2017. - V. 31. - N 10(191). - P. 64-66
S.V. Chizhevskaya, A.V. Zhukov, A.D. Evstigneeva,
The effect of fluoride ion additives (up to 10% by weight) on the freshly precipitated and "old" zirconium hydroxides on the content of metastable tetragonal zirconium dioxide at 500 and 600⁰С in the products of their heat treatment is studied. It was shown that the addition of F- up to 5% by weight to the "old" hydroxide (with a small amount of hydroxo-groups) slightly reduces the metastable t-ZrO2 content at 500⁰C and significantly increases its content in the case of freshly precipitated hydroxide. Additions of F- to the "old" hydroxide reduce the metastable t-ZrO2 content at 600°C and lead to the appearance of freshly precipitated hydroxide in the products of heat treatment along with the KF phases of hepta- and hexafluorozirconate of potassium.
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