Metal Flux Growth, Structural Relations, and Physical Properties of EuCu2Ge2 and Eu3T2In9 (T = Cu and Ag)

Subbarao, Udumula; Roy, Soumyabrata; Sarma, Saurav Ch.; Sarkar, Sumanta; Mishra, Vidyanshu; Khulbe, Yatish; Peter, Sebastian C.

doi:10.1021/acs.inorgchem.6b01598

Title: Metal Flux Growth, Structural Relations, and Physical Properties of EuCu₂Ge₂ and Eu₃T₂In₉ (T = Cu and Ag)

Journal Article · Tue Sep 27 00:00:00 EDT 2016 · Inorganic Chemistry

DOI:https://doi.org/10.1021/acs.inorgchem.6b01598· OSTI ID:1332569

Subbarao, Udumula ^[1]; Roy, Soumyabrata ^[1]; Sarma, Saurav Ch. ^[1]; Sarkar, Sumanta ^[2]; Mishra, Vidyanshu ^[1]; Khulbe, Yatish ^[1]; Peter, Sebastian C. ^[1]

Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India)
Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India)dia

Single crystals (SCs) of the compounds Eu₃Ag₂In₉ and EuCu₂Ge₂ were synthesized through the reactions run in liquid indium. Eu₃Ag₂In₉ crystallizes in the La₃Al₁₁ structure type [orthorhombic space group (SG) Immm] with the lattice parameters: a = 4.8370(1) Å, b = 10.6078(3) Å, and c = 13.9195(4) Å. EuCu₂Ge₂ crystallizes in the tetragonal ThCr₂Si₂ structure type (SG I4/mmm) with the lattice parameters: a = b = 4.2218(1) Å, and c = 10.3394(5) Å. The crystal structure of Eu₃Ag₂In₉ is comprised of edge-shared hexagonal rings consisting of indium. The one-dimensional chains of In6 rings are shared through the edges, which are further interconnected with other six-membered rings forming a three-dimensional (3D) stable crystal structure along the bc plane. The crystal structure of EuCu₂Ge₂ can be explained as the complex [CuGe]^(2+δ)– polyanionic network embedded with Eu ions. These polyanionic networks present in the crystal structure of EuCu₂Ge₂ are shared through the edges of the 011 plane containing Cu and Ge atoms, resulting in a 3D network. The structural relationship between Eu₃T₂In₉ and EuCu₂Ge₂ has been discussed in detail, and we conclude that Eu₃T₂In₉ is the metal deficient variant of EuCu₂Ge₂. The magnetic susceptibilities of Eu₃T₂In₉ (T = Cu and Ag) and EuCu₂Ge₂ were measured between 2 and 300 K. In all cases, magnetic susceptibility data followed Curie–Weiss law above 150 K. Magnetic moment values obtained from the measurements indicate the probable mixed/intermediate valent behavior of the europium atoms, which was further confirmed by X-ray absorption studies and bond distances around the Eu atoms. As a result, electrical resistivity measurements suggest that Eu₃T₂In₉ and EuCu₂Ge₂ are metallic in nature.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: DST

Grant/Contract Number:: SR/S2/RJN-24/2010; SR/NM/Z-07/2015

OSTI ID:: 1332569

Journal Information:: Inorganic Chemistry, Vol. 55, Issue 20; ISSN 0020-1669

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 3 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
europium
metals
fluxes
indium
crystal structure

Title: Metal Flux Growth, Structural Relations, and Physical Properties of EuCu2Ge2 and Eu3T2In9 (T = Cu and Ag)

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Title: Metal Flux Growth, Structural Relations, and Physical Properties of EuCu₂Ge₂ and Eu₃T₂In₉ (T = Cu and Ag)