酸化物超伝導関連物質Li_xKCa_2Na_2Nb_5O_<16>の誘導結合プラズマ発光分光分析のための試料分解法

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Proper dissolution procedures for perovskite-type niobium oxide compounds were investigated for an elemental determination in inductively coupled plasma-optical emission spectrometry (ICP-OES). Niobium oxide compounds are usually decomposed by using several kinds of fluxes. However, flux compounds, such as sodium disulfate (Na_2S_2O_7) and potassium hydrogensulfate (KHSO_4), are not employed for Li_xKCa_2Na_2Nb_5O_<16> , because these fluxes contain sodium or potassium. This paper describes a new dissolution method with au acid mixture that is suitable for the analysis of Li_xKCa_2Na_2Nb_5O_<16> samples by ICP-OES. The samples were not decomposed with H_2SO_4 only nor with HF-HNO_3. However, they were able to decompose with an acid mixture of HF-HNO_3-H_2SO_4. Also, in a microwave-assisted dissolution method, the samples were completely decomposed only when a ternary acid mixture was employed.
2004-02-05