发表机构
University of New Hampshire; University of Maine（新罕布什尔大学; 缅因大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究探究带Zr粘附层的Pt$_{0.9}$Ni$_{0.1}$薄膜在蓝宝石和langasite衬底上的热驱动形貌演化，发现其粗化行为受衬底影响，400-600°C为主要粗化窗口，热稳定性由多因素耦合决定。
AI 中文摘要
我们研究了带有10 nm Zr粘附层的100 nm厚 Pt$_{0.9}$Ni$_{0.1}$ 合金薄膜在蓝宝石和 langasite 衬底上的热演化过程。从室温到800 °C的连续真空退火会产生衬底依赖型的形貌路径，该路径通过原子力显微镜、图像分割、高度分布分析和有效粗化度量进行量化。两种薄膜在400 °C以下均保持致密颗粒状，在400至600 °C之间发生急剧的粗化转变，并在800 °C时演变为合并的 faceted 微晶。langasite 上的平均投影特征面积从7.84×10² nm²增加到1.09×10⁵ nm²，蓝宝石上则从3.32×10² nm²增加到1.67×10⁵ nm²。因此，蓝宝石形成更大的 faceted 微晶，而 langasite 在600 °C时表现出更大的粗糙度最大值。面积分布表明，400-600 °C的转变并未均匀改变初始颗粒群体，而是将其替换为截然不同的大特征集合。高度和粗糙度测量显示在600 °C时有明显的最大值，随后在800 °C时部分平滑，这与快速合并后受 faceting 限制的生长一致。基于Δ⟨r²⟩的有效 Arrhenius 分析（其中⟨r²⟩=⟨A⟩/π）确定400-600 °C区间为主要粗化窗口。这些结果表明，PtNi/Zr 薄膜在蓝宝石和 langasite 上的热稳定性由合金迁移率、界面能量学和衬底依赖型形貌选择的耦合影响决定。
英文摘要
We examine the thermal evolution of 100-nm-thick Pt$_{0.9}$Ni$_{0.1}$ alloy films on sapphire and langasite substrates with a 10-nm Zr adhesion layer. Sequential vacuum annealing from room temperature to 800 $^\circ$C produces a substrate-dependent morphological pathway that is quantified by atomic force microscopy, image segmentation, height-distribution analysis, and effective coarsening metrics. Both types of films remain densely granular up to 400 $^\circ$C, undergo a sharp coarsening transition between 400 and 600 $^\circ$C, and evolve into coalesced faceted crystallites by 800 $^\circ$C. The mean projected feature area increases from $7.84 \times 10^2$ to $1.09 \times 10^5$ nm$^2$ on langasite and from $3.32 \times 10^2$ to $1.67 \times 10^5$ nm$^2$ on sapphire. Sapphire therefore develops the larger faceted crystallites, while langasite exhibits the larger roughness maximum at 600 $^\circ$C. Area distributions reveal that the 400-600 $^\circ$C transition does not uniformly shift the initial granular population but instead replaces it with a distinct large-feature ensemble. Height and roughness measurements show a pronounced maximum at 600 $^\circ$C, followed by partial smoothing at 800 $^\circ$C, consistent with rapid coalescence followed by faceting-limited growth. An effective Arrhenius analysis based on $Δ\langle r^2\rangle$, with $\langle r^2\rangle = \langle A\rangle/π$, identifies the 400-600 $^\circ$C interval as the dominant coarsening window. These results show that the thermal stability of PtNi/Zr films on sapphire and langasite is governed by the coupled influence of alloy mobility, interfacial energetics, and substrate-dependent morphological selection.
Comments8 pages, 5 figures in the main manuscript; 4 pages, 5 figures in the Supplemental Material
