Fe and Cr K‐edges EXAFS Study of Double Perovskite (Sr 2 ‐ x Ca x )FeMoO 6  (0 ≤ x ≤ 2.0) and Sr 2 CrMO 6  (M = Mo, W) Systems | Zendy

Chan T. S. | Zendy; Liu R.S. | Zendy; Jang L.Y. | Zendy

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Fe and Cr K‐edges EXAFS Study of Double Perovskite (Sr 2 ‐ x Ca x )FeMoO 6 (0 ≤ x ≤ 2.0) and Sr 2 CrMO 6 (M = Mo, W) Systems

Author(s) -

Chan T. S.,

Liu R.S.,

Jang L.Y.

Publication year - 2005

Publication title -

journal of the chinese chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.329

H-Index - 45

eISSN - 2192-6549

pISSN - 0009-4536

DOI - 10.1002/jccs.200500101

Subject(s) - ionic radius , chemistry , extended x ray absorption fine structure , monoclinic crystal system , bond length , tetragonal crystal system , crystallography , ionic bonding , perovskite (structure) , crystal structure , spectroscopy , analytical chemistry (journal) , absorption spectroscopy , ion , physics , organic chemistry , chromatography , quantum mechanics

The local structure of the double perovskite (Sr 2‐x Ca x )FeMoO 6 (0 ≤ × ≤ 2.0) and Sr 2 CrMO 6 (M = Mo, W) systems have been probed by extended X‐ray absorption fine structure (EXAFS) spectroscopy at the Fe and Cr K ‐edges. We found Fe‐O (ave) distance apparently decreases from 1.999 Å (x = 0) to 1.991 Å (x = 1.0) in (Sr 2‐x Ca x )FeMoO 6 (tetragonal structure). When x is increased further from 1.5 to 2.0, the Fe‐O bond distance decreased from 2.034 Å to 2.012 Å (monoclinic structure). In addition, Cr‐O, Sr‐Cr, and Cr‐Mo bond distances in Sr 2 CrWO 6 are all slightly larger than the bond distances of Sr 2 CrMoO 6 , which is due to the ionic radius of the W 5+ (0.62 Å) which is larger than the ionic radius of Mo 5+ (0.61 Å). The results are consistent with our XRD refinements data.

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