Preparation and physical properties of amorphous V2O5 containing TiO2, Na2O or Li2O |
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Authors: | Hiroshi Hirashima Seiji Kamimura Reiki Muratake and Tetsuro Yoshida |
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Institution: | Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi, Kohoku-ku, Yokohama, 223, Japan |
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Abstract: | V2O5 gels containing up to 18 mol% of TiO2 were obtained through the simultaneous hydrolysis of alkoxides in ethanol solution. V2O5 gels containing Na2O or Li2O were obtained through the ion exchange method. The crystallization temperature, Tcr, of the gels increased and the H2O content of the gels decreased by the addition of TiO2 or Na2O. These additives seem to stabilize the amorphous state of the gels. On the other hand, Tcr and the H2O-content slightly varied with the addition of Li2O. No ionic polarization was observed in coating films of the gels dried at temperatures below Tcr. The dc conductivity of the films was anisotropic, and increased with the addition of Li2O or Na2O. However, it decreased with increasing TiO2 content. The fiber-like structure of gels was observed by TEM. The gels obtained from alkoxides were thin and short in comparison with the gels obtained through the ion exchange method. |
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