T S Chan et al 2009 J. Phys.: Conf. Ser. 190 012095 doi:10.1088/1742-6596/190/1/012095
EXAFS study of double perovskite (Sr2-xCax)FeMoO6 (0 ≤ x ≤ 2.0) and Sr2CrMO6 (M = Mo, W) systems
T S Chan1, J-F Lee1 and R S Liu2
Show affiliationsThe local structure of the double perovskite (Sr2-xCax)FeMoO6 (0 ≤ x ≤ 2.0) and Sr2CrMO6 (M = Mo, W) systems have been probed by extended X-ray absorption fine structure (EXAFS) spectroscopy at the Fe and Cr K-edges. It was found that the Fe-O distance decreases from 1.999(7) Å (x = 0) to 1.991(1) Å (x = 1.0) in (Sr2-xCax)FeMoO6 with a tetragonal phase (I4/m). When the x value is further increased from 1.5 to 2.0, the Fe-O bond distance decreases from 2.034(5) to 2.012(4) Å with a monoclinic phase (P21/n). On the other hand, Cr-O, Cr-Sr and Cr-W bond distances in Sr2CrWO6 are all slightly longer than the corresponding bond distances in Sr2CrMoO6, which is attributable to the larger ionic radius of W5+ (0.62 Å) than Mo5+ (0.61 Å).
- PACS
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61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
75.50.Dd Nonmetallic ferromagnetic materials
61.50.Lt Crystal binding; cohesive energy
78.70.Dm X-ray absorption spectra
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
- Subjects
- Dates
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Issue 1 (2009)
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EXAFS study of double perovskite (Sr2-xCax)FeMoO6 (0 ≤ x ≤ 2.0) and Sr2CrMO6 (M = Mo, W) systems
T S Chan et al 2009 J. Phys.: Conf. Ser. 190 012095
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