Structure control of low melting point materials using a gravity field

本研究利用重力辅助脉冲激光烧蚀（GAPLA）方法制备了一种由低熔点材料组成的成分梯度薄膜。虽然组成梯度效应变得比高熔点材料的情况小，但结果表明GAPLA方法在低熔点材料的组成梯度中也是有效的。此外，很明显，通过GAPLA方法的成分梯度过程不是基于扩散理论。这一结果表明，材料的熔点与成分梯度效应几乎没有关系。然而，获得了一个重要的知识，即组成梯度的程度由每个组成元素的烧蚀特性的差异决定。

In this study, gravity assisted pulsed laser ablation(GAPLA) method is used to fabricate a compositional gradient thin film which consists of low melting point material. Although a composition gradient effect became smaller than the case of high melting point material, it turned out that the GAPLA method is effective also in the composition gradient of low melting point material. Furthermore, it became clear that the composition gradient process by the GAPLA method is not based on diffusion theory. This result means that there is almost no relation of the melting point of material and the composition gradient effect. However, it is acquired an important knowledge that the degree of composition gradient is decided by the difference in ablation characteristic of each constituent element.