Reaction of the elements yielded Ca₃Pt₄Bi₈ and CaPtBi, which are, to the best of our knowledge, the first reported ternary Ca–Pt–Bi compounds. The compounds crystallize isostructural to the Pd analogs Ca₃Pd₄Bi₈ (own structure type) and CaPdBi (TiNiSi structure type), respectively. Employing a multistep temperature treatment allows for the growth of mm-sized single crystals of Ca₃Pd₄Bi₈ and Ca₃Pt₄Bi₈ from a Bi self-flux. Their crystal structures can be visualized as consisting of a three-dimensional extended polyanion [M₄Bi₈]^6– (M = Pd, Pt), composed of interlinked M–Bi chains propagating along the c direction, and Ca²⁺ cations residing in one-dimensional channels between the chains. First-principles calculations reveal quasi-one-dimensional electronic behavior with reduced effective electron masses along [001]. Bader analysis points to a strong anionic character of the M species (M = Pd, Pt) in Ca₃M₄Bi₈. Thus, it is more appropriate to address the compounds Ca₃Pd₄Bi₈ and Ca₃Pt₄Bi₈ as a palladide and platinide, respectively. Magnetization measurements indicate diamagnetic behavior with no indications for superconductivity down to 2 K. Electrical resistivity data are consistent with metallic behavior and suggest predominant electron–phonon scattering.

中文翻译：

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三元金属间化合物 Ca3Pd4Bi8 和 Ca3Pt4Bi8 的助焊剂生长、晶体结构和电子性质

元素的反应产生 Ca ₃ Pt ₄ Bi ₈和 CaPtBi，据我们所知，它们是第一个报道的三元 Ca-Pt-Bi 化合物。这些化合物分别与 Pd 类似物 Ca ₃ Pd ₄ Bi ₈ (自身结构类型)和 CaPdBi (TiNiSi 结构类型)同构结晶。采用多步温度处理允许从 Bi 自熔剂中生长出毫米大小的 Ca ₃ Pd ₄ Bi ₈和 Ca ₃ Pt ₄ Bi ₈单晶。它们的晶体结构可以可视化为由三维扩展聚阴离子[M₄ Bi ₈ ] ^6– (M = Pd, Pt)，由沿c方向传播的相互连接的 M–Bi 链和位于链之间的一维通道中的Ca ^{2+阳离子组成。}第一性原理计算揭示了准一维电子行为，有效电子质量沿[001]减少。_{Bader 分析指出，Ca 3} M ₄ Bi ₈中的 M 物种 (M = Pd, Pt) 具有很强的阴离子特性。因此，更适合讨论化合物 Ca ₃ Pd ₄ Bi ₈和 Ca ₃ Pt ₄ Bi ₈分别作为钯和铂。磁化测量表明抗磁行为，没有迹象表明低至 2 K 的超导性。电阻率数据与金属行为一致，并表明电子 - 声子散射占主导地位。