Milling assisted synthesis of calcium zirconate СаZrО3

• CaZrO3 has been synthesized by two-step synthesis process.
• Monoclinic ZrO2 and CaCO3 (calcite) have been used as reagents.
• Milling has been performed in AGO-2 planetary ball mill for up to 10 min.
• Interphase area considerably increases during co-milling of the reagents.
• Nanocrystalline CaZrO3 is produced by heating of the milled mixture at 950 °C.

Monophase calcium zirconate (CaZrO3) has been prepared from the equimolar ZrO2 + CaCO3 mixture by two-step synthesis process. In the first step, mechanical treatment of the mixture is performed in an AGO-2 planetary ball mill. In the second step, the milled mixture is annealed to form calcium zirconate. High-energy ball milling of the (ZrO2+CaCO3) mixture results in decrease in the temperature of CaZrO3 formation during annealing at 950 °C. The enhancement of CaZrO3 synthesis is due to accumulation of excess energy by the reagents, decreasing the particle size and notable increase in the interphase area because of “smearing” of CaCO3 on ZrO2 particles during milling. Nanocrystalline calcium zirconate has been produced by controlling the annealing temperature and time.

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