Eu₃Ir₂In₁₅: A mixed-valent and vacancy-filled variant of the Sc₅Co₄Si₁₀ structure type with anomalous magnetic properties

Journal Article · Tue Oct 27 00:00:00 EDT 2015 · Inorganic Chemistry

DOI:https://doi.org/10.1021/acs.inorgchem.5b01926· OSTI ID:1248022

Sarkar, Sumanta ^[1]; Jana, Rajkumar ^[1]; Siva, Ramesh ^[1]; Banerjee, Swastika ^[1]; Pati, Swapan K. ^[1]; Balasubramanian, Mahalingam ^[2]; Peter, Sebastian C. ^[1]

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1. Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India)
2. Argonne National Lab. (ANL), Argonne, IL (United States)

Here, a new compound, Eu₃Ir₂In₁₅ has been synthesized using indium as an active metal flux. The compound crystallizes in tetragonal P4/mbm space group with lattice parameters, a = 14.8580(4) Å, b = 14.8580(4) Å, c = 4.3901(2) Å. It was further characterized by SEM-EDX studies. The temperature dependent magnetic susceptibility suggests that Eu in this compound is exclusively in divalent state. The effective magnetic moment (μ_eff) of this compound is 7.35 μ_B/Eu ion with paramagnetic Curie temperature (θ_p) of -28 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 proposed that it is highly unlikely that a RE₅T₄X₁₀ would exist with X as a group 13 elements.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1248022
• Journal Information: Inorganic Chemistry, Vol. 54, Issue 22; ISSN 0020-1669
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
magnetism
metal flux technique
resistivity
crystallography
intermetallics