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In this paper,the synthesis of a novel polyoxovanadiumborate Cd0.75 Na2 Ni0.5 [V12 B18 O50.5(OH)9.5]·27.5 H2 O by hydrothermal method.The compound consists of metal M(Cd,Na,Ni)and V12 B18 O60 cluster units connected through the M-O bond to form a thr