Synthesis of Hydrated Praseodymium, Samarium, Gadolinium and Dysprosium Carbonates
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：柳松 马荣骏
文章页码：358 - 361
摘 要：Crystalline hydrated praseodymium, samarium, gadolinium and dysprosium carbonates were synthesized using ammonium bicarbonate as precipitant. The praseodymium, samarium, gadolinium and dysprosium carbonates prepared are hydrated normal carbonates and the structure and properties were investigated by XRD, SEM, TG and IR techniques. The praseodymium carbonate consists of plate shaped crystals, and samarium, gadolinium and dysprosium carbonates consist of spherical aggregates of crystallites. The structure of the praseodymium carbonate is closely related to those of lanthanite type rare earth carbonates, and the structure of the samarium, gadolinium and dysprosium carbonates is closely related to those of tengerite type rare earth carbonates in the literature. The IR data for the praseodymium, samarium, gadolinium and dysprosium carbonates show the presence of two different carbonate groups (bidentate and unidentate carbonates) in the unit cell. In the process of thermal decomposition of the praseodymium, samarium and gadolinium carbonates to oxide, the intermediate phase was detected, but for dysprosium carbonate no stable intermediate was detected.
柳松，马荣骏
摘 要：Crystalline hydrated praseodymium, samarium, gadolinium and dysprosium carbonates were synthesized using ammonium bicarbonate as precipitant. The praseodymium, samarium, gadolinium and dysprosium carbonates prepared are hydrated normal carbonates and the structure and properties were investigated by XRD, SEM, TG and IR techniques. The praseodymium carbonate consists of plate shaped crystals, and samarium, gadolinium and dysprosium carbonates consist of spherical aggregates of crystallites. The structure of the praseodymium carbonate is closely related to those of lanthanite type rare earth carbonates, and the structure of the samarium, gadolinium and dysprosium carbonates is closely related to those of tengerite type rare earth carbonates in the literature. The IR data for the praseodymium, samarium, gadolinium and dysprosium carbonates show the presence of two different carbonate groups (bidentate and unidentate carbonates) in the unit cell. In the process of thermal decomposition of the praseodymium, samarium and gadolinium carbonates to oxide, the intermediate phase was detected, but for dysprosium carbonate no stable intermediate was detected.
关键词：
