Local order structure and surface acidity properties of a Nb2O5/SiO2 mixed oxide prepared by the sol–gel processing method

2004 ◽  
Vol 177 (7) ◽  
pp. 2432-2439 ◽  
Author(s):  
Maria Suzana P Francisco ◽  
Richard Landers ◽  
Yoshitaka Gushikem
Keyword(s):  
Mixed Oxide ◽  
Surface Acidity ◽  
Sol Gel ◽  
Processing Method ◽  
Local Order ◽  
Order Structure ◽  
Gel Processing

scholarly journals The Li+, Na+ and K+ ion exchange reaction process on the surface of mixed oxide SiO2/TiO2/Sb2O5 surface prepared by the sol-gel processing method

2005 ◽  
Vol 30 (1) ◽  
pp. 51-58 ◽  
Author(s):  
C. U. Ferreira ◽  
J. E. Gonçalves ◽  
Y. V. Kholin ◽  
Y. Gushikem
Keyword(s):  
Ion Exchange ◽  
Mixed Oxide ◽  
Exchange Process ◽  
Sol Gel ◽  
Exchange Capacity ◽  
Processing Method ◽  
Exchange Property ◽  
Ion Exchange Process ◽  
Ion Exchange Reaction ◽  
Gel Processing

The porous mixed oxide SiO2/TiO2/Sb2O5 obtained by the sol-gel processing method presented a good ion exchange property and a high exchange capacity towards the Li+, Na+ and K+ ions. In the H+/M+ ion exchange process, the H+ / Na+ could be described as presenting an ideal character. The ion exchange equilibria of Li+ and K+ were quantitatively described with the help of the model of fixed tetradentate centers. The results of simulation evidence that for the H+ / Li+ exchange the usual situation takes place: the affinity of the material to the Li+ ions is decreased with increasing the degree of ion exchange. On the contrary, for K+ the effects of positive cooperativity, that facilitate the H+ / K+ exchange, were revealed.

scholarly journals Adsorption of hidrogen peroxide on the surface of silica - titania mixed oxide obtained by the sol-gel processing method

2007 ◽  
Vol 32 (2) ◽  
pp. 41-45 ◽  
Author(s):  
J. E. Gonçalves ◽  
U.P. R. Filho ◽  
D.W. Franco ◽  
Y. Gushikem
Keyword(s):  
Mixed Oxide ◽  
Sol Gel ◽  
Processing Method ◽  
Gel Processing

Sol-gel processing of varistor powders

1992 ◽  
Vol 7 (3) ◽  
pp. 546-548 ◽  
Author(s):  
Gert Hohenberger ◽  
Gerhard Tomandl
Keyword(s):  
Grain Boundaries ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Homogeneous Distribution ◽  
Electrical Behavior ◽  
Gel Method ◽  
Sol Gel Method ◽  
Zno Varistor ◽  
Gel Processing ◽  
Source Materials

A new sol-gel method for the preparation of ZnO varistor powders, using inexpensive source materials such as acetates and nitrates, is described. It yields powders with a more homogeneous distribution of dopants compared to the commercially used mixed oxide technique. Varistor ceramics made from sol-gel powders can be sintered at lower temperatures and show improved electrical behavior. This is a consequence of formation of more varistor-active grain boundaries within the ceramics.

Preparation of alumina gels by a non-hydrolytic sol-gel processing method

1994 ◽  
Vol 170 (3) ◽  
pp. 234-242 ◽  
Author(s):  
S. Acosta ◽  
R.J.P. Corriu ◽  
D. Leclercq ◽  
P. Lefèvre ◽  
P.H. Mutin ◽  
...  
Keyword(s):  
Sol Gel ◽  
Processing Method ◽  
Alumina Gels ◽  
Gel Processing

Novel route for the epitaxial growth of (SrBa)Nb2O6 thick films by the sol-gel method using a self-template layer

2001 ◽  
Vol 16 (11) ◽  
pp. 3179-3183 ◽  
Author(s):  
A-D. Li ◽  
C. L. Mak ◽  
K. H. Wong ◽  
D. Wu ◽  
Naiben Ming
Keyword(s):  
Sol Gel ◽  
Pulsed Laser ◽  
Processing Method ◽  
Laser Deposition ◽  
Morphological Properties ◽  
Promising Technique ◽  
High Quality ◽  
Homoepitaxial Growth ◽  
Device Applications ◽  
Gel Processing

A novel sol-gel processing method has been developed to fabricate epitaxial (SrBa)Nb2O6 (SBN) thin films on MgO substrates. It involves the introduction of a SBN self-template layer on MgO by pulsed laser deposition (PLD). Effects of the SBN self-template layer on the structural and morphological properties of the sol-gel-derived SBN films were investigated. Compared to the sol-gel-derived SBN films without a self-template layer, our new technique produces SBN films of excellent epitaxy and more dense grains with uniform distribution. This can be explained by the self-template-layer-induced homoepitaxial growth. The innovative processing method with combination of PLD and sol-gel is a promising technique in preparing high-quality, thick epitaxial SBN films for electro-optics device applications.

Sign in / Sign up

Export Citation Format

Share Document