Eu3Ir2In15: A Mixed-Valent and Vacancy-Filled Variant of the Sc5Co4Si10 Structure Type with Anomalous Magnetic Properties

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• 作者：Sumanta Sarkar ; Swastika Banerjee ; Rajkumar Jana ; Ramesh Siva ; Swapan K. Pati ; Mahalingam Balasubramanian ; Sebastian C. Peter
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：November 16, 2015
• 年：2015
• 卷：54
• 期：22
• 页码：10855-10864
• 全文大小：688K
• ISSN：1520-510X

文摘

A new compound, Eu₃Ir₂In₁₅, has been synthesized using indium as an active metal flux. The compound crystallizes in the tetragonal P4/mbm space group with lattice parameters a = 14.8580(4) 脜, b = 14.8580(4) 脜, and c = 4.3901(2) 脜. It was further characterized by SEM-EDX studies. The effective magnetic moment (渭_eff) of this compound is 7.35 渭_B/Eu ion with a paramagnetic Curie temperature (胃_p) of 鈭?8 K, suggesting antiferromagnetic interaction. The mixed-valent nature of Eu observed in magnetic measurements was confirmed by XANES measurements. The compound undergoes demagnetization at a low magnetic field (10 Oe), which is quite unusual for Eu-based intermetallic compounds. Temperature-dependent resistivity studies reveal that the compound is metallic in nature. A comparative study was made between Eu₃Ir₂In₁₅ and hypothetical vacancy-variant Eu₅Ir₄In₁₀, which also crystallizes in the same crystal structure. However, our computational studies along with control experiments suggest that the latter is thermodynamically less feasible compared to the former, and hence we propose that it is highly unlikely that an RE₅T₄X₁₀ would exist with X as a group 13 element.