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The variation of magnetic susceptibility and heat capacity with temperature for the bimetallic nickel Ni(II)–copper Cu(II) cyclo-tetrametaphosphates (CuNiP 4 O 12 ) has been examined. The complex has a structure of quasi-one-dimensional alternate spins chains of Ni(II) and Cu(II) that exhibits a three-dimensional magnetic ordering at approximately 13.5K. The compound is characterized...