We have investigated the crystal structure and magnetic properties of the new, series of ordered double perovskite oxides (Sr2-xCax)FeMoO6 (0 less than or equal to x less than or equal to1.0). A monotonous decrease of the lattice constants (a and c) has been found with increasing x. Such an effect may also give rise to a distorted structure with Fe-O-Mo angle changing from 180degrees for x = 0 to 162degrees for x = 1.0. The magnetization increases from x = 0 to 0.5 and then slightly decreases from x = 0.5 to 1.0. Such complex magnetic behavior is strongly correlated to the chemical size effect (corresponding to the internal pressure) in the title compounds. (C) 2002 Elsevier Science B.V. All rights reserved.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Volume: 239 Issue: 1-3 Special Issue: Sp. Iss. SI Pages: 164-166
