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Five compounds were investigated for magnetic character andsuperconductivity, all with non-magnetic nickel and band structures containingflat bands and steep bands. The syntheses and crystal structures, refined bypowder X-ray diffraction, are reported for M6Ni16Si7, where M = Mg, Sc, Ti, Nb,and Ta. All compounds form in the Mg6Cu16Si7 structure type. Resistancemeasurements are also reported on M6Ni16Si7 (M = Mg, Sc, Ti, and Nb) down to0.3 K, with all four showing metallic conductivity. No superconductivity isobserved. Magnetization measurements for all compounds reveal essentiallytemperature independent paramagnetism, with a tendency toward more enhanced lowtemperature paramagnetism for the cases of Mg6Ni16Si7 and Sc6Ni16Si7.

Crystal Structure and Physical Properties of Mg6Cu16Si7-type M6Ni16Si7, for M = Mg, Sc, Ti, Nb, and Ta