氧化锆瓷珠对麦羟硅钠石结晶的影响

Influence of Zirconia Ceramic Beads on the Crystallization of Magadiite

以瓷珠表面作为晶化的成核介质,通过水热晶化法合成了麦羟硅钠石。分别研究了无瓷珠时和有瓷珠时,麦羟硅钠石晶化过程的形态演变及成核机理。结果表明：瓷珠表面对麦羟硅钠石的晶化过程有异相成核作用,形成了不同的中间态,缩短了晶化时间。无瓷珠时,晶化过程中无定型SiO2团状物先从中间晶化成层片状晶体,再向边缘拓展,最终形成玫瑰花瓣状层片状麦羟硅钠石晶体;当加入瓷珠时,晶化过程中无定型SiO2团状物先在瓷珠表面的不同点逐渐形成多个片状物,片状物上继续晶化,形成片状物且层层紧密叠加,最后进一步晶化形成玫瑰花瓣状麦羟硅钠石晶体。

Magadiite was prepared by a hydrothermal synthesis method when zirconia ceramic beads were used as an inorganic nucleating medium in the crystallization process. The morphological evolution and synthesis mechanism of magadiite without and with the inorganic nucleating medium were discussed. The results show that the ceramic beads as the medium have a heterogeneous nucleation effect, leading to an intermediate state during the crystallization of magadiite and shortening the crystallization time. In the absence of the ceramic beads, the lamellar crystals of amorphous SiO2 from the middle to the edge are formed, and finally magadiite with rose petals-like lamellar crystals is obtained. In the presence of the ceramic beads, the platelets of amorphous SiO2 are firstly crystallized on the bead surface, and then the flaky objects are grown in platelets, stacked tightly and finally crystallized to magadiite.