Divacancy superstructures in thermoelectric calcium-doped sodium cobaltate - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2014

Divacancy superstructures in thermoelectric calcium-doped sodium cobaltate

Abstract

We have grown single crystals of NaxCayCoO2 and determined their superstructures as a function of composition using neutron and x-ray diffraction. Inclusion of Ca 2+ stabilises a single superstructure across a wide range of temperatures and concentrations. The superstructure in the Na + layers is based on arrays of divacancy clusters with Ca 2+ ions occupying the central site, and it has an ideal concentration Na 4/7 Ca 1/7 CoO2. Previous measurements of the thermoelectric properties on this system are discussed in light of this superstructure. Na 4/7 Ca 1/7 CoO2 corresponds to the maximum in thermoelectric performance of this system.
Fichier principal
Vignette du fichier
1505.02635v1.pdf (3.03 Mo) Télécharger le fichier
Origin Files produced by the author(s)
Loading...

Dates and versions

cea-01376304 , version 1 (04-10-2016)

Identifiers

Cite

D. Porter, M. Roger, M. J. Gutmann, S. Uthayakumar, D. Prabhakaran, et al.. Divacancy superstructures in thermoelectric calcium-doped sodium cobaltate. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90, pp.054101. ⟨10.1103/PhysRevB.90.054101⟩. ⟨cea-01376304⟩
28 View
102 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More