Abstract
The study of the phase composition of the SrCo2(VO4)2 – SrCo2(PO4)2 system showed that it belongs to pseudo binary equilibria. The new phosphate-vanadates Sr2.4-xCo2.6+xP3VO15, x = 0–0.04, was found to crystallize in the Sr2.36Mg2.64P4O15 structural type. The crystal structure of the Sr2.4-хCo2.6+xP3VO15 (x = 0.00, 0.02 and 0.04) consists of three types of tetrahedra, Co(1)O4, P/V(1)O4 and P(2)O4, one octahedron, Sr/Co(2)O6, and ten-fold oxygen coordination around Sr(1) ions. There are two types of chains directed along c-axis, consisting of edge-sharing octahedra, Sr/Co(2)O6, and corner-sharing tetrahedra, Co(1)O4, respectively. These chains are connected through P/V(1)O4, that form P/V(1)2O7 pyro-groups, and single P(2)O4 groups. Magnetic susceptibility of Sr2.4-хCo2.6+xP3VO15 (x = 0.00, 0.02, 0.04) measured in the temperature range from 2 to 300 K is found to be determined by linear chains of tetrahedrally surrounded cobalt and by paramagnetic octahedral cobalt ions.
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