TY - JOUR
T1 - Effect of Ti concentration on the structure and texture of SiTiOC glasses
AU - Téllez, L.
AU - Rubio, J.
AU - Valenzuela, M. A.
AU - Rubio, F.
AU - Oteo, J. L.
N1 - Funding Information:
This work was supported and made possible by a CICYT project ref. MAT99-1158 of Spain.
Funding Information:
L. Téllez is grateful to the Consejo Nacional de Ciencia y Tecnología (CONACyT) of México under the grant ref. 72432.
PY - 2009/6
Y1 - 2009/6
N2 - Five different silicon-titanium organic-inorganic hybrid materials were prepared by the reaction of tetraethoxysilane, titanium tetrabutoxide and silanol-terminated polydimethylsiloxane. Si-Ti oxycarbide glasses were prepared by pyrolysis of the hybrid materials in nitrogen atmosphere in the range of 400 to 1500 °C. The obtained Si-Ti oxycarbide materials were characterized by Fourier Transform-Infra Red spectroscopy, X-ray-diffraction, mercury porosimetry and SEM. The study indicated that the reactivity towards water increases up to 1000 °C, at higher temperatures it decreases for all samples. During the pyrolysis, Ti atoms were incorporated into the silicate network leading to the formation of Si-Ti oxycarbide glasses, except with sample containing 7% of Ti which presented also the formation of β-SiC and TiC crystalline phases. The porosity was increased up to 600 °C and then decreased tending to disappear at 1500 °C. When the titanium concentration increased from 1 to 3% in the oxycarbide glass, the porosity decreased; for higher concentration, an increase in the porosity was observed.
AB - Five different silicon-titanium organic-inorganic hybrid materials were prepared by the reaction of tetraethoxysilane, titanium tetrabutoxide and silanol-terminated polydimethylsiloxane. Si-Ti oxycarbide glasses were prepared by pyrolysis of the hybrid materials in nitrogen atmosphere in the range of 400 to 1500 °C. The obtained Si-Ti oxycarbide materials were characterized by Fourier Transform-Infra Red spectroscopy, X-ray-diffraction, mercury porosimetry and SEM. The study indicated that the reactivity towards water increases up to 1000 °C, at higher temperatures it decreases for all samples. During the pyrolysis, Ti atoms were incorporated into the silicate network leading to the formation of Si-Ti oxycarbide glasses, except with sample containing 7% of Ti which presented also the formation of β-SiC and TiC crystalline phases. The porosity was increased up to 600 °C and then decreased tending to disappear at 1500 °C. When the titanium concentration increased from 1 to 3% in the oxycarbide glass, the porosity decreased; for higher concentration, an increase in the porosity was observed.
KW - Si-Ti oxycarbide glasses
KW - Sol-gel process
KW - Structure
KW - Texture
UR - http://www.scopus.com/inward/record.url?scp=63549149165&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2008.12.013
DO - 10.1016/j.matchar.2008.12.013
M3 - Artículo
SN - 1044-5803
VL - 60
SP - 506
EP - 512
JO - Materials Characterization
JF - Materials Characterization
IS - 6
ER -