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Spectroscopic and magnetic studies of ferric iron hydroxy sulfates: Intensification of color in ferric iron clusters bridged by a single hydroxide ion

Rossman, George R. (1975) Spectroscopic and magnetic studies of ferric iron hydroxy sulfates: Intensification of color in ferric iron clusters bridged by a single hydroxide ion. American Mineralogist, 60 (7-8). pp. 698-704. ISSN 0003-004X. http://resolver.caltech.edu/CaltechAUTHORS:20130430-082926010

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Abstract

Optical and infrared spectroscopic data and magnetic susceptibility data are reported for the ferric hydroxy-sulfate minerals magnesiocopiapite and botryogen and the related mineral coquimbite. The physical properties of intensity of color, pleochroism, and magnetic susceptibility associated with the hydroxobridged Fe^(3+) dimer of magnesiocopiapite and with the hydroxobridged Fe^(3+) infinite chain of botryogen are compared to those of isolated Fe^(3+). The hydroxobridged minerals show strong pleochroism with intensity enhancement of the spin-forbidden ligand field absorption bands occurring when the electric vector of the incident light is oriented in the direction of the Fe-OH-Fe axis. The intensity enhancement and pleochroism are associated with antiferromagnetic exchange coupling of the Fe^(3+) ions.


Item Type:Article
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http://www.minsocam.org/msa/collectors_corner/amtoc/toc1975.htmPublisherUNSPECIFIED
Additional Information:© 1975 Mineralogical Society of America. Manuscript received January 20, 1975; accepted for publication, February 10, 1975. Contribution No. 2518, Division of Geological and Planetary Sciences, California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences2518
Record Number:CaltechAUTHORS:20130430-082926010
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130430-082926010
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38174
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Apr 2013 19:53
Last Modified:30 Apr 2013 19:53

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