Structure and Magnetism inAB10O15+x(A= Sr, Ba;B= V, Cr;x= 0, ∼1): Evidence for Geometric Frustration

Some members of the seriesAB10O15+x,A= Sr, Ba,B= V, Cr,x= 0 and ∼1, have been studied and are found to possess unusual magnetic properties which can be traced to geometric frustration of theB-site magnetic sublattice. These compounds crystallize inCmcaand the structure can be described as a hexagonal close packing of alternatingAO7and O8layers with theBions occupying 5/8 of the octahedral sites. The presence ofA2+ions in the close …