Structure and grain growth of TiO2 nanoparticles investigated by electron and x-ray diffractions and Ta181 perturbed angular correlations
Structure and grain growth of TiO2 nanoparticles investigated by electron and x-ray diffractions and Ta181 perturbed angular correlations
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通过电子和 X 射线衍射以及 Ta181 扰动角相关性研究 TiO2 纳米粒子的结构和晶粒生长
DOI：
10.1063/1.2214182
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发表时间：
2006
影响因子：
3.2
通讯作者：
M. Forker
中科院分区：
文献类型：
--
作者：
S. Schlabach;D. Szabó;D. Vollath;P. Presa;M. Forker
1300K后裸露和包覆的纳米粒子粒径d100 nm的PAC谱表明，随着温度的升高，最初的无序状态转变为有序的金红石型纳米₂。数据表明，开始有序化过程的临界晶粒度为d~10 nm。粗晶二氧化钛₂的光谱在粒径为d>；=30 nm时达到。在包覆了Al-₂和₂-O-₃的纳米粒子中，随着温度的升高，包覆层和核心层都发生了生长，但包覆层的核层生长却比未包覆的小得多。用化学气相沉积的方法研究了不同温度下纳米₂芯材和₂涂层中的QI。结果表明，在不同温度下，纳米₂/₂涂层中的QI均为零。这些数据表明，尽管包覆颗粒随着温度的升高而增长，但有序化过程受到阻碍，可能是由于TiO₂晶核和涂层之间的固相反应所致。
Bare and coated TiO₂ nanoparticles with particle sizes d 100 nm after 1300 K. PAC spectra taken in the same temperature range show that with increasing temperature, the initially disordered state transforms to well-ordered rutile TiO₂. The data suggest a critical grain size of d ~10 nm for the onset of the ordering process. The spectra of coarse-grained TiO₂ are reached at a particle size d >= 30 nm. In n-TiO₂ coated with Al₂O₃ and ZrO₂ both the cores and the coatings were found to grow with increasing temperature; the cores of the coated particles, however, grow much less than those of the noncoated particles. The PAC method was used to investigate the QI in both TiO₂ cores and in the ZrO₂ coating of n-TiO₂/ZrO₂ at different temperatures. These data suggest that although the coated particles grow with temperature, the ordering process is obstructed, possibly by a solid state reaction between the TiO₂ kernels and the coatings.