Löslichkeit von Nickel-Zink-Ferriten in Säuren |
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Authors: | Irena Okońska-Kozlowska |
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Institution: | 1. Institut für Physik der Schleischen Universit?t Katowice, Polen
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Abstract: | Dissolution of zinc and nickel ferrites were previously found2,3 to conform to the equations: $$\frac{{dx}}{{dt}} = ks_0 \left( {1 - x} \right)^3 K = \frac{1}{t}\left {\frac{1}{{\left( {1 - x} \right)^2 }} - 1} \right]$$ x-solubility (%),t=time (min),s 0=initial specific surface (m 2·g?1),k-rate constant independent of specific surface,K=apparent rate constant dependent on specific surface (min?1). The aim of this work was to check the applicability of these equations to the dissolution of nickel—zinc ferrites. The experimental results obtained for 3 mixed ferrites (Ni0.3Zn0.7Fe2O4, Ni0.5Zn0.5Fe2O4, Ni0.7Zn0.3Fe2O4) revealed that kinetics of their dissolution in HCl, HNO3 and their mixtures also conform to the equations stated above. |
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