ガラスビード-ファンダメンタルパラメーター法による超電導体 YBa_2Cu_3O_<7-δ> の蛍光 X 線分析

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In the accurate analysis of ceramic powders with few or no available standards by X-ray fluorescence spectrometry, the glass bead technique combined with the Fundamental Parameter (FP) method is suitable. As an example of ceramic powder analysis, we determined Y_2O_3, BaO, and CuO in a superconductor YBa_2Cu_3O_<7-δ> with this combined method. The results obtained were as follows : 1) Satisfactory glass beads with near-infinite thickness to both incident and fluorescent X-rays were found to be prepared from 10 g of Na_2B_4O_7, 1 g of sample, and 0.20 g of potassium iodide. 2) The calculation of the absorption enhancement effects for the YK_α, BaK_α and CuK_α lines got the results below. The YK_α line is more absorbed by substituting Y_2O_3 in the mixed reagents (Y_2O_3-BaO-CuO) with either BaO or CuO. The BaK_α line is enhanced [a little more absorbed] by substituting BaO in the mixed reagents with CuO [Y_2O_3]. The CuK_α line is more absorbed [a little enhanced] by substituting CuO in the mixed reagents with BaO [Y_2O_3]. 3) Y_2O_3, BaO, and CuO in the superconductor were determined with the good accuracies (σ_d′s) of 0.11wt%, 0.18wt%, and 0.19wt%, respectively by the combined method.
1990-04-01