Low‐Temperature Synthesis of CaZrO3 Powder from Molten Salts

Calcium zirconate (CaZrO 3 ) powder was synthesized using calcium chloride (CaCl 2 ), sodium carbonate (Na 2 CO 3 ), and zirconia (ZrO 2 ) powders. On heating, CaCl 2 reacted with Na 2 CO 3 to form NaCl and CaCO 3 . NaCl–Na 2 CO 3 molten salts provided a liquid reaction medium for the formation of CaZrO 3 from in situ ‐formed CaCO 3 (or CaO) and ZrO 2 . CaZrO 3 started to form at about 700°C, increasing in amount with increasing temperature and reaction time, with a concomitant decrease in CaCO 3 (or CaO) and ZrO 2 contents. After washing with hot‐distilled water, the samples heated for 5 h at 1050°C were single‐phase CaZrO 3 with 0.5–1.0 μm grain size.