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Transition from a phase segregated state to single-phase incommensurate sodium ordering in Na_xCoO_2 with x~0.53 | | R. Feyerherm
; E. Dudzik
; C. J. Milne
; S. Landsgesell
; D. Alber
; D. N. Argyriou
; A. U. B. Wolter
; | | Date: |
28 Apr 2010 | | Abstract: | Synchrotron X-ray diffraction investigations of two single crystals of
Na_xCoO_2 from different batches with composition x = 0.525-0.530 reveal
homogeneous incommensurate sodium ordering with propagation vector (0.53 0.53
0) at room-temperature. The incommensurate (qq0) superstructure exists between
220 K and 430 K. The value of q varies between q = 0.514 and 0.529, showing a
broad plateau at the latter value between 260 K and 360 K. We argue that the
commensurate-to-incommensurate transition is an intrinsic feature of samples
with Na concentrations x = 0.5 + d with d ~ 0.03. On cooling, unusual
reversible phase segregation into two volume fractions is observed. Below 220
K, one volume fraction shows the well-known commensurate orthorhombic x = 0.50
superstructure, while a second volume fraction with x = 0.55 exhibits another
commensurate superstructure with propagation vector (1/3 1/3 0). | | Source: | arXiv, 1004.4990 | | Services: | Forum | Review | PDF | Favorites | |
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