Study of intercalation and deintercalation of Na_xCoO_2 yH_2O single crystals

Details Study of intercalation and deintercalation of Na_xCoO_2 yH_2O single crystals Study of intercalation and deintercalation of Na_xCoO_2 yH_2O single crystals

2004-07-03

arxiv.org/abs/cond-mat/0407086v2

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 6 figures, figures with higher resolution by email request from the corresponding author

Scientific paper

10.1016/j.jcrysgro.2004.12.021

Single crystals of NaxCoO2 with beta-phase (x=0.55, 0.60 and 0.65), alpha'-phase (x=0.75) and alpha-phase (x=0.9, 1.0) have been grown by the floating zone technique. The Na-extraction and hydration were carried out for the alpha'-sample to get superconducting phase of NaxCoO2.yH2O (x~0.3, y~1.3). Hydrated single crystals exhibit cracked layers perpendicular to the c-axis due to a large expansion when the water is inserted into the structure. A study of intercalation/deintercalation was performed to determine the stability of the hydrated phase and effects of hydration on the structure of the compound. X-ray diffraction and Thermogravimetric experiments are used to monitor the process of water molecules accommodated in and removed from the crystal lattice. The initial intercalation process takes place with two-water molecules corresponding to y=0.6) inserted in a formula unit, followed by a group of four (y=1.3) to form a cluster of Na(H2O)4. Thermogravimetric analysis suggests that the deintercalation occurs with the removal of the water molecules one by one from the hydrated cluster at elevated temperatures of approximately 50, 100, 200 and 300 C, respectively. Our investigations reveal that the hydration process is dynamic and that water molecule inter- and deintercalation follow different reaction paths in an irreversible way.

Affiliated with

Also associated with

No associations

Rating

Study of intercalation and deintercalation of Na_xCoO_2 yH_2O single crystals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Study of intercalation and deintercalation of Na_xCoO_2 yH_2O single crystals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of intercalation and deintercalation of Na_xCoO_2 yH_2O single crystals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-603227