Elucidating elusive quaternary selenide EuCeCuSe3: Synthesis, crystal structure, properties and theoretical studies

Elucidating a Series of the Quaternary Selenides BaRECuSe3 with a Rich Library of Optical Properties

“…In general, in the series of BaRECuSe 3 , the presence of two space groups Pnma and Cmcm and three structural types BaLaCuS 3 , Eu 2 CuS 3 and KZrCuS 3 was experimentally confirmed (Figure ), which is consistent with the results of a series of isostructural selenides SrRECuSe 3 and EuRECuSe 3 . , Interestingly, a notable structural behavior was previously revealed for the BaLaCuSe 3 and BaCeCuSe 3 derivatives, which crystallized in the BaLaCuS 3 and Eu 2 CuS 3 structure types, respectively (Figure ). ,, The Ba 2+ cation in the structures of both selenides as well as the La 3+ cation in the structure of the former selenide adopts a monocapped trigonal prismatic coordination environment Se 7 , while the Ce 3+ cation is in an octahedral coordination environment Se 6 in the structure of the latter selenide.…”

“…For BaRECuSe 3 , as mentioned above, the change of a space group is observed on the Ce/Nd boundary (Figure ). Thus, an increase in the radius of the M 2+ cation or the radius of the chalcogenide anion Ch 2– , while keeping the rest of the composition unchanged, leads to an earlier formation of a symmetric structure ( Cmcm symmetry) in MRECuCh 3 (M = Eu, Sr and Ba; Ch = S, Se and Te). ,− ,− ,− …”

“…Top: A structure field map of BaRECuCh 3 (Ch = S, circle [refs , , , and ]; Se = square [refs , , and − and this work]; Te = triangle [refs , , , , and ]). Bottom: A structure field map of MRECuSe 3 (M = Eu, circle [refs and ]; Sr = square [refs , , and ]; Ba = triangle [refs , , and − and this work]). Color code: BaLaCuS 3 structure type = blue, Ba 2 MnS 3 structure type = green, Eu 2 CuS 3 structure type = red and KZrCuS 3 structure type = black.…”

Synthesis, structures and magnetic properties of the Eu-based quaternary tellurides EuGdCuTe3and EuLuCuTe3

“…20) with the other lanthanides. However, it took a decade to obtain selenides of the same type EuRECuSe 3 , [21][22][23][24] while similar tellurides EuRECuTe 3 , to the best of our knowledge, have not been reported so far. In EuRECuCh 3 (Ch = S, Se), the coordination of Cu is always tetrahedral, europium forms either a mono-or bicapped trigonal prism or trigonal prism, and RE forms either a monocapped trigonal prism or octahedron.…”

“…23 In general, comprehensive studies of magnetic properties of the quaternary chalcogenides EuRECuCh 3 (Ch = S, Se) revealed that if μ theor (RE 3+ ) ≪ μ theor (Eu 2+ ) then the chalcogenide is ferromagnetic, while if μ theor (RE 3+ ) ≥ μ theor (Eu 2+ ) then the chalcogenide exhibits ferrimagnetic properties. [18][19][20][22][23][24]37 In the telluride EuGdCuTe 3 , the magnetic moments of the Gd 3+ and Eu 2+ cations are equal, suggesting a ferrimagnetic transition in this compound, while in the telluride EuLuCuTe 3 μ theor (Lu 3+ ) = 0 μ B , indicating a possible ferromagnetic transition.…”