Abstract
Sodium titanium dioxide bronze is oxidized into a white and nonstoichiometric compound isostructural with itself by being heated upto about 890 K in air. The oxidation means that dioxide bronze converts into a sodium titanate with only a tetravelent state for the Ti ion, retaining the Na x TiO 2-type structure. The conversion is accompanied by a shrinkage in unit cell volume and a decrease in density. Vegard's law is clearly applicable to the lattice parameters of the oxidized form as well as the dioxide bronze, and the extrapolation of the composition dependency curves of the oxidized form gives the lattice parameters of the new TiO 2 polymorph (R. Marchand, L. Brohan, and M. Tournoux, Mater. Res. Bull. 15, 1129 (1980)). The oxygen uptake also shows a composition dependency proportional to sodium content, and the observed amounts are about 16% less than the theoretical values or a half of Na or Ti 3+ content in the ideal chemical formula of Na x Ti 3+ x Ti 4+ 8− x O 16. This difference will be discussed on the basis of the estimated chemical formulae of these two phases.
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