Preparation of CaZrO3 powders by a microwave–assisted molten salt method

摘要

CaZrO₃ powders were synthesized by a combined molten salt and microwave heating technique, i.e., microwave–assisted molten salt synthesis (MMSS) technique, using ZrO₂ and CaCl₂ as the main raw materials, and molten LiCl and Na₂CO₃ as a reaction medium. Phase pure CaZrO₃ powders can be synthesized at 900°C for 3 h by using the MMSS method. This synthesis temperature was at least 100°C lower than that required by the conventional molten salt synthesis method. Microstructures and phase compositions of as-prepared CaZrO₃ powders were examined by field emission–scanning electron microscopy (FE–SEM) and transmission electron microscope (TEM), revealing that the crystalline size of the as-prepared CaZrO₃ powders was about 100–300 nm, and the “template formation” mechanism played a dominant role in the synthesis process of MMSS.