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• W2621765720 abstract "Abstract Polycrystalline samples of Sr 0.95 Eu 0.05 Ba 8 [BN 2 ] 6 and Eu 0.937 Ba 8 [BN 2 ] 6 were synthesized via conventional solid-state reaction from the binary precursor compounds Sr 3 N 2 , EuN, Ba 3 N 2 and BN at 1000 °C. The structure of Eu 0.937 Ba 8 [BN 2 ] 6 was refined from single crystal X-ray diffractometer data: Eu 0.937 Ba 8 [BN 2 ] 6 type, Fd 3 ¯ m, a  = 1594.54(9) pm, w R 2 = 0.0654, 380 F 2 values and 23 variables. The 8 a europium site shows an occupancy of only 93.7(9) % suggesting partial oxidation of europium to fulfil an electron-precise description, i. e. Eu II 0.81 Eu III 0.13 Ba 8 [BN 2 ] 6 . The mixed europium valence was confirmed by magnetic susceptibility measurements (reduced magnetic moment of 7.28 μ B per europium atom) and 151 Eu Mossbauer spectroscopy (Eu II : Eu III  = 82: 18). The nitridoborate anions are coordinated by slightly distorted, mono-capped (europium) square prisms formed by the barium atoms. All metal cations are hexa-coordinated by nitrogen atoms. The EPR spectra of Eu x Sr 1-x Ba 8 [BN 2 ] 6 samples (0.001 ≤ x ≤ 0.01) suggest close to cubic local symmetry of the Eu 2+ dopant ions and reveal some highly unusual features: Magnetic hyperfine splitting is only observed with one of the Eu nuclear isotopes, and the coupling constant of 243.6 MHz is extremely large compared to values (90–100 MHz) typically observed in the literature for Eu 2+ doped crystalline materials." @default.
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• W2621765720 date "2017-08-01" @default.
• W2621765720 modified "2023-09-24" @default.
• W2621765720 title "Mixed europium valence in Eu0.937Ba8[BN2]6 – Structure and spectroscopic behavior" @default.
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• W2621765720 doi "https://doi.org/10.1016/j.solidstatesciences.2017.06.002" @default.
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