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wettability while the addition of Ni decreases it. The wettability of the Ni containing Sn-based solder can be improved by addition of rare earth metal or other elements, e.g., Europium (Eu) (in a SnCuNi–Eu/Cu system) [ 22 ] or Indium (In) (in a SnCuNi

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, Starynowicz , P . Comparison of optical properties and crystal structures of the praseodymium and europium chloroderivatives of acetates . J Mol Struct . 2005 ; 740 : 237 – 248 . 10.1016/j.molstruc.2004.12.018 . 15

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asymmetric coordination environment of europium(III) ions [ 20 , 22 , 43 ]. Fig. 9 Photoluminescent spectrum of Eu 2 oba 3 ·5H 2 O The emission spectrum of the

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