同时含有稀土元素La、Ce、Pr、Nd的材料的电子探针定量分析方法

Method of Quantitative Electron Probe Microanalysis for Materials Containing La,Ce,Pr and Nd

研制了稀土六硼化物单晶LaB_6、CeB_6、PrB_6和NdB_6电子探针分析标样。根据X-射线峰位表和实测的特征X-射线谱,考察分析了La、Ce、Pr和Nd元素谱线之间的干扰情况,发现分析谱线PrLα_1受到L_αLβ_1线严重的干扰。以混合稀土金属为试样,采用扣除谱线重叠强度的背底非对称测量等方法对L_n、Ce、Pr和Nd进行了电子探针定量分析,其结果与荧光X-射线光谱分析结果符合较好。

The rare earth hexaboride single crystal LAB6, CeB6, PrB6 and NdB6 standard specimens have been prepared and examined, their surface behaviour, composition homogeneity and stability completely meet the specification of electron probe microanalysis standard specimen. The characteristic X-rays, which serve as analysis spectrum lines in quantitative microprobe analysis, have been checked and selected from the table of x-ray wavelength detecting position (L-value) of.element and the measured characteristic x-ray spectra of the RE elements in the mischmetal specimen. It has been found that the x-ray line Prlal is subject to the serious interference caused by the x-ray line LaL!31, hence it is necessary to subtract the imposing interference intensity of LaL[31 on the line PrLal. The pro-cedures of subtracting the interference intensity and the non-symmetric background measurement have been em- ployed to obtain the accurate quantitative analysis. The results of analysis on La, Ce, Pr and Nd in the mischmetal specimen satisfactorily accord with those of fluorescence x-ray analysis.