Synthesis and Characterization of Ruteno-Cuprates by Solid State Reactions

2008 ◽  
Vol 591-593 ◽  
pp. 644-648
Author(s):  
J.M.A. Gimenez ◽  
Carlos Roberto Grandini ◽  
A.R. Jurelo
Keyword(s):  
Solid State ◽  
Low Temperatures ◽  
Magnetic Transition ◽  
Solid State Reactions ◽  
Synthesis And Characterization ◽  
Superconducting Properties ◽  
New Class ◽  
Preparation Conditions ◽  
Magnetic States

A new class of hybrid ruteno-cuprates – such as Ru-1212 and Ru-1222 – was discovered in 1995 by Bauerfeind and collaborators. These materials present superconducting and magnetic states at low temperatures, an atypical duality in other superconductors. The superconductivity is more easily observed in Ru-1222, while Ru-1212 is a more problematic case, due to the strong effects of the preparation details in its superconducting properties, becoming the material superconductor or not. Ru-1212 presents a critical temperature that can vary between 0 and 46 K, depending on the preparation conditions, and a temperature of magnetic transition of around 132 K. The samples were prepared through solid state reactions, by using a mixture of high purity powders, followed by calcination and sinterization in the nitrogen and oxygen atmospheres. This paper shows the preparation process of Ru-1212 samples, followed by their structural and magnetic characterization.

Synthesis and Characterization of T12Ba2CaCu2O8 and T12Ba2Ca2Cu3O10

1989 ◽  
Vol 169 ◽  
Author(s):  
Lauren E. H. McMills ◽  
Shu Li ◽  
Zhen Zhang ◽  
Martha Greenblatt
Keyword(s):  
Magnetic Susceptibility ◽  
Powder Diffraction ◽  
Single Phase ◽  
Synthesis And Characterization ◽  
Synthetic Method ◽  
Superconducting Properties ◽  
X Ray ◽  
Preparation Conditions ◽  
The Relationship

AbstractSingle-phase samples of T12Ba2CaCu2O8 and T12Ba2Ca2Cu3O10 have been prepared using a reliable and simple synthetic method. Samples were characterized by x-ray powder diffraction, magnetic susceptibility and four probe resistivity methods. The TcR=0 values for T12Ba2CaCu2O8 ranged from 100 to 105K, whereas those for T12Ba2Ca2Cu3O10 ranged from 96 to 107K. The relationship between the superconducting properties and the various preparation conditions are discussed.

Synthesis and Characterization of Metal Silicide/Silicon Carbide Composites by Low Temperature Solid-State Reactions

1993 ◽  
Vol 322 ◽  
Author(s):  
D. Zeng ◽  
M. J. Hampden-Smith ◽  
L.-M. Wang
Keyword(s):  
Silicon Carbide ◽  
Solid State ◽  
Thermal Treatment ◽  
Low Temperature ◽  
Thermal Annealing ◽  
Solid State Reactions ◽  
Synthesis And Characterization ◽  
Metal Silicide ◽  
Co Reduction

AbstractCo-reduction of mixtures of MoCl3(THF)3 and SiCls4 in THF using Li/C10H8 or both Li/C10Hs8 and LiBEt3H resulted in formation and separation of black powders which upon thermal annealing at temperatures ranging from 750°C to 1 100°C produced crystalline molybdenum silicide and silicon carbide composite. Co-reduction of mixtures of WCI4 and GeBr4 with LiBEt3H in THF formed W2C and elemental Ge which upon thermal treatment at 750°C for 4 hours generated a small amount of crystalline W5Ge3.

Synthesis and Characterization of Barium Titanate by Solid-State Reaction

2014 ◽  
Vol 802 ◽  
pp. 285-290 ◽  
Author(s):  
Mônica C. de Andrade ◽  
Geysa N. Carneiro ◽  
Elizabeth L. Moreira ◽  
Jorge C. Araújo ◽  
Valéria C.A. Moraes
Keyword(s):  
Solid State ◽  
Barium Titanate ◽  
Solid State Reactions ◽  
Synthesis And Characterization ◽  
Temperature Influence ◽  
X Ray Diffraction ◽  
X Ray ◽  
Refinement Method ◽  
Doped Barium Titanate

Solid-state reactions were used to synthesize pure and doped barium titanate powder. Barium titanate formation with tetragonal perovskite structure was detected by X-ray diffraction and occurred at a temperature above 700°C for pure powder and 500°C for doped powder. However, quite crystalline samples were observed only at 800oC and 600°C for pure and doped barium titanate, respectively, what made the refinement of the synthesized powders possible. They were characterized by X-ray diffraction and Fourier transform infrared spectroscopy and scanning electron microscopy. X-ray diffraction data was analyzed by using the Fullprof Rietveld refinement approach, Thompson-Cox-Hastings pseudo-Voigt with function. The refinement method was effective in the study of the temperature influence on the microstructure of the analysis of pure and doped barium titanate.

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