳米ZrO2-Sc2O3中微晶尺寸相关的相

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ZrO2-10, 12 and 14 mol% Sc2O3 nanopowders were prepared by using a nitrate-lysine gel-combustion synthesis. These materials were studied by synchrotron X-ray powder diffraction (SXPD) and Raman spectroscopy after calcination at different temperatures from 650 to 1200 °C, which led to samples with different average crystallite sizes, up to about 100 nm. The results from SXPD and Raman analyses indicate that, depending on Sc2O3 content, the metastable t"-form of the tetragonal phase or the cubic phase are fully retained at room temperature in nanocrystalline powders, provided an average crystallite sizes lower than ~30 nm. By contrast, powders with larger average crystallite sizes exhibit the stable rhombohedral, β and γ, phases and do not retain or very partially retain the metastable t" and cubic ones.
机译:通过使用硝酸赖氨酸凝胶燃烧合成法制备了ZrO2-10、12和14 mol%Sc2O3纳米粉。在650至1200°C的不同温度下煅烧后,通过同步加速器X射线粉末衍射(SXPD)和拉曼光谱研究了这些材料,从而导致样品具有不同的平均微晶尺寸,最大至约100 nm。 SXPD和拉曼分析的结果表明,根据Sc2O3的含量,在室温下,纳米晶体粉末中四方相或立方相的亚稳态t“型可完全保留,其平均晶粒尺寸小于〜30 nm。相反,具有较大平均晶粒尺寸的粉末表现出稳定的菱形,β和γ相,并且不保留或不完全保留亚稳的t”和立方相。

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