Article (Scientific journals)
Modulated misfit structure of the thermoelectric [Bi0.84CaO 2]2[CoO2]1.69 cobalt oxide
Muguerra, H.; Grebille, D.; Guilmeau, E. et al.
2008In Inorganic Chemistry, 47 (7), p. 2464-2471
Peer Reviewed verified by ORBi
 

Files


Full Text
Modulated Misfit Structure of the Thermoelectric [Bi0.84CaO2]2[CoO2]1.69 Cobalt Oxide.pdf
Publisher postprint (316.03 kB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Abstract :
[en] The structure of the thermoelectric lamellar misfit cobalt oxide [Bi 0.84CaO2]2[CoO2]1.69 has been refined using single crystal X-ray diffraction data. Using the four dimensional superspace formalism for aperiodic structures, the superspace group is confirmed P2/m(0δ1/2) (a1 = 4.9069(4), b1 = 4.7135(7), b2 = 2.8256(4), c1 = 14.668(5) Å, β1 = 93.32(1)°). The modulated displacements and site occupancies have been refined and are both compatible with the misfit character of the structure, and with a longitudinal modulation of the Bi-O layers of the structure. This modulation is similar to the corresponding one in the related Sr phase [Bi0.87SrO2]2[CoO2]1.82, but now oriented in the orthogonal direction. Because its incommensurate wavelength is locked with the aperiodicity of the misfit structure, it is possible to distinguish between the modulation parameters induced by the accommodation of both subsystems and those related to the longitudinal modulation of the Bi-O layers. In this original structure, two independent aperiodic phenomena coexist in an single crystallographic direction. A particular attention has been paid to the structural configuration of the CoO2 layer, in relation with other similar phases. The thermoelectric properties are probably directly related to the specific distortion of the compressed layer, but the different measured values for the Seebeck coefficient cannot be related to a significant modification of the CoO6 octahedra. © 2008 American Chemical Society.
Disciplines :
Chemistry
Author, co-author :
Muguerra, H.;  Laboratoire CRISMAT (UMR CNRS 6508), ENSICAEN, 6 Bd Maréchal Juin, 14050 Caen Cedex, France
Grebille, D.;  Laboratoire CRISMAT (UMR CNRS 6508), ENSICAEN, 6 Bd Maréchal Juin, 14050 Caen Cedex, France
Guilmeau, E.;  Laboratoire CRISMAT (UMR CNRS 6508), ENSICAEN, 6 Bd Maréchal Juin, 14050 Caen Cedex, France
Cloots, Rudi ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Language :
English
Title :
Modulated misfit structure of the thermoelectric [Bi0.84CaO 2]2[CoO2]1.69 cobalt oxide
Publication date :
2008
Journal title :
Inorganic Chemistry
ISSN :
0020-1669
eISSN :
1520-510X
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
47
Issue :
7
Pages :
2464-2471
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 23 January 2013

Statistics


Number of views
247 (1 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
22
Scopus citations®
without self-citations
18
OpenCitations
 
24

Bibliography


Similar publications



Contact ORBi