2001/09/10 by Hiroshi Sawa, Emi Ninomiya, Tetsuo Ohama +7 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Polyoxometalates: Synthesis and Applications #Transition Metal Oxide Nanomaterials #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.71.385
published as J.Phys. Soc. Jpn. 71 (2002) 385-388 · 4 pages, 3 figures, 1 table
arxiv created 2001/09/10 · openalex publication_date 2002/02/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The low-temperature (LT) superstructure of α'-NaV2O5 was determined by synchrotron radiation x-ray diffraction. Below the phase transition temperature associated with atomic displacement and charge ordering at 34K, we observed the Bragg peak splittings, which evidence that the LT structure is monoclinic. It was determined that the LT structure is (a-b)× 2b × 4c with the space group A112 where a, b and c represent the high temperature orthorhombic unit cell. The valence estimation of V ions according to the bond valence sum method shows that the V sites are clearly separated into two groups of V4+ and V5+ with a zigzag charge ordering pattern. This LT structure is consistent with resonant x-ray and NMR measurements, and strikingly contrasts to the LT structure previously reported, which includes V4.5+ sites.