Preparation and structure characteristics of nano-Bi2O3 powders with mixed crystal structure

2005 ◽  
Vol 12 (3) ◽  
pp. 243-245 ◽  
Author(s):  
Wei Li
Keyword(s):  
Crystal Structure ◽  
Mixed Crystal ◽  
Structure Characteristics

The crystal chemistry of (Mn3 +, Fe3+)-substituted andalusites (viridines and kanonaite), (Al1−x−yMn3x+Fe3y+)2 (OǀSiO4): crystal structure refinements, Mössbauer, and polarized optical absorption spectra

1981 ◽  
Vol 155 (1-2) ◽  
Author(s):  
I. Abs-Wurmbach ◽  
K. Langer ◽  
F. Seifert ◽  
E. Tillmanns
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Optical Absorption ◽  
Metal Ions ◽  
Crystal Chemistry ◽  
Mixed Crystal ◽  
Transition Metal Ions ◽  
Structure Type ◽  
Optical Absorption Spectra ◽  
Distorted Octahedral

AbstractThe crystal chemistry of viridines and kanonaite, (AlThe structure refinements reveal that the transition metal ions substitute for Al almost exclusively in the distorted octahedral Al(l) site of the andalusite structure type within the entire mixed crystal series. This is independently proven by the Mössbauer results for

Aluminum Manganese Oxides with Mixed Crystal Structure: High-Energy-Density Cathodes for Rechargeable Sodium Batteries

ChemSusChem ◽  
2014 ◽  
Vol 7 (7) ◽  
pp. 1870-1875 ◽  
Author(s):  
Dong-Wook Han ◽  
Jun-Hwan Ku ◽  
Ryoung-Hee Kim ◽  
Dong-Jin Yun ◽  
Seok-Soo Lee ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Energy Density ◽  
Manganese Oxides ◽  
Mixed Crystal ◽  
High Energy ◽  
High Energy Density ◽  
Sodium Batteries

Approximate model for the crystal structure of precipitates in NaF doped with AlF3

1993 ◽  
Vol 49 (6) ◽  
pp. 846-853 ◽  
Author(s):  
K. Suzuki
Keyword(s):  
Crystal Structure ◽  
Mixed Crystal ◽  
Lattice Structure ◽  
Approximate Model ◽  
Face Centered Cubic ◽  
Cubic Symmetry ◽  
Rotation Axes ◽  
High Form ◽  
Face Centered ◽  
Almost All

The crystal structure of precipitates in a mixed crystal of NaF and 1 mol% AlF3 has been studied at room temperature using both stationary-crystal and rotating-crystal X-ray photographic methods. It has been found that almost all the reflections can be assigned to a face-centered-cubic (f.c.c.) lattice with unit-cell parameter 7.77 Å. The main feature of the diffraction pattern is that the 311 reflection is very strong while the 222 reflection is practically zero, in contrast to the case of high-form cryolite, i.e. cubic Na3AlF6. These features are explained by assuming an f.c.c. arrangement of AlF6 octahedra that are rotated around the 〈111〉 axes by about 47° from the highest-symmetry orientation. It has also been shown that the F ions in each octahedron make large overlaps with the Al ion at the center of the octahedron. A random distribution of rotation axes is also proposed to conform to the cubic symmetry of the lattice structure of the precipitate.

Sign in / Sign up

Export Citation Format

Share Document