石墨炉内石墨探针表面原子化机理的研究Ⅳ.硝酸铕的原子化机理

Atomization Mechanism of Europium Nitrate on Graphite Probe Surface in Graphite Furnace

用X-射线衍射分析与X-射线光电子能谱分析研究了硝酸铕在石墨炉内石墨探针表面原子化机理.研究结果表明,在硝酸铕的原子化过程中,Eu(NO_3)_3先转化Eu_2O_3,生成的Eu_2O_3经一系列的晶型转变之后,热分解为EuO(s),后者以EuO(g)形式蒸发进入气相.硝酸铕的原子化起源于EuO(g)的热分解.在1660K和1920K时有铕的碳化物EuC_2生成.

The atomization mechanism of europium nitrate on graphite probe surface in graphite furnace was investigated experimentally by X-ray diffraction spectrometry and X-ray photoelectron spectrometry. It shows that in the course of atomization, the samples of europium nitrate firstly decomposed into Eu3O3(s), and then converted into EuO(s) via transformation of different cryctalline type of Eu2O3(s). EuO(s) vaporizes into gaseous phaseas EuO(g), and the atomization of europium nitrate originates from the thermal decomposition of EuO(g). EuC2 was identified at 1660 and 1920 K.but its role played in the course of atomization of europium nitrate is unclear.