Summary
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1.
An investigation was made of the effect of component ratio and thermal treatment conditions on the phase composition and magnetic properties of coprecipitated ferric oxide-alumina gels containing up to 57 mol. percent of
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2.
Gels fired at 400° contained only one crystalline phase, namely, a saturated solid solution of Fe2O3 (8 mol. %@#@) inγ-Al2O3, while those fired at 600 and 750° also contained a solid solution of Al2O3 inα-Fe2O3. Noγ-Fe2O3 was detected either by x-ray diffraction or magnetic methods.
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3.
Fe2O3 reduced the temperature of the phase transition ofγ-Al2O3, in which it was dissolved, toα-Al2O3 and this transition occurred even at 1000°.
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4.
All gels fired at 400°, gels with 7 and 18 mol. % of Fe2O3 fired at 600°, and the gel with 8% of Fe2O3 fired at 750° were paramagnetic and obeyed the Curie-Weiss law with a positive value for the Weiss constant. Their paramagnetism is explained by the formation ofβ-Fe2O3 or more complex transition phases. All the other gels were ferromagnetic.
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5.
Catalytic reactions of isopropyl alcohol on the gels studied at 260–290° led to an increase in the ferromagnetism as a result of the formation of Fe3O4.
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Rubinshtein, A.M., Akimov, V.M. & Slinkin, A.A. Phase composition, structure, and magnetic properties of coprecipitated ferric oxide-alumina gels. Russ Chem Bull 9, 154–162 (1960). https://doi.org/10.1007/BF00942883
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DOI: https://doi.org/10.1007/BF00942883