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

Author: Powers, Dana Auburn

Year: 1975

Degree: Dissertation (Ph.D.)

Advisor: Gray, Harry B.

Committee Member: Unknown, Unknown

Option: Chemistry; Chemical Engineering; Economics

DOI: 10.7907/0P1Q-WM72

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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