XPS study of the phase transition in pure zirconium oxide nanocrystallites
XPS study of the phase transition in pure zirconium oxide nanocrystallites
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DOI：
10.1016/j.apsusc.2005.03.183
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发表时间：
2005-12
影响因子：
6.7
通讯作者：
S. Tsunekawa;K. Asami;S. Ito;M. Yashima;T. Sugimoto
中科院分区：
文献类型：
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作者：
S. Tsunekawa;K. Asami;S. Ito;M. Yashima;T. Sugimoto
通过在120°C下的热水解和/或在125-1025°C下的热处理，由超细金属-有机络合物制备直径为6- 140 nm的纯氧化锆纳米晶体。X射线光电子能谱表明，Zr的有效离子价随粒径的减小而降低。离子价态的尺寸依赖性表明，从立方相到四斜相的相变发生在直径为3 nm附近的有效Zr价态为2.0处，从四斜相到单斜相的相变发生在直径为25 nm的临界尺寸处，有效Zr价态约为2.6。
Pure zirconium oxide nanocrystallites with diameters 6–140nm are fabricated from ultrafine metallo-organic complexes by thermal hydrolysis at 120°C and/or heat treatment at 125–1025°C. X-ray photoelectron spectroscopy shows that effective ionic valence of Zr decreases with decreasing particle diameter. The size dependence of the ionic valences suggests that the phase transition from cubic to tetragonal occurs at an effective Zr valence of 2.0 near 3nm in diameter and that the phase transition from tetragonal to monoclinic takes place at a critical size of 25nm diameter with an effective Zr valence of about 2.6.