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Title: Eu 3Ir 2In 15: A mixed-valent and vacancy-filled variant of the Sc 5Co 4Si 10 structure type with anomalous magnetic properties

Here, a new compound, Eu 3Ir 2In 15 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 Eu 3Ir 2In 15 and hypothetical vacancy variant Eu 5Ir 4In 10 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 RE 5T 4X 10 would existmore » with X as a group 13 elements.« less
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  1. Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 54; Journal Issue: 22; Journal ID: ISSN 0020-1669
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; magnetism; metal flux technique; resistivity; crystallography; intermetallics
OSTI Identifier: