Magnetic properties of Ca<SUB>2</SUB>F<SUB>2&#8722;x</SUB>Mn<SUB>x</SUB>O<SUB>5</SUB>

Magnetic susceptibility of Ca2F2&#8722;xMnxO5 members crystallizing in two different structures, one having octahedral (O), tetrahedral (T) and square-pyramidal (SP) coordination of transition metal atoms (OTSP structure) and the other having octahedral and tetrahedral coordination (OT structure), has been investigated. Susceptibility behaviour of the oxides with OTSP structure is different from that of the oxides with OT structure. Ca2Fe1&#183;33Mn0&#183;67O5 with OTSP structure shows an antiferromagnetic ordering while the corresponding oxide with OT structure shows weak ferromagnetism