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首页> 外文期刊>Physics of the solid state >Effect of preliminary low-temperature annealing on the kinetics of nucleation
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Effect of preliminary low-temperature annealing on the kinetics of nucleation

机译：初步低温退火对成核动力学的影响

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摘要

The changes observed in the kinetics of CuCl nucleation in glass due to preliminary low-temperature annealing have been investigated using optical spectroscopy. The influence of the number of nuclei formed at a temperature of 500°C on the growth rate of the CuCl phase at 650°C has been examined. The amount of the CuCl phase in the sample is determined from the optical absorption coefficient in the range of band-to-band transitions in the CuCl nanocrystals. The average radius of CuCl particles is calculated from the position of the maximum of the exciton band. It has been demonstrated that the preliminary formation of CuCl nuclei at 500°C for 3 h makes it possible to increase the growth rate of the CuCl phase by a factor of 6. In the sample with preliminarily formed nuclei, there occur two opposite processes: thermal decomposition of part of the small nuclei, which have become subcritical at 650°C; and the growth of larger nuclei, which have become supercritical at 650°C due to the diffusive inflow of the components of the new phase. When the equilibrium concentration is reached, the new phase contains particles with a smaller radius but at a higher concentration as compared to those in the case of the conventional nucleation at 650°C.
机译：使用光谱学已经研究了由于初步的低温退火而在玻璃中形成的CuCl成核动力学的变化。已经研究了在500°C的温度下形成的核数量对650°C下CuCl相的生长速率的影响。样品中CuCl相的含量由CuCl纳米晶体中带间跃迁范围内的光吸收系数确定。根据激子带的最大值的位置计算出CuCl颗粒的平均半径。已经证明，在500°C下持续3 h初步形成CuCl核，可以使CuCl相的生长速率提高6倍。在预先形成核的样品中，发生两个相反的过程：小核的一部分热分解，这些小核在650°C变为亚临界状态;以及较大核的生长，由于新相各组分的扩散流入，较大核在650°C变得超临界。当达到平衡浓度时，与在650℃下常规成核的情况相比，新相包含半径较小但浓度较高的颗粒。

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