Activity Measurements of Components at Dilution in Alloys by Isopiestic Cell-Atomic Absorption Spectrometry Combination

采用原子吸收分光光度计结合等静力池测定合金中各组分的活性。在固定电池窗口温度的情况下，通过在不同温度下加热电池中的纯元素，得到一条校准曲线，然后使用该曲线将合金样品的吸光度转换为电池中的蒸气压。通过计算纯元素蒸气的平均自由程和吸光度随温度的变化，验证了等静压细胞-原子吸收光谱仪组合在蒸气压测量中的适用性。采用等温池测定了In-Sb（1100K）、Ga-Sb（1100K）、Sb-Pb（1130K）、Pb-Au（1130K）、Bi-Pb（833K）、In-Pb（1110K）和Ga-Pb（1120K）体系的组分活性。结果在会议上公布如下：尹,Z.H.、Nakazawa年代。Azakami, T。：“熔融合金的原子吸收光谱热力学研究(1)-熔融Ga-Pb和in - pb合金中的组分活性”，韩国金属学会秋季会议，1989.10.28.2。尹,Z.H.、Nakazawa年代。Azakami, T。：“熔融合金的原子吸收光谱热力学研究(2)——熔融Bi-Pb和Sb-Pb合金中的组分活性”，韩国金属学会秋季会议，1989.10.28.3。尹,Z.H.、Nakazawa年代。Azakami, T。：“原子吸收光谱法测定Ga-Sb和In-Sb体系的活度”，日本金属研究所春季会议，1990.4.4。为了对背景吸收进行校正，提出了一种新的方法。该方法在低吸光度条件下尤其有效。

An isopiestic cell was combined with an atomic absorption spectrophotometer to determine the activities of the components in alloys. By heating a pure element in the cell at different temperatures, whereas the cell window temperature being fixed, a calibration curve is obtained and then the curve is used to convert the absorbance measured for the alloy sample to the vapor pressure in the cell. The applicability of the isopiestic cell-atomic absorption spectrometer combination to vapor pressure measurements was examined by referring to the estimated mean free paths and the measured absorbances for pure element vapors as a function of temperature.An isothermal cell was used to determine the component activities for the system In-Sb(1100K), Ga-Sb(1100K), Sb-Pb(1130K), Pb-Au(1130K), Bi-Pb(833K), In-Pb(1110K), and Ga-Pb(1120K). The results were published at the meetings as follows:1. Yoon,Z.H., Nakazawa,S. and Azakami,T.: "Thermodynamic Study on Molten Alloys by Atomic Absorption Spectrometry(1)-Component Activities in Molten Ga-Pb and In-Pb Alloys-", Fall Meeting of Korean Institute of Metals, 1989.10.28.2. Yoon,Z.H., Nakazawa,S. and Azakami,T.: "Thermodynamic Study on Molten Alloys by Atomic Absorption Spectrometry(2)-Component Activities in Molten Bi-Pb and Sb-Pb Alloys- ", Fall Meeting of Korean Institute of Metals, 1989.10.28.3. Yoon,Z.H., Nakazawa,S. and Azakami,T.: "Activity Measurements for the Ga-Sb and In-Sb Systems by Atomic Absorption Spectrometry", Spring Meeting of Japan Institute of Metals, 1990.4.4.To make the correction concerned with back-ground absorption a new method was invented. The method is effective especially in a low-absorbance condition.