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- W2035432884 abstract "Oxygen partial pressure equilibria of MnZn ferrites are determined by thermogravimetry for compositions of 51 and 53 mol% Fe2O3 with different Mn, Zn proportions. The temperature ranges from 900 to 1400°C and the atmosphere varies from 0.001 to 100% O2. It is shown that the isocomposition lines on lg (Po2) versus 1/T diagrams are parallel for all compositions. The curves lg (Po2) versus Fe2+ wt% exhibit a marked difference for compositions with the same Fe content and different Mn, Zn proportions. It is deduced from these results that Mn must be taken into account for the redox mechanism in the MnZn ferrites. Evidence is given that ferrite may be metastable at room temperature. Die Sauerstoffpartialdrücke von Ferriten der Zusammensetzungen 51 und 53 Mol% Fe2O3 mit verschiedenen Mn/Zn-Verhältnissen werden durch Thermogravimetrie bestimmt. Die Gleichgewichtslinien mit konstantem Analysenwert laufen von 900 bis 1400°C und von 0.001% bis 100% O2-Atomosphäre. Es wird gezeigt, daß die Neigung der geraden Linien des Diagramms lg (Po2) = f(1/T) für alle geprüften MnZn-Ferrite gleich ist. Die Kurven lg (Po2) = g (Fe2+) zeigen abweichende Sauerstoffpartialdrücke für denselben Fe-Gehalt und verschiedene Mn/Zn-Verhältnisse. Diese Ergebnisse lassen erkennen, daß der Mn-Gehalt berücksichtigt werden muß, um den Oxydation–Reduktions-Mechanismus quantitativ zu erklären. Die Lage der Phasengrenze weist auf einen metastabilen Zustand des MnZn-Ferrits bei Raumtemperatur hin." @default.
- W2035432884 created "2016-06-24" @default.
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- W2035432884 date "1973-11-16" @default.
- W2035432884 modified "2023-09-25" @default.
- W2035432884 title "Oxygen partial pressures of MnZn ferrites" @default.
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- W2035432884 doi "https://doi.org/10.1002/pssa.2210200139" @default.
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