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• W2043201701 abstract "Abstract Phosphates of general formula M 0.5 Hf 2 (PO 4 ) 3 with M=Cd 2+ , Ca 2+ , Sr 2+ and Cu 2+ were prepared by coprecipitation and characterized by several physical techniques. The compounds containing Cd 2+ , Ca 2+ , Sr 2+ belong to the Nasicon-type structure, whereas Cu 0.5 Hf 2 (PO 4 ) 3 exhibited substantially different DRX patterns. Combined temperature programmed reduction (TPR) and temperature-programmed oxidation (TPO) showed that the copper in Cu 0.5 Hf 2 (PO 4 ) 3 was distributed between two energetically different sites in proportions respectively equal to 40 and 60%. Electron Paramagnetic Resonance (EPR) investigations confirmed the TPR/TPO results and revealed that the two sites hosting the Cu 2+ ions are of orthorhombic symmetry. Moreover, the Cu 2+ ions might be reduced by hydrogen to Cu + . These results were also supported by the UV–visible studies that showed the disappearance, under reducing conditions, of the band corresponding to crystal field transitions of Cu 2+ ions and the emergence of a new peak attributed to the transitions between (3d) 10 and (3d) 9 (4s) 1 Cu + levels. At the same time, IR spectroscopy confirmed that protons entered the open lattice framework of the material and gave rise to a new protonated phase containing monovalent copper Cu 0.5 I H 0.5 Hf 2 (PO 4 ) 3 . This redox process was proven to be reversible without any subsequent change in the network of the phosphate." @default.
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• W2043201701 date "1998-07-02" @default.
• W2043201701 modified "2023-09-27" @default.
• W2043201701 title "Synthesis and properties of a new copper(II)-hafnium phosphate Cu0.5Hf2(PO4)3" @default.
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• W2043201701 doi "https://doi.org/10.1016/s0167-2738(98)00139-8" @default.
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