Crystals of the new ternary bismuthides AE₅Ti₁₂Bi_19+x (AE = Sr, Ba) and Sr_5–δEu_δTi₁₂Bi_19+x (δ ≈ 2.4, 4.0; x ≤ 1.0) were grown using an excess of molten Bi as a flux. The title compounds crystallize in the cubic non‐centrosymmetric space group P43m and are structurally related to the antimonides Ba₅M₁₂Sb_19+x (M = Ti, V, Nb). The crystal structure features Ti atoms stuffed in the γ‐brass‐like sub‐lattice made of AE (AE = Sr, Ba, Eu) and Bi atoms. The arrangement of the AE atoms, on its own, represents a framework consisting of interconnected regular tetrahedra and octahedra. Another notable attribute of the AE₅Ti₁₂Bi_19+x structure is the disordered Bi moiety located at the center of the unit cell and showing homoatomic Bi–Bi bonding. Electronic structure calculations and electrical resistivity measurements indicate metallic behavior of the new bismuthides. Magnetization measurements on samples of Sr_5–δEu_δTi₁₂Bi_19+x show paramagnetic behavior consistent with the 2+ ground state for Eu. The measurements also confirm no magnetic ordering down to 3 K, stemming from the geometrically frustrated exchange interactions of the Eu²⁺ cations.

中文翻译：

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钛铋化物Sr5Ti12Bi19 + x，Ba5Ti12Bi19 + x和Sr5-δEuδTi12Bi19+ x的合成，晶体和电子结构（x≈0.5–1.0；δ≈2.4、4.0）

新的三元铋化的晶体AE ₅的Ti ₁₂毕_{19+ X}（AE =锶，钡）和Sr _{5- δ} Eu的_δ的Ti ₁₂毕_{19+ X}（δ听，说：2.4，4.0; X ≤1.0）是用过量的生长熔融的铋作为助熔剂。标题化合物在立方非中心对称空间群P 4 3 m中结晶，并与锑化物Ba ₅ M ₁₂ Sb _{19+ x}（M= Ti，V，Nb）。晶体结构具有填充在由AE（AE = Sr，Ba，Eu）和Bi原子构成的γ黄铜状亚晶格中的Ti原子。AE原子的排列本身代表由相互连接的规则四面体和八面体组成的框架。AE ₅ Ti ₁₂ Bi _{19+ x}结构的另一个显着属性是位于晶胞中心的无序Bi部分，显示出同原子的Bi-Bi键。电子结构计算和电阻率测量表明了新型铋的金属性能。上的锶样品磁化，测量_{5- δ}铕_δTi ₁₂ Bi _{19+ x}显示出与Eu的2+基态一致的顺磁行为。这些测量结果还证实，由于Eu ²⁺阳离子的几何受阻交换相互作用，在低至3 K时无磁序。