Sodium ion ordering in NaxCoO2: Electron diffraction study

H. W. Zandbergen; M. Foo; Q. Xu; V. Kumar; R. J. Cava

doi:10.1103/PhysRevB.70.024101

Sodium ion ordering in Na_xCoO₂: Electron diffraction study

H. W. Zandbergen, M. Foo, Q. Xu, V. Kumar, R. J. Cava

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Abstract

The layered sodium cobalt oxide Na_xCoO₂ is studied by electron diffraction for a wide range of sodium contents, 0.15<x<0.75. An extensive series of ordered Na ion-Na vacancy superlattices is found beyond the simple hexagonal average structure. The most strongly developed superlattice is found for the composition Na_0.5CoO₂, which displays Co³⁺/Co⁴⁺ charge ordering at low temperatures. The structural principle for some of the observed ordering schemes, particularly, near x=0.5, is, surprisingly, the presence of lines of Na ions and vacancies rather than simply maximized Na-Na separations.

Original language	English (US)
Article number	024101
Pages (from-to)	024101-1-024101-8
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.70.024101
State	Published - Jul 2004

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Sodium ion ordering in NaxCoO2: Electron diffraction study",

abstract = "The layered sodium cobalt oxide NaxCoO2 is studied by electron diffraction for a wide range of sodium contents, 0.150.5CoO2, which displays Co3+/Co4+ charge ordering at low temperatures. The structural principle for some of the observed ordering schemes, particularly, near x=0.5, is, surprisingly, the presence of lines of Na ions and vacancies rather than simply maximized Na-Na separations.",

author = "Zandbergen, {H. W.} and M. Foo and Q. Xu and V. Kumar and Cava, {R. J.}",

note = "Funding Information: The work at Princeton University was supported by the NSF, Grant No. DMR 0244254, and the DOE, Grant No. DE-FG02-98-ER45706. The work at Delft was supported by the Nederlandse Stichting voor Fundamenteel Onderzoek der Materie (FOM).",

year = "2004",

month = jul,

doi = "10.1103/PhysRevB.70.024101",

language = "English (US)",

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T1 - Sodium ion ordering in NaxCoO2

T2 - Electron diffraction study

AU - Zandbergen, H. W.

AU - Foo, M.

AU - Xu, Q.

AU - Kumar, V.

AU - Cava, R. J.

N1 - Funding Information: The work at Princeton University was supported by the NSF, Grant No. DMR 0244254, and the DOE, Grant No. DE-FG02-98-ER45706. The work at Delft was supported by the Nederlandse Stichting voor Fundamenteel Onderzoek der Materie (FOM).

PY - 2004/7

Y1 - 2004/7

N2 - The layered sodium cobalt oxide NaxCoO2 is studied by electron diffraction for a wide range of sodium contents, 0.150.5CoO2, which displays Co3+/Co4+ charge ordering at low temperatures. The structural principle for some of the observed ordering schemes, particularly, near x=0.5, is, surprisingly, the presence of lines of Na ions and vacancies rather than simply maximized Na-Na separations.

AB - The layered sodium cobalt oxide NaxCoO2 is studied by electron diffraction for a wide range of sodium contents, 0.150.5CoO2, which displays Co3+/Co4+ charge ordering at low temperatures. The structural principle for some of the observed ordering schemes, particularly, near x=0.5, is, surprisingly, the presence of lines of Na ions and vacancies rather than simply maximized Na-Na separations.

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Sodium ion ordering in Na_xCoO₂: Electron diffraction study

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