Abstract
The processes occurring during the synthesis of yttrium hafnate Y2Hf2O7 by solid-phase method using mechanical activation were studied. Mechanoactivation of stoichiometric mixture of yttrium and hafnium oxides was carried out in a laboratory planetary mill AGO-2 at a centrifugal factor of 40 g for 10 min. According to infrared spectroscopy data the processes of hydration and carbonization of samples during mechanical activation due to the absorption of moisture and air carbon dioxide were established. The temperature of dehydration and decarbonization during heat treatment of mechanoactivated oxide mixture was determined. X-ray phase analysis showed that the calcination of mechanoactivated oxide mixture produced Y2Hf2O7 with fluorite structure. The sizes of yttrium hafnate crystallites were calculated using the Scherrer method and were 22 and 94 nm for samples calcined at 1100 and 1200 °C for 3 h, respectively.
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