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首页> 美国卫生研究院文献>Materials >Microstructural Evolution of Dy2O3-TiO2 Powder Mixtures during Ball Milling and Post-Milled Annealing
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Microstructural Evolution of Dy2O3-TiO2 Powder Mixtures during Ball Milling and Post-Milled Annealing

机译：Dy2O3-TiO2粉末混合物在球磨和后磨退火中的组织演变

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摘要

The microstructural evolution of Dy2O3-TiO2 powder mixtures during ball milling and post-milled annealing was investigated using XRD, SEM, TEM, and DSC. At high ball-milling rotation speeds, the mixtures were fined, homogenized, nanocrystallized, and later completely amorphized, and the transformation of Dy2O3 from the cubic to the monoclinic crystal structure was observed. The amorphous transformation resulted from monoclinic Dy2O3, not from cubic Dy2O3. However, at low ball-milling rotation speeds, the mixtures were only fined and homogenized. An intermediate phase with a similar crystal structure to that of cubic Dy2TiO5 was detected in the amorphous mixtures annealed from 800 to 1000 °C, which was a metastable phase that transformed to orthorhombic Dy2TiO5 when the annealing temperature was above 1050 °C. However, at the same annealing temperatures, pyrochlore Dy2Ti2O7 initially formed and subsequently reacted with the remaining Dy2O3 to form orthorhombic Dy2TiO5 in the homogenous mixtures. The evolutionary mechanism of powder mixtures during ball milling and subsequent annealing was analyzed.
机译：使用XRD，SEM，TEM和DSC研究了Dy2O3-TiO2粉末混合物在球磨和后磨退火过程中的组织演变。在高球磨转速下，将混合物细化，均质，纳米结晶，然后完全非晶化，并观察到Dy2O3从立方晶体转变为单斜晶体结构。无定形转化是由单斜晶Dy2O3引起的，而不是立方Dy2O3。然而，在低的球磨转速下，仅将混合物细化和均质化。在800至1000°C退火的非晶态混合物中检测到具有与立方Dy2TiO5相似的晶体结构的中间相，当退火温度高于1050°C时，该中间相为亚稳相，转变为正交晶Dy2TiO5。然而，在相同的退火温度下，烧绿石Dy2Ti2O7最初形成，随后与剩余的Dy 2 O 3 反应形成正交晶型Dy 2 TiO <均匀混合物中的sub> 5 。分析了球磨和后续退火过程中粉末混合物的演变机理。

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