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

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.

scholarly journals Mechanochemically-Assisted Synthesis of Lead-Free Piezoelectric CaZrO3-Modified (K,Na,Li)(Nb,Ta)O3-Solid Solution

Ceramics ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 304-318 ◽  
Author(s):  
Kristian Radan ◽  
Brigita Kmet ◽  
Silvo Drnovšek ◽  
Uroš Prah ◽  
Tadej Rojac ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Solid State ◽  
Processing Time ◽  
Piezoelectric Properties ◽  
Mechanochemical Activation ◽  
Solid State Synthesis ◽  
Lead Free ◽  
Compositional Homogeneity ◽  
Lower Temperature ◽  
Conventional Solid State Synthesis

Lead-free piezoelectric 0.95(Na0.49K0.49Li0.02)(Nb0.8Ta0.2)O3–0.05CaZrO3 with 2 wt % MnO2 addition was prepared using mechanochemically-assisted solid-state synthesis. Upon mechanochemical activation of the mixture of reagents partial amorphization occurs which contributes to a significantly lower temperature of completion of the solid-state reaction, ~600 °C as opposed to ~700 °C for the conventional solid-state synthesis as determined by thermal analysis. The ceramic specimens prepared by the mechanochemically-assisted route exhibit improved compositional homogeneity and slightly enhanced piezoelectric properties, achieved in a considerably shorter processing time compared to the conventional solid-state synthesis route, which was studied as a reference.

Solid-state synthesis of amorphous iron(III) phosphate at room temperature and its absorption properties for Hg(II) and Ag(I) ions

2007 ◽  
Vol 61 (17) ◽  
pp. 3755-3757 ◽  
Author(s):  
Ping Yin ◽  
Yucai Hu ◽  
Yanzhi Sun ◽  
Yingxia Yang ◽  
Chunnuan Ji ◽  
...  
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Solid State Synthesis ◽  
Absorption Properties ◽  
Amorphous Iron

Solid-state Synthesis of Aryl 2-Nitrophenyl Ureas

2003 ◽  
Vol 2003 (4) ◽  
pp. 220-221 ◽  
Author(s):  
Jing Li ◽  
Yu-lu Wang ◽  
Ting Sun
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Solid State Synthesis ◽  
First Time

A simple and efficient solid-state synthesis for aryl 2-nitrophenyl ureas at room temperature is described for the first time.

Microwave-assisted solid-state synthesis of hydroxyapatite nanorods at room temperature

2005 ◽  
Vol 40 (23) ◽  
pp. 6311-6313 ◽  
Author(s):  
Jie Ming Cao ◽  
Jie Feng ◽  
Shao Gao Deng ◽  
Xin Chang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Solid State Synthesis ◽  
Microwave Assisted

Room Temperature Solid-State Synthesis of a Conductive Polymer for Applications in Stable I2-Free Dye-Sensitized Solar Cells

ChemSusChem ◽  
2012 ◽  
Vol 5 (11) ◽  
pp. 2173-2180 ◽  
Author(s):  
Byeonggwan Kim ◽  
Jong Kwan Koh ◽  
Jeonghun Kim ◽  
Won Seok Chi ◽  
Jong Hak Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solid State ◽  
Room Temperature ◽  
Dye Sensitized Solar Cells ◽  
Conductive Polymer ◽  
Solid State Synthesis ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Supersonic gas flow impacting approach for solid-state synthesis at room-temperature: Temperature measurement

2020 ◽  
Vol 34 (14n16) ◽  
pp. 2040100
Author(s):  
Qiuting Guo ◽  
Zheng Guo ◽  
Yang Tao ◽  
Zhao Zhang ◽  
Jun Lin ◽  
...  
Keyword(s):  
Solid State ◽  
Kinetic Energy ◽  
Gas Flow ◽  
Room Temperature ◽  
Solid Particles ◽  
Solid State Synthesis ◽  
Average Particle ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Supersonic Gas Flow

Solid-state synthesis based on supersonic gas flow impingement at room-temperature is an alternative approach to traditional mechanochemical preparation. The supersonic airflow is generated by a convergent-diffusion nozzle with a design Mach number of 3.0. The solid material particles from the suction pipe in the coaxial nozzle can get very high kinetic energy in microseconds. Then the particles impact the target or collide with each other to achieve the transfer of kinetic energy to thermal or chemical energy. We utilize the infrared technology to successfully measure the solid particles’ temperature while they impact the target after gathered energy from the supersonic air gas. The results show that the average temperature of the silicon particles with an average particle diameter of 150 [Formula: see text]m after impacting the target is about [Formula: see text]C, and some of the temperature exceed [Formula: see text]C. It dedicates that the kinetic energy of the particles during the collision translate into internal energy indeed. The work of this paper lays a good foundation for further research on the low-temperature solid-phase reaction processes.

Sign in / Sign up

Export Citation Format

Share Document