Effect of colloidal drying process on preparation of CaMnO3 powder

Abstract:

The gel was prepared by sol-gel method using metal nitrate as raw materials. All kinds of dry gel precursors were obtained under different drying conditions, then the CaMnO3 polycrystalline powders were obtained by calcinating the dry gel. This paper studies the effects of different drying processes on preparation of CaMnO3 powder, and the obtained powders were characterized by XRD, SEM, TEM and laser particle size analyzer. The results show that the continuous heating step for various drying temperatures is beneficial to obtain dry gel precursor with complete dehydration.The drying process of 90℃+120℃+140℃+160℃ is the best among the four processes. The CaMnO3 polycrystalline powder with good crystallinity, uniform particles and regular morphology was obtained after calcining the dry gel at 950℃, the CaMnO3 polycrystalline particles were composed by single-crystals with different orientations.