Abstract
The electric-quadrupole interactions at the Eu sites in Eu3V2O7 and Eu2VO4 oxides have been studied at room temperature with151Eu Mössbauer spectroscopy. Both divalent and trivalent Eu ions were found in the oxides. The fraction of Eu2+ is 17.1(8)% in Eu3V2O7 and 39.0(1.6) % in Eu2VO4. The values of the quadrupole coupling constant, eVzzQg, obtained from the fits using a full Hamiltonian method are −6.594(50) and −8.043(65) mm/s for Eu3+, and −13.168(402) and −18.032(134) mm/s for Eu2+, respectively in Eu3V2O7 and Eu2VO4. The magnitude of eVzzQg in Eu2VO4 is the largest ever reported for Eu2+ in any Eu oxide system.
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Stadnik, Z.M., Stroink, G. & Arakawa, T. Quadrupole interactions at europium sites in Eu3V2O7 and Eu2VO4 . Hyperfine Interact 68, 209–212 (1992). https://doi.org/10.1007/BF02396473
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DOI: https://doi.org/10.1007/BF02396473