中国物理B ›› 2004, Vol. 13 ›› Issue (1): 90-94.doi: 10.1088/1009-1963/13/1/017

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Effect of preparation procedure on the magnetic and transport properties of double perovskite Sr2FeMoO6

余智1, 都有为2, 王锦辉3, 刘公强4   

  1. (1)Department of Chemistry, Nanjing University, Nanjing 210093, China; (2)Department of Physics, Nanjing University, Nanjing 210093, China; (3)Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China; (4)Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China; Chinese Centre of Advanced Science and Technology (CCAST) (World Laboratory), Beijing 100080, China
  • 收稿日期:2003-02-10 修回日期:2003-07-21 出版日期:2004-01-22 发布日期:2007-03-22
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No 1999064508).

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   

  1. 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; 
  • Received:2003-02-10 Revised:2003-07-21 Online:2004-01-22 Published:2007-03-22
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No 1999064508).

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摘要： Ordered and disordered double perovskite Sr_2FeMoO_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.

关键词: double perovskite, magnetoresistance, M?ssbauer spectra

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.

Key words: double perovskite, magnetoresistance, M?ssbauer spectra

中图分类号:  (M?ssbauer effect; other γ-ray spectroscopy)

  • 76.80.+y
81.40.Ef (Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization) 75.47.Pq (Other materials) 61.43.-j (Disordered solids) 61.66.Fn (Inorganic compounds)