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- W2041709956 abstract "Zinc ferrite ZnO.Fe2O3 was found to be almost non‐magnetic, the magnetic critical temperature being very low. The critical temperature of Fe3O4 is nearly 600° C., and that of magnetic Fe2O3 is a little above 500° C. The critical temperatures of the specimens (black in color) made by heating the mixture ZnO.Fe2O3 + n Fe3O4 in vacuo at 1,000° C. changed with the value of n when determined in vacuo, that is, they were not identical with that of Fe3O4. The critical temperatures of the mixtures that were employed were also determined in air and found to be almost independent of n, and almost equal to that of the magnetic Fe2O3. Fe3O4 in this mixture is oxidized in air much more rapidly than is Fe3O4 alone. The magnetic powers (not the critical temperatures) of the black specimens and of the reddish brown specimens were nearly proportional to the excess of iron oxide. On the basis of the above results the authors conclude that: The specimens which were made by heating the mixtures ZnO. Fe2O3 + n Fe3O4 and ZnO.Fe2O3 + Fe2O3 above 950° C. (in vacuo or in air) and by then cooling them in vacuo or by quenching them, owe their magnetization to Fe3O4 existing in solid solution, and that the magnetic power of the reddish brown specimens, which were made by heating the mixtures ZnO.Fe2O3 + Fe2O3 above 950° C, and by then cooling them in the air, was due to the presence of magnetic Fe2O3 forming a separate phase. Specimens which were made originally by quenching or by cooling the heated mixtures in vacuo, and which were then reheated in air up to 500° C., likewise became magnetic, owing to the presence of magnetic Fe2O3." @default.
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- W2041709956 date "1930-01-01" @default.
- W2041709956 modified "2023-09-27" @default.
- W2041709956 title "Studies on Zinc Ferrite. Its Formation, Composition, and Chemical and Magnetic Properties" @default.
- W2041709956 doi "https://doi.org/10.1149/1.3492161" @default.
- W2041709956 hasPublicationYear "1930" @default.
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