Abstract
The ternary compounds Mg2.5Ni11.5P7, Ca2.1Ni11.9P7 and Ca2.3Ni11.7As7 were structurally characterized. They are isotypic and crystallize in the Zr2Fe12P7-type (space group P6̅) with the following constants: Mg2.5NI11.5P7, a = 907,9(1) pm, c = 355,7(1) pm, Ca2.1Ni11.9P7, a = 910.3(1) pm, c = 367.6(1) pm, Ca2.3NI11.7AS7, a = 940.4(1) p m , c = 381.6(1) pm.

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