Effect of preparation procedure on the magnetic and transport properties of double perovskite Sr2FeMoO6
Wang Jin-Hui (王锦辉)a, Yu Zhi (余智)b, Liu Gong-Qiang (刘公强)ac, Du You-Wei (都有为)d
a Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China; b Department of Chemistry, Nanjing University, Nanjing 210093, China; c Chinese Centre of Advanced Science and Technology (CCAST) (World Laboratory), Beijing 100080, China; d Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China;
Abstract Ordered and disordered double perovskite Sr$_2$FeMoO$_6$ ceramics have been investigated by powder x-ray diffraction, magnetic and transport measurements, as well as M?ssbauer spectroscopy. The heavily disordered sample can be acquired by annealing the ordered samples in argon. The annealing procedure affects not only the nature of grain boundaries but also the grain itself. The evidence of M?ssbauer spectra performed at 77 and 300 K indicates that there exist small oxygen deficient clusters of SrFeO$_{3-y}$ in the disordered sample. The paramagnetic Fe$^{4+}$ and Fe$^{3+}$ ions in the compound subsist down to 77 K and the ratio of Fe$^{4+}$/Fe$^{3+}$ increases with decreasing temperature.
Received: 10 February 2003
Revised: 21 July 2003
Accepted manuscript online:
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No 1999064508).
Cite this article:
Wang Jin-Hui (王锦辉), Yu Zhi (余智), Liu Gong-Qiang (刘公强), Du You-Wei (都有为) Effect of preparation procedure on the magnetic and transport properties of double perovskite Sr2FeMoO6 2004 Chinese Physics 13 90
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