Relationship Between Magnetic Curie Points and Cell Sizes of Solid Solutions with the Ordered Perovskite Structure

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Abstract
A study of Ba2xSr2–2xFeMoO6 solid solutions with the ordered perovskite structure showed that their Curie points increased nonlinearly as the amount of strontium increased while their cell sizes decreased with greater quantities of strontium. By substituting calcium for strontium in Sr2FeMoO6 a decrease in Curie point was observed as the cell size continued to decrease. Presented is the data observed and a consideration of the possibility that a maximum superexchange interaction energy exists between iron and molybdenum in Sr2FeMoO6 at a Fe–O–Mo bond distance of approximately 3.95 Å.