Magnetic Behavior of Basic Iron (III) Compounds: I. Magnetic Behavior of the Basic Iron Sulfates and Basic Iron Chromates. II. Magnetic Behavior of Delta Ferric Oxide Hydroxide

Citation

Powers, Dana Auburn (1975) Magnetic Behavior of Basic Iron (III) Compounds: I. Magnetic Behavior of the Basic Iron Sulfates and Basic Iron Chromates. II. Magnetic Behavior of Delta Ferric Oxide Hydroxide. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/0P1Q-WM72. https://resolver.caltech.edu/CaltechTHESIS:02112015-085855387

Abstract

I. The thermomagnetic behavior and infrared spectroscopic features of KFe₃(SO₄)₂(OH)₆ (jarosite), (H₃O)Fe₃(SO₄)₂ (OH)₆ (hydronium jarosite), KFe₃(CrO₄)₂ (OH)₆, Fe(OH)SO₄ (basic iron sulfate), and Fe(OH)CrO₄ (basic iron chromate) are reported. Fe(OH)CrO₄ and KFe₃(CrO₄)₂ (OH)₆ are shown to be weak ferro magnets with Curie temperatures of 73 and 71 °K, respectively. This unusual magnetic behavior is rationalized in terms of the ionic spin configurations of the phases. Exchange coupling through chromate bridging groups is shown to be weak.

II. The magnetic behavior and the influence of preparative history on the magnetic behavior of δFeO(OH) is reported. δFeO(OH) is shown to be a fine-particulate, uniaxial, magnetic species. Magnetization data for this species are shown to be consistent with the existence of magnetically inactive layers surrounding magnetic particles.

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