微波水热-固相法制备钙铁石型Ca_2Fe_2O_5粉体及其表征

Microwave-hydrothermal-sintering synthesis and characterization of Ca_2Fe_2O_5

以硝酸铁和硝酸钙为原料,草酸铵作为络合剂,用氨水调节pH,采用微波水热-固相法制备钙铁石型Ca2Fe2O5粉体.利用XRD和SEM对产物的物相和微观形貌进行表征,结果表明:微波水热预处理后得到的CaCO3-Fe2O3复合氧化物,颗粒度小,反应活性较高,在700℃下焙烧3h便可制备正交晶系的Ca2Fe2O5粉体.

Ca2Fe2O5 powder were prepared by microwave hydrothermal-sintering method with iron nitrate and calcium nitrate as raw materials,ammonium oxalate as a complexing agent,adjusting the pH with ammonia.The prepared powders were characterized by X-ray diffraction（XRD） and SEM,the results show that the microwave hydrothermal treatment made a fine CaCO3-Fe2O3 complex oxide,which possesses high ratio surface area and high surface energy.And hence,the Ca2Fe2O5 powder of orthorhombic can be prepared by calcining the as synthesized CaCO3-Fe2O3 complex oxide at 700 ℃ for 3 h.