Further data on solid solutions in ZrO₂-TiO₂ system

Conclusions

It was confirmed that the compound ZrTiO₄ and two types of solid solutions are formed in the system ZrO₂-TiO₂.

The beginning of the interaction between ZrO₂ and TiO₂ is noticed at 1200° after 30 hours.

The solid solution of the distorted fluorite type is marked by a eduction in the monoclinic zirconium dioxide lattice parameters. The formation of a solution does not hamper the polymorphous transitions of the zirconium dioxide. The solid solution of the rutile type in the TiO₂ region is marked by an increase in the parameters of the titanium dioxide elementary cells. No polymorphous transitions of the ZrO₂ were noticed in these solid solutions.

The addition of titanium dioxide shifts the polymorphous transition from 1050° in the case of pure zirconium dioxide to 600° in the specimen with an addition of 40–50 mole % TiO₂.

The solid solutions of the rutile series as well as the compound ZrTiO₄ show equal thermal expansion, and despite the high porosity which they maintain up to 1700° may be put to practical use.

The solid solutions of the zirconium series, containing up to 15, TiO₂, show sharp volumetric changes during the polymorphous transition and cannot be used for producing parts on account of this.