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A new cobalt arsenate, Co 7 As 2 O 12 , has been synthesized under hydrothermal conditions. Its crystal structure has been determined by single crystal X-ray diffraction:  Imma  space group,  a  = 5.832(1) Å,  b  = 18.041(4) Å,  c  = 8.441(2) Å,  Z  = 4,  wR ( F  2 ) = 0.096 for 2176 independent reflections. Co 7 As 2 O 12  is isostructural with the spinelloid phase II and with the mineral manganostibite, Mn 7 SbAsO 12 . Its fully ordered cation distribution on the octahedral and tetrahedral sites of the oxygen cubic close-packing, (Co 5 As) [6] [(Co 2 As) [4] O 10 ]O 2 , has been rationalized in terms of a bond-valence analysis of the structure.

Co 7 AS 2 O 12 : a new cobalt arsenate with a spinelloid-type structure