【摘要】 以Ca（NO₃）₂·4H₂O,Mn（NO₃）₂为初始原料,利用溶胶凝胶法制备了CaMnO₃前驱物溶胶,在不同干燥工艺条件下得到各类干凝胶前驱物,经煅烧得到CaMnO₃多晶粉末。研究了不同干燥工艺对制备CaMnO₃粉末的影响,并利用XRD、SEM、TEM、激光粒度分析仪等表征手段分析了所得粉末。结果表明,多温区连续升温干燥工艺有利于得到完全脱水的干凝胶前驱物,其中以90℃+120℃+140℃+160℃连续加热干燥工艺方式最佳,所得干凝胶前驱物经950℃煅烧后能够得到结晶性良好,颗粒较为均匀且形貌规则的CaMnO₃多晶粉末,多晶颗粒体由单晶区域组成,各单晶取向不同。更多还原

【Abstract】 The gel of precursor of CaMnO₃ was prepared by sol-gel method using Ca（NO₃）₂·4H₂O,Mn（NO₃）₂ as raw materials.All kinds of dry gel precursors were obtained under different drying conditions,and then the CaMnO₃ polycrystalline powders were obtained by calcining the dry gel.The effects of different drying processes on the preparation of CaMnO₃ powder were studied,and the obtained powders were characterized by XRD,SEM,TEM and laser particle size analyzer.The results show that the continuous heating step at various drying temperatures is beneficial to obtaining a dry gel precursor with complete dehydration.The drying process of 90°C+120°C+140°C+160°C is the best among the four processes.The CaMnO₃ polycrystalline powder with good crystallinity,uniform particles and regular morphology is obtained after calcining the dry gel at 950°C,and the CaMnO₃ polycrystalline particles are composed of single-crystals with different orientations.更多还原