Activities of NiO, FeO, and O in silicate melts |
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| Authors: | Russell O Colson AM Floden TR Haugen KM Malum M Sawarynski MKB Nermoe KE Jacobs D Holder |
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| Institution: | Department of Anthropology and Earth Science, Minnesota State University Moorhead, Moorhead, MN 56563, USA |
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| Abstract: | We have measured activity coefficients for NiO and FeO in a variety of silicate melts (SiO2-CaO-MgO-Al2O3) using electrochemical methods similar to square wave voltametry. We report the activity of the oxide ion (aO2−) in one composition. Based on these measurements, we have constructed a model that predicts the variations in activity we observe, and also variations in NiO activity reported in the literature. Activity of metal-oxide components such as NiO and FeO in silicate melts can be understood by considering contributions from both the activity of the oxide ion and the activity of the cation through expressions of the type:
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