发表机构
The University of Tennessee, Knoxville; Laser Thermal; The University of Virginia; Center for Nanophase Materials, Oak Ridge National Laboratory; National Synchrotron Light Source II, Brookhaven National Laboratory; National Institute of Standards and Technology（田纳西大学诺克斯维尔分校; 激光热技术公司; 弗吉尼亚大学; 橡树岭国家实验室纳米材料中心; 布鲁克海文国家实验室第二代同步辐射光源; 美国国家标准与技术研究院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究建立高通量组合薄膜合成与多模态表征工作流程，制备(GdDyHoEr)₂Zr₂O₇薄膜组合库，发现富Dy/Gd象限热导率最小值对应最大晶格参数，明确适配成分复杂性是热输运的关键描述符。
AI 中文摘要
为加速下一代热障材料的发现，亟需对具有优异热机械性能和相稳定性的新型陶瓷材料进行高通量合成与表征。本研究采用稀土/锆合金靶材，通过组合磁控反应溅射法制备了(GdDyHoEr)₂Zr₂O₇组合薄膜材料库，对四组分成分空间开展了结构、化学及热性能表征映射，并与热输运测量结果关联。稳态热反射映射显示，在富Dy/Gd象限存在显著的热导率最小值，该最小值既不与等原子组成重合，也不与预测的阳离子尺寸无序度最大的区域重合；相反，它对应于实验观测到的最大晶格参数，尽管偏离了维加德型化学平均规律，且与晶粒尺寸和全谱微应变无关。这些观测结果表明，萤石晶格适配成分复杂性的方式，而非仅阳离子尺寸无序度，是热输运更具参考性的描述符。总体而言，本研究建立了组合薄膜合成与多模态表征的高通量工作流程，可快速识别成分复杂陶瓷中此前难以获取的结构-性能关系。
英文摘要
High-throughput synthesis and characterization of novel ceramic materials with improved thermomechanical properties and phase stability are needed to accelerate the discovery of next-generation thermal barrier materials. A combinatorial thin film material library of (GdDyHoEr)2Zr2O7 were created via combinatorial magnetron reactive sputtering with rare-earth/zirconium alloy targets. Structural, chemical, and thermal property characterization mapping across the four component composition space was performed and correlated with thermal transport measurements. Steady state thermoreflectance mapping identifies a pronounced minimum in thermal conductivity within the Dy/Gd-rich quadrant. This minimum does not coincide with either the equiatomic composition or the region predicted to exhibit maximum cation size disorder. Instead, it corresponds to the largest experimentally observed lattice parameter, despite deviating from Vegard-like chemical averaging, and is independent of grain size and whole-pattern microstrain. These observations suggest that the way the fluorite lattice accommodates compositional complexity, rather than cation size disorder alone, provides a more informative descriptor of thermal transport. Overall, this work establishes a high-throughput workflow for combinatorial thin-film synthesis and multimodal characterization, enabling the rapid identification of previously inaccessible structure-property relationships in compositionally complex ceramics.
