Abstract
We have investigated a set of sodium cobaltates (Na x CoO2) samples with various sodium content (0.67 ≤ x ≤ 0.75) using Nuclear Quadrupole Resonance (NQR). The four different stable phases and an intermediate one have been recognized. The NQR spectra of 59Co allowed us to clearly differentiate the pure phase samples which could be easily distinguished from multi-phase samples. Moreover, we have found that keeping samples at room temperature in contact with humid air leads to destruction of the phase purity and loss of sodium content. The high sodium content sample evolves progressively into a mixture of the detected stable phases until it reaches the x = 2/3 composition which appears to be the most stable phase in this part of phase diagram.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. L. Foo, Y. Wang, S. Watauchi, et al., Phys. Rev. Lett. 92, 247001 (2004).
K. Takada, H. Sakurai, E. Takayama-Muromachi, et al., Nature (London) 422, 53 (2003).
J. Wooldridge, D. McK Paul, G. Balakrishnan, and M. R. Lees, J. Phys.: Condens. Matter 17, 70–7718 (2005).
N. B. Ivanova, S. G. Ovchinnikov, M. M. Korshunov, et al., Usp. Fiz. Nauk 179, 837 (2009) [Phys. Usp. 52, 789 (2009)].
C. Julien and G. A. Nazri, Solid State Batteries: Materials Design and Optimization (Kluwer, Boston, 1994).
I. Terasaki, Y. Sasago, and K. Uchinokura, Phys. Rev. B 56, R12685 (1997).
H. D. Bhatt, R. Vedula, S. B. Desu, and G. C. Fralick, Thin Solid Films 350, 249 (1999).
J.-W. Moon, Y. Masuda, W. S. Seo, and K. Koumoto, Mater. Lett. 48, 225 (2001).
G. J. Shu, Andrea Prodi, S. Y. Chu, et al., Phys. Rev. B 76, 184115 (2007).
H. Alloul, I. R. Mukhamedshin, G. Collin, and N. Blanchard, Europhys. Lett. 82, 17002 (2008).
H. Alloul, I. R. Mukhamedshin, T. A. Platova, and A. V. Dooglav, Europhys. Lett. 85, 47006 (2009).
T. A. Platova, I. R. Mukhamedshin, H. Alloul, et al., Phys. Rev. B 80, 224106 (2009).
W. G. Clark, M. E. Hanson, F. Lefloch, and P. Segransan, Rev. Sci. Instrum. 66, 2453 (1995).
A. P. Bussandri and M. J. Zuriaga, J. Magn. Reson. 131, 224 (1998).
I. R. Mukhamedshin, H. Alloul, G. Collin, and N. Blanchard, Phys. Rev. Lett. 93, 167601 (2004).
I. R. Mukhamedshin, H. Alloul, G. Collin, and N. Blanchard, Phys. Rev. Lett. 94, 247602 (2005).
P. Mendels, D. Bono, J. Bobroff, et al., Phys. Rev. Lett. 94, 136403 (2005).
A. T. Boothroyd, R. Coldea, D. A. Tennant, et al., Phys. Rev. Lett. 92, 197201 (2004).
S. P. Bayrakci, I. Mirebeau, P. Bourges, et al., Phys. Rev. Lett. 94, 157205 (2005).
Y. S. Meng, Y. Hinuma, and G. Ceder, J. Chem. Phys. 128, 104708 (2009).
Author information
Authors and Affiliations
Corresponding author
Additional information
The article is published in the original.
Rights and permissions
About this article
Cite this article
Platova, T.A., Mukhamedshin, I.R., Dooglav, A.V. et al. Phase segregation in Na x CoO2 for large Na contents. Jetp Lett. 91, 421–424 (2010). https://doi.org/10.1134/S0021364010080126
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0021364010080126