Rare-earth compounds ( stands for a transition d-metal and is a p-metal) form a large family of intermetallics, revealing a variety of intriguing physical properties. Among them, Ce compounds represent a particularly studied group, due to their frequently complex magnetic structures, Kondo physics, pressure-induced superconductivity, or recently highlighted quantum quasi-bound states. We report on the structural properties and their systematics within the CeCuAl-related intermetallics crystallising in the tetragonal structure of the BaNiSn-type. Our synchrotron X-ray diffraction data of 14 selected alloys allow us to follow the evolution of crystallographic parameters of the CeCuAl-based substitution series. Substitutions of , and elements are shown to have significant impact on the unit cell volume, virtual lattice expansion and free fraction coordinates of individual Wyckoff sites. Structural parameters are discussed within the framework of physical properties of investigated compounds.

中文翻译：

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CeCuAl3 相关金属间化合物家族中的晶体学参数及其系统学

稀土化合物（代表过渡 d 金属，是 p 金属）形成一大类金属间化合物，揭示了各种有趣的物理性质。其中，Ce 化合物因其经常复杂的磁性结构、近藤物理学、压力诱导超导性或最近突出的量子准束缚态而代表了一个特别研究的群体。我们报告了在 BaNiSn 型四方结构中结晶的 CeCuAl 相关金属间化合物的结构特性及其系统学。我们的 14 种选定合金的同步加速器 X 射线衍射数据使我们能够跟踪基于 CeCuAl 的替代系列的晶体学参数的演变。 、 和 元素的取代对单个威科夫位点的晶胞体积、虚拟晶格膨胀和自由分数坐标有显着影响。在所研究的化合物的物理性质的框架内讨论结构参数。