醇盐法制备稀土化合物超微粉末

PREPARATION OF ULTRAFINE POWDERS OF RARE EARTH COMPOUNDS BY ALCOXIDE METHOD

稀土元素具有广泛的用途,在大多数的应用中其效果都与原料的纯度、粒度、粒经分布范围等因素有关。由于超微粉末的比表面积大、化学活性高,因此可以预料,若将稀土化合物制成超微粉末,会使它的催化性能及在各种材料中的性能有明显的改变,也可使稀土有新的、更高的应用价值。

Ultrafine powders of hydroxides and oxides of thirteen rare earths have been praparedby alcoxide method. The size of the powder particle was less than 0.05μm by TEM observa-tion. The powders obtained from Jight rare earths are different in shapes from those fromheavy rare earths and are easier to be dispersed. XRD determination showed that the ultra-fine powders of some rare earth hydroxides are crystalline, while the powders of the oxidesare all crystalline.