Magnetic fluctuation and pairing instability controlled by the CoO6 distortion in the sodium cobalt oxide

In this work, a sodium-cobalt oxide (NaxCo2O4) ceramic composite nanofiber was manufactured through electrospinning. The response of the fiber to external electromagnetic field was characterized to observe the heat generation in the fiber. In addition, we also measured the current passing through the fiber under the polarization of DC potential. It is found that the fiber has intensive heating behavior when it is exposed to the electromagnetic field. The temperature increases more than 5 degrees in Celsius scale only after 5 s exposure. The current – potential curve of the fiber reveals its dielectric behavior. It is concluded that this ceramic fiber has the potential to be used for hyperthermia treatment in biomedical engineering or for energy conversions.

Download Full-text

The Role of Sodium-Rich Pretreatments in the Enhanced Sintering of Sodium Cobalt Oxide Thermoelectric Ceramics

Proceedings of the 11th European Conference on Thermoelectrics ◽

10.1007/978-3-319-07332-3_5 ◽

2014 ◽

pp. 37-42

Author(s):

E. M. Jakubczyk ◽

C. L. Sansom ◽

R. A. Dorey

Keyword(s):

Cobalt Oxide ◽

Sodium Cobalt Oxide

Download Full-text

ChemInform Abstract: Hydration of Sodium Cobalt Oxide.

ChemInform ◽

10.1002/chin.200809015 ◽

2008 ◽

Vol 39 (9) ◽

Author(s):

Hiroya Sakurai ◽

Minoru Osada ◽

Eiji Takayama-Muromachi

Keyword(s):

Cobalt Oxide ◽

Sodium Cobalt Oxide

Download Full-text

Thermoelectric characterization of multi-walled carbon nanotube/ Sodium cobalt oxide prepared by a low-cost flame sintering technique

Ceramics International ◽

10.1016/j.ceramint.2017.09.123 ◽

2017 ◽

Vol 43 (18) ◽

pp. 17086-17092 ◽

Cited By ~ 3

Author(s):

Chutima Oopathump ◽

On-Uma Kheowan ◽

Anek Charoenphakdee ◽

Adul Harnwunggmoung ◽

Siwaporn M. Smith ◽

...

Keyword(s):

Carbon Nanotube ◽

Cobalt Oxide ◽

Low Cost ◽

Multi Walled Carbon Nanotube ◽

Sodium Cobalt Oxide

Download Full-text

Structural difference between a superconducting sodium cobalt oxide and its related phase

Journal of Solid State Chemistry ◽

10.1016/s0022-4596(03)00336-0 ◽

2004 ◽

Vol 177 (1) ◽

pp. 372-376 ◽

Cited By ~ 45

Author(s):

Kazunori Takada ◽

Hiroya Sakurai ◽

Eiji Takayama-Muromachi ◽

Fujio Izumi ◽

Ruben A. Dilanian ◽

...

Keyword(s):

Cobalt Oxide ◽

Structural Difference ◽

Sodium Cobalt Oxide ◽

Related Phase

Download Full-text

2 × 2 Superstructure in Sodium Cobalt Oxide Superconductors

Chemistry of Materials ◽

10.1021/cm8031237 ◽

2009 ◽

Vol 21 (15) ◽

pp. 3693-3700 ◽

Cited By ~ 7

Author(s):

Kazunori Takada ◽

Mitsuko Onoda ◽

Yong-Nam Choi ◽

Dimitri N. Argyriou ◽

Fujio Izumi ◽

...

Keyword(s):

Cobalt Oxide ◽

Oxide Superconductors ◽

Sodium Cobalt Oxide

Download Full-text

Synthesis of Three Layer NaxCoO2 (x=0.3, 0.5, 0.6, 0.75, 1.0) and Superconductivity in Three Layer Na0.3CoO2•1.3H2O

MRS Proceedings ◽

10.1557/proc-848-ff6.11 ◽

2004 ◽

Vol 848 ◽

Author(s):

M.L. Foo ◽

T. Klimczuk ◽

L. Li ◽

N.P. Ong ◽

R.J. Cava ◽

...

Keyword(s):

Solid State ◽

Cobalt Oxide ◽

Room Temperature ◽

Solid State Synthesis ◽

Stacking Sequence ◽

Sodium Cobalt Oxide ◽

Conventional Solid State Synthesis

ABSTRACTThe synthesis of three layer sodium cobalt oxide, NaxCoO2 (x=0.3, 0.5, 0.6, 0.75 and 1.0) is reported. For x=0.6, 0.75, and 1.0, conventional solid-state synthesis was employed. x=0.3 and 0.5 were obtained via oxidative deintercalation of sodium at room temperature. x=0.3 can be hydrated to Na0.3CoO2•1.3H2O which is superconducting with a Tc of 4.3 K. Although having the same chemical stiochiometry as the previously reported two layer superconductor, it has a different stacking sequence of CoO2 layers making it structurally distinct. Crystals of three layer NaCoO2 show triangular morphology compared to hexagonal morphology for two layer Na0.7CoO2.

Download Full-text

Hydration of Sodium Cobalt Oxide

Chemistry of Materials ◽

10.1021/cm0714786 ◽

2007 ◽

Vol 19 (25) ◽

pp. 6073-6076 ◽

Cited By ~ 10

Author(s):

Hiroya Sakurai ◽

Minoru Osada ◽

Eiji Takayama-Muromachi

Keyword(s):

Cobalt Oxide ◽

Sodium Cobalt Oxide

Download Full-text

Electronic structure of sodium cobalt oxide: Comparing mono- and bilayer hydrate

Physical Review B ◽

10.1103/physrevb.71.132503 ◽

2005 ◽

Vol 71 (13) ◽

Cited By ~ 15

Author(s):

Ryotaro Arita

Keyword(s):

Electronic Structure ◽

Cobalt Oxide ◽

Sodium Cobalt Oxide

Download Full-text

Synthesis and Characterization of CoO2 Nanosheets

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.177.5 ◽

2010 ◽

Vol 177 ◽

pp. 5-8 ◽

Cited By ~ 2

Author(s):

Cai Xia Li ◽

Hai Fang Xu ◽

Tao Feng ◽

Na Zhang ◽

Qiang Li

Keyword(s):

Cobalt Oxide ◽

Colloidal Suspension ◽

Ammonium Hydroxide ◽

X Ray Diffraction ◽

Transmission Electron ◽

Tetrabutyl Ammonium ◽

Vis Spectroscopy ◽

Sodium Cobalt Oxide ◽

Negative Surface ◽

Negative Surface Charge

The layered sodium cobalt oxide Na0.6CoO2 phase has been synthesized from Na2O2 and Co3O4 by solid-state reaction at 550°C for 12h with the heating rate about 2°C /min. The colloidal suspension of exfoliated, layered cobalt oxide nanosheets was prepared through the intercalation of tetrabutyl ammonium hydroxide ions (TBA) into protonated sodium cobalt oxide. The as-obtained composites were analyzed by powder X-ray diffraction (XRD). They were also cross-confirmed by a range of methods including UV/Vis spectroscopy, and Transmission Electron Microscopy (TEM). The Zeta-potential measurements clearly demonstrated the negative surface charge of cobalt oxide nanosheets.

Download Full-text