Abstract
New perovskite oxides of the formula A 2FeMn 0.5W 0.5O 6 (A = Ca, Sr and Ba) have been prepared and their structure, magnetic, dielectric properties have been investigated. Ca 2FeMn 0.5W 0.5O 6 and Sr 2FeMn 0.5W 0.5O 6 compounds crystallize in cubic double perovskite structure (space group Fm-3 m) whereas Ba 2FeMn 0.5W 0.5O 6 adopts the hexagonal 6H-type perovskite structure (space group P6 3/ mmc). Magnetic measurements indicate that compositions are weakly ferromagnetic with dominating antiferromagnetic interactions at low temperatures. The dielectric behavior of A 2FeMn 0.5W 0.5O 6 (A = Ca, Sr and Ba) compounds is similar to that of relaxor ferroelectrics exhibiting the frequency dependence with a broad maxima around 350 K. Under 1 T applied magnetic field, the Ca and Sr members show a change in dielectric behavior indicating coupling between their magnetic and dielectric properties, while the Ba member did not show such effect. Further, on introducing oxygen vacancies ( δ ∼ 0.28), the Ba compound undergoes a structural transformation from hexagonal to cubic and this transformation is reversible. The oxygen deficient member Ba 2FeMn 0.5W 0.5O 5.72 exhibits a significant enhancement in its magnetic behavior compared to that of the oxygen stoichiometric parent composition, Ba 2FeMn 0.5W 0.5O 6.
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