Calcium zirconate (CaZrO3) powder was synthesized using calcium chloride (CaCl2), sodium carbonate (Na2CO3), and zirconia (ZrO2) powders. On heating, CaCl2 reacted with Na2CO3 to form NaCl and CaCO3. NaCl-Na2CO3 molten salts provided a liquid reaction medium for the formation of CaZrO3 from in situ-formed CaCO3 (or CaO) and ZrO2. CaZrO3 started to form at about 700 degrees C, increasing in amount with increasing temperature and reaction time, with a concomitant decrease in CaCO3 (or CaO) and ZrO2 contents. After washing with hot-distilled water, the samples heated for 5 h at 1050 degrees C were single-phase CaZrO3 with 0.5-1.0 mu m grain size.