TY - JOUR
T1 - Influence of solution composition on the formation of SiO2/LaF3 composites in the sol-gel process
AU - Fujihara, S.
AU - Kato, T.
AU - Kimura, T.
N1 - Funding Information:
S. Fujihara thanks Nippon Sheet Glass Foundation for Materials Science and Engineering (20th, 1998) for their financial support.
PY - 2000
Y1 - 2000
N2 - Influence of starting solution composition on the formation of SiO2/LaF3 composites was examined in the sol-gel process of tetramethylorthosilicate, methanol, water and N,N-dimethylformamide. Trifluoroacetic acid (TFA) and lanthanum acetate were used as chemical sources for LaF3. Microcrystals of LaF3 with a size of 10 nm were formed in silica matrix by heating dried gels above 300°C. Colorization, crack formation and fragmentation during drying and heating gels were greatly dependent on the amount of TFA. It was possible to suppress fragmentation of the heated gels by using lanthanum trifluoroacetate gels as precursor in preparing the starting solutions.
AB - Influence of starting solution composition on the formation of SiO2/LaF3 composites was examined in the sol-gel process of tetramethylorthosilicate, methanol, water and N,N-dimethylformamide. Trifluoroacetic acid (TFA) and lanthanum acetate were used as chemical sources for LaF3. Microcrystals of LaF3 with a size of 10 nm were formed in silica matrix by heating dried gels above 300°C. Colorization, crack formation and fragmentation during drying and heating gels were greatly dependent on the amount of TFA. It was possible to suppress fragmentation of the heated gels by using lanthanum trifluoroacetate gels as precursor in preparing the starting solutions.
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U2 - 10.1023/A:1004726630820
DO - 10.1023/A:1004726630820
M3 - Article
AN - SCOPUS:0033738149
SN - 0022-2461
VL - 35
SP - 2763
EP - 2767
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 11
ER -