TY - JOUR
T1 - Lithia distribution in infiltrated silica gels
AU - Le Bars, Nathalie
AU - Klein, L. C.
N1 - Funding Information:
Financial support from the Center for Ceramics Research, a New Jersey Commission on Science and Technology Center, is appreciated, along with a grant from Atochem (NL).
PY - 1990/8/1
Y1 - 1990/8/1
N2 - Silica gels were prepared by mixing colloidal silica with potassium silicate in a 1:9 weight ratio. Following ion exchange to remove Na and K, the highly porous samples were soaked in methanolic LiOH or aqueous LiNO3 solutions. The influence of the soaking time was determined for LiOH solutions. The influence of solution concentration was determined for LiNO3 solutions. Bulk concentrations of Li were increased by increasing the soaking time in LiOH solutions and increasing the solution concentration in LiNO3 solutions. Once bulk compositions of about 15 mol% Li2O-85 mol% SiO2 were achieved, the distribution of Li in the sample was evaluated by dissolving the samples in HF. In all cases, the distribution of Li in the dried samples was not uniform. The Li content was negligible in the middle of the sample. Only in the case of LiNO3 samples was the chemical uniformity improved by heat treatment at 200°C for 1 h.
AB - Silica gels were prepared by mixing colloidal silica with potassium silicate in a 1:9 weight ratio. Following ion exchange to remove Na and K, the highly porous samples were soaked in methanolic LiOH or aqueous LiNO3 solutions. The influence of the soaking time was determined for LiOH solutions. The influence of solution concentration was determined for LiNO3 solutions. Bulk concentrations of Li were increased by increasing the soaking time in LiOH solutions and increasing the solution concentration in LiNO3 solutions. Once bulk compositions of about 15 mol% Li2O-85 mol% SiO2 were achieved, the distribution of Li in the sample was evaluated by dissolving the samples in HF. In all cases, the distribution of Li in the dried samples was not uniform. The Li content was negligible in the middle of the sample. Only in the case of LiNO3 samples was the chemical uniformity improved by heat treatment at 200°C for 1 h.
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U2 - 10.1016/0022-3093(90)90994-W
DO - 10.1016/0022-3093(90)90994-W
M3 - Article
AN - SCOPUS:0025470473
SN - 0022-3093
VL - 122
SP - 291
EP - 297
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 3
ER -