Abstract: (18520 Views)
Well crystallized pure calcium zirconate (CaZrO3
) nanopowder was successfully synthesized using the
molten-salt method. CaCl2
, Na
2CO3, micro-ZrO
2and nano-ZrO
2
were used as starting materials. On heating, Na2CO3
reacted with CaCl
2to form NaCl and CaCO
3. Nano CaZrO
3
was formed by reacting equimolar amounts of in situformed CaCO
3 (or CaO) and ZrO
2
in molten Na
2CO3-NaCl eutectic mixture. CaZrO
3
particle size and synthesis
temparture was tailored as a function of ZrO
2particle size. Due to the usage of nano-ZrO
2
, the molten salt synthesis
(MSS) temperature was decreased and possible impurity phases in the final product were suppressed. The synthesis
temperature was lowered to 800°C and soaking time of the optimal synthesis condition was reduced to 3h. After
washing with hot-distilled water, the n-ZrO2sample heated at 800°C for 3h, was single phase CaZrO
3with 70-90 nm
in particle size, while the m-ZrO
2sample heated at 1000°C for 3h, was single phase CaZrO
3
with 250-400 nm in
particle size. Based on the TEM observation and thermodynamic analysis, the synthesized CaZrO
3
grains retained the
morphology of the ZrO2
nanopowders, which indicated that a template formation mechanism play a dominant role in
synthesis process
Type of Study:
Research Paper |