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The itinerant electron density ( n ) near the Fermi level has a close correlation with the physical properties of Sr 2 FeMoO 6 . Two series of single-phase Sr (2- y ) Na  y  FeMoO 6 ( y = 0.1, 0.2, 0.3) and Sr (2- y ) Na  y  Fe (1- x ) Mo (1+ x ) O 6 ( y = 2 x ; y = 0.1, 0.2, 0.3) ceramics were specially designed and the itinerant electron density ( n ) of them can be artificially controlled to be: n = 1 - y and n = 1 - y + 3 x = 1 + 0.5 y , respectively. The corresponding crystal structure, magnetization and the ferromagnetic Curie temperature ( T  C ) of two subjects were investigated systematically. The X-ray diffraction analysis indicates that Sr (2- y ) Na  y  FeMoO 6 ( y = 0.1, 0.2, 0.3) have comparable Fe/Mo anti-site defect (ASD) content in spite of decreased n . However, a drastically improved Fe/Mo ASD can be observed in Sr (2- y ) Na  y  Fe (1- x ) Mo (1+ x ) O 6 ( y = 2 x ; y = 0.1, 0.2, 0.3) caused by the intrinsic wrong occupation of normal Fe sites with excess Mo. Magnetization-magnetic field ( M - H ) behavior confirms that it is the Fe/Mo ASD not n that dominantly determines the magnetization properties. Interestingly, approximately when n ≤ 0.9, T  C of Sr (2- y ) Na  y  FeMoO 6 ( y = 0.1, 0.2, 0.3) exhibits an overall increase with decreasing n , which is contrary to the T  C response in electron-doped SFMO. Such abnormal T  C is supposed to relate with the ratio variation of n (Mo)/ n (Fe). Moreover, when n ≥ 1, T  C of Sr (2- y ) Na  y  Fe (1- x ) Mo (1+ x ) O 6 ( y = 2 x ; y = 0.3) exhibits a considerable rise of about 75 K over that of Sr (2- y ) Na  y  Fe (1- x ) Mo (1+ x ) O 6 ( y = 2 x ; y = 0.1), resulting from improved n caused by introducing excess Mo into Sr (2- y ) Na  y  FeMoO 6 . Maybe, our work can provide an effective strategy to artificially control n and ferromagnetic T  C accordingly, and provoke further investigation on the FeMo-baseddouble perovskites.

Effect of the itinerant electron density on the magnetization and Curie temperature of Sr2FeMoO6 ceramics

Effect of the itinerant electron density on the magnetization and Curie temperature of Sr₂FeMoO₆ ceramics