CINSO (Centro de Investigaciones en Sólidos), CITEFA-CONICET J.B. de La Salle 4397 (B1603ALO) Villa Martelli, Pcia. de Buenos Aires, Argentina.
Phys Chem Chem Phys. 2010 Mar 28;12(12):2822-9. doi: 10.1039/b922541b. Epub 2010 Jan 27.
ZrO(2)-10, 12 and 14 mol% Sc(2)O(3) 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 degrees 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 Sc(2)O(3) 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 approximately 30 nm. By contrast, powders with larger average crystallite sizes exhibit the stable rhombohedral, beta and gamma, phases and do not retain or very partially retain the metastable t'' and cubic ones.
ZrO(2)-10、12 和 14 mol% Sc(2)O(3)纳米粉末通过硝酸盐-赖氨酸凝胶燃烧合成法制备。这些材料在 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）和拉曼光谱进行了研究，得到了具有不同平均晶粒尺寸的样品，最大可达约 100nm。SXPD 和拉曼分析的结果表明，取决于 Sc(2)O(3)的含量，在室温下，纳米晶粉末中完全保留亚稳的 t''-四方相或立方相，只要平均晶粒尺寸低于约 30nm。相比之下，具有较大平均晶粒尺寸的粉末则呈现出稳定的菱面体、β和γ相，不再保留或仅部分保留亚稳的 t''和立方相。
